Influence of nozzle size on deformation performance Reasonable design

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  • Experimental Characterization of the Influence of Nozzle ...

    2019-4-1 · This paper experimentally observed at a small level the influence of nozzle temperature change on warping deformation (WD), dimensional Accuracy (DA) and density. The materials chosen are pure PLA and advanced PLA+ specimens of rectangular shape of 63.5 mm × 9.53 mm × 3.2 mm produced by the end-user 3D printer based on fused deposition modeling (FDM).

    Get Price
  • Influence of nozzle exit tip thickness on the performance ...

    2010-3-25 · The influence of exit tip thickness of nozzle δ e on the flow field and performance of a jet pump was studied numerically in this paper. It is found that δ e has influence on the distribution of turbulence kinetic energy k.If δ e is ignored, k takes the highest value but dissipates rapidly than that of nozzle with a certain tip thickness. δ e also affect apparently the development of tip ...

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  • Investigating the influence of the jet from three nozzle ...

    2018-10-25 · Investigating the influence of the jet from three nozzle and spear design configurations on Pelton runner performance by numerical simulation S Petley1, A Panagiotopoulos1 2, D S Benzon3, A Židonis1, G A Aggidis1, J S Anagnostopoulos2, D E Papantonis2 1 Lancaster University Renewable Energy Group and Fluid Machinery Group,

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  • Influence of nozzle diameter on soot evolution in ...

    2018-8-1 · The fuel stream comprised 41.7% ethylene (C 2 H 4) and 58.3% nitrogen (N 2), by volume.The fuel was diluted to limit the maximum amount of soot in the forced flame and thus minimise the level of interference from soot to the laser diagnostic measurements .For all the studied cases, the volumetric flow rates of the fuel stream and the co-flow were kept constant at …

    Get Price
  • Numerical study for the influences of primary nozzle on ...

    2016-8-5 · The influences of primary nozzle on the performance of steam ejectors were investigated numerically, and the effects of the primary nozzle outlet diameter as well as the divergent section length under different entrained stream pressures on the steam ejector were analyzed and discussed.

    Get Price
  • (PDF) Influence of Nozzle-to-Surface Distance Ratio and ...

    Influence of Nozzle-to-Surface Distance Ratio and Reynolds Number Variation on Hemispherical Tempered Glass Strength and Quench Time March 2017 The …

    Get Price
  • Effect of Nozzle Geometry and Distance on Cooling ...

    The aperture ratio of the nozzle was defined as the ratio of the nozzle opening area and the area to be cooled for one nozzle. In the slit nozzle, a 25A carbon steel pipe with a thickness of 3.2 mm was used for the nozzle header, and a round holes with a size of ϕ3.2 mm were made at a span of 5.6 mm. In the staggered arrangement nozzle, a long ...

    Get Price
  • Effects of dimensional size and surface roughness on ...

    2017-3-23 · Nozzle size is determined by its field of application, even though large scale nozzle performance is more sensitive than that of micro nozzles to the variation of relative roughness. For a conventional macro scale nozzle, it is easy to use mechanical cutting operations to meet the surface roughness technical requirements.

    Get Price
  • (PDF) INFLUENCE OF APEX ANGLE AND NOZZLE DESIGN ON

    A CFD model was developed to understand the effects of water jet apex angle, and nozzle design on droplet dynamics, energy and momentum transfer, and particle size control.

    Get Price
  • Deformation Analysis of Reinforced Retaining Wall Using ...

    In order to reveal the main factors affecting the deformation of reinforced soil retaining wall and the influence of various factors on the deformation, the constitutive relation is discretized into four aspects of soil, geogrid, wall panel, and contact surface, and discrete element matrices are, respectively, constructed, with the method of separate finite element.

    Get Price
  • Influence of nozzle diameter on soot evolution in ...

    2018-8-1 · The fuel stream comprised 41.7% ethylene (C 2 H 4) and 58.3% nitrogen (N 2), by volume.The fuel was diluted to limit the maximum amount of soot in the forced flame and thus minimise the level of interference from soot to the laser diagnostic measurements .For all the studied cases, the volumetric flow rates of the fuel stream and the co-flow were kept constant at …

    Get Price
  • Investigating the influence of the jet from three nozzle ...

    2019-7-15 · Investigating the influence of the jet from three nozzle and spear design configurations on Pelton runner performance by numerical simulation S Petley1, A Panagiotopoulos1 2, D S Benzon3, A Židonis1, G A Aggidis1, J S Anagnostopoulos2, D E Papantonis2 1 Lancaster University Renewable Energy Group and Fluid Machinery Group,

    Get Price
  • Numerical study for the influences of primary nozzle on ...

    2016-8-5 · The influences of primary nozzle on the performance of steam ejectors were investigated numerically, and the effects of the primary nozzle outlet diameter as well as the divergent section length under different entrained stream pressures on the steam ejector were analyzed and discussed.

    Get Price
  • Review of stability of liquid jets and the influence of ...

    1974-1-1 · 1974-1-1 · The Chemical Engineering Journal, 7 (1974) 1-20 cOElsevier Sequoia S.A., Lausanne. Printed in the Netherlands Review of Stability of Liquid Jets and the Influence of Nozzle Design M. J. MeCARTHY Central Research Laboratories, The B.H.P. Co. Ltd., Shortland, N.S.W. 2307 (Australia) N. A. MOLLOY Department of Metallurgy, University of Newcastle, N.S.W. 2308 …

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  • (PDF) INFLUENCE OF APEX ANGLE AND NOZZLE DESIGN ON

    A CFD model was developed to understand the effects of water jet apex angle, and nozzle design on droplet dynamics, energy and momentum transfer, and particle size control.

    Get Price
  • Effects of dimensional size and surface roughness on ...

    2017-3-23 · Nozzle size is determined by its field of application, even though large scale nozzle performance is more sensitive than that of micro nozzles to the variation of relative roughness. For a conventional macro scale nozzle, it is easy to use mechanical cutting operations to meet the surface roughness technical requirements.

    Get Price
  • Study on optimization of nozzle for copper-aluminium clad ...

    2021-1-1 · The casting-rolling production lasts for a long time, and the casting nozzle should ensure the reasonable splitting of the internal cavity while contacting the high-temperature aluminum liquid for a long time [, , ]. The rational design of the nozzle structure is a necessary condition for the smooth progress of casting-rolling.

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  • Influence of MAX-Phase Deformability on Coating Formation ...

    2020-11-8 · As solid-state deposition technique avoiding oxidation, cold gas spraying is capable of retaining feedstock material properties in the coatings, but typically fails to build up coatings of brittle materials. Ceramic MAX phases show partial deformability in particular lattice directions and may thus successfully deposit in cold spraying. However, deformation mechanisms under high …

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  • Influence of Plastic Deformation Capacity on Failure ...

    2018-3-2 · 2018-3-2 · It is well known that the plastic deformation capacity can significantly affect the failure behavior of pipelines. As such, yield-to-tensile ratio, uniform elongation and strain hardening exponent have been recognized as important parameters in material specification and selection, structural design and integrity assessment [].The reasonable critical plastic deformation …

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  • The influence of ice-based fixture on suppressing ...

    2021-7-28 · Thin-walled parts are widely used in aerospace, auto industry, and other fields. It has been shown that during the machining process, due to the low rigidity, thin workpieces will generate undesirable machining-induced deformation [1, 2], and eventually lead to non-uniform thickness and poor surface quality [3,4,5], which has a bad effect on the service performance and life of …

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  • Experimental Characterization of the Influence of Nozzle ...

    2019-4-1 · This paper experimentally observed at a small level the influence of nozzle temperature change on warping deformation (WD), dimensional Accuracy (DA) and density. The materials chosen are pure PLA and advanced PLA+ specimens of rectangular shape of 63.5 mm × 9.53 mm × 3.2 mm produced by the end-user 3D printer based on fused deposition modeling (FDM).

    Get Price
  • Design of powder nozzle for high resource efficiency in ...

    Works have been conducted to obtain improvements in nozzle design [60, 61], analyses of the nozzle flow behaviour [45,62], or compare the efficiency of different types [45,52]. ...

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  • New Contour Design Method for Rocket Nozzle of Large Area ...

    A rocket engine for space propulsion usually has a nozzle of a large exit area ratio. The nozzle efficiency is greatly affected by the nozzle contour. This paper analysed the effect of the constant capacity ratio in Rao’s method through the design process of an apogee engine. The calculation results show that increasing the heat capacity ratio can produce an expansion contour of smaller ...

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  • Effect of structural forms on the performance of a jet ...

    2015-4-7 · the jet pump. The study found that the influence of area ratio has the largest influence. The parameters have an optimum value scope when the jet pump area ratio is fixed .In recent research, the performance of jet pump has improved by the new type of nozzle structure including multiple, impulse nozzles, adjustable nozzles and annular jet pump.

    Get Price
  • Influence of nozzle temperature and volumetric filling on ...

    In addition, the present study investigates the influence of the filling degree (50 % or 100 %) and the nozzle temperature during manufacturing on the mechanical properties of 3D-printed poly ...

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  • Measurement and Control Simulation and experimental ...

    2021-3-18 · influence of four-channel coaxial nozzle flow field Shi Rui Guo , Qian Qian Yin, Lu Jun Cui, Xiao Lei Li, Ying Hao Cui, Bo Zheng, Yan Long Cao and Wen Han Zeng Abstract This paper investigates the influence of carrier gas flow on the external flow field of coaxial powder feeding nozzle. FLUENT software was adopted to establish gas-solid two ...

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  • Performance optimization of SiC piezoresistive pressure ...

    2021-1-5 · Silicon carbide is considered as a more suitable material for piezoresistive pressure sensors in a high-temperature environment due to its excellent characteristics. In this paper, fundamental research on the structural design of SiC piezoresistive pressure sensors was carried out through the finite element method (FEM) to accurately estimate the optimal output …

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  • Influence of Journal Misalignment Caused by Shaft ...

    2005-4-1 · Friction coefficient of journal slightly changes. Therefore, in order to make the calculation of journal bearing more realistic and to achieve more reasonable design in shaft-bearing system, the influence of shaft deformation under load should be considered in lubrication analysis of journal bearing in a shaft-bearing system.

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  • Reasonable thickness design of expressway pavement ...

    2019-9-29 · The effect of the treatment has been recognized by designers in the industry. 1 –3 However, factors such as lime treatment, roadbed depth, and reasonable thickness of each layer of pavement structure have great influence on the pavement stress and strain design index. 4 –6 So far, little research has been conducted on the relationship ...

    Get Price
  • Frontiers of Mechanical Engineering

    2021-6-9 · In this work, a mathematical model is developed to describe the relationships among functional performance, design configurations and parameters, and design parameter uncertainties. A multi-level optimization model is established to identify: (1) The optimal design configuration, (2) the optimal values of design parameters, and (3) the boundaries of functional performance …

    Get Price
  • Effect of structural forms on the performance of a jet ...

    2015-4-7 · the jet pump. The study found that the influence of area ratio has the largest influence. The parameters have an optimum value scope when the jet pump area ratio is fixed .In recent research, the performance of jet pump has improved by the new type of nozzle structure including multiple, impulse nozzles, adjustable nozzles and annular jet pump.

    Get Price
  • Determination of nozzle loads to facilitate the initial ...

    2018-10-26 · I n pressure vessel design, use this procedure for determining the individual permissible flange loads for joints between pressure vessel nozzles and connected pipework. At the initial design stage of pressure vessels with nozzles that are provided with standard flanges according to ASME B16.5 or ASME B16.47 Series A, the layout (routing) of piping connecting to the nozzles …

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  • Analysis of droplet stability after ejection from an ...

    It is noted that the viscosity effect causes a viscous loss at the nozzle and requires more energy from the pressure pulse to generate the droplets with a certain velocity. Figure 8 illustrates the influence of surface tension on the ejection process. Surface tension is a key factor affecting the shape of the initial droplet and the deformation ...

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  • Mechanical Characteristics and Optimum Design of SMW ...

    Increasing the size of the flange and web of the section steel had little effect on the deformation of the foundation pit. The flange was sensitive to the deformation of the supporting structure because it was on the stressed side. The different layout forms of the steel section exerted a great influence on the deformation of the foundation pit.

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  • Injection Mold Design Guidelines - Copper

    2021-7-19 · Injection Mold Design Guidelines Maximizing Performance Using Copper Alloys SPECIAL ADVERTISING SECTION By Dr. Paul Engelmann and Bob Dealey for the Mold Marketing Task Group of the Copper Development Association Mold Thermal Material Conductivity (Btu/Hr/Ft2/°F) C-17200 60 C-17510 135 C-18000 125 H-13 17 P-20 20 420 SS 14 Nozzle 'O' …

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  • Subsurface Deformation Mechanism in Nano-cutting of ...

    2021-7-19 · During the nano-cutting process, monocrystalline gallium arsenide is faced with various surface/subsurface deformations and damages that significantly influence the product’s performance. In this paper, molecular dynamics simulations of nano-cutting on gallium arsenide are conducted to investigate the surface and subsurface deformation mechanism.

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  • Numerical Investigation of GDI Injector Nozzle Geometry on ...

    2015-9-1 · The large eddy simulation (LES) with Volume of Fluid (VOF) interface tracking method in Ansys-FLUENT has been used to study the effects of nozzle hole geometrical parameters on gasoline direct injection (GDI) fuel injectors, namely the effect of inner hole length/diameter (L/D) ratio and counter-bor

    Get Price
  • Influence of ordered L12 precipitation on strain-rate ...

    2019-4-23 · El-Danaf, E., Kalidindi, S. R. & Doherty, R. D. Influence of grain size and stacking-fault energy on deformation twinning in fcc metals. Metallurgical and Materials Transactions A 30 , 1223–1233 ...

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  • The Effect of Freestream Turbulence on Deposition for ...

    2015-9-23 · Deposition tests indicated that the rate of deposition increases as the freestream turbulence is increased, and that this increase depends upon the particle size distribution. For ash with a mass median diameter of 4.63 μ m, the increase in capture efficiency was approximately a factor of 1.77, while for ash with a larger median diameter of 6 ...

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  • Optimizing cell viability in droplet-based cell deposition ...

    2015-6-11 · Droplet-based cell deposition is receiving increasing attention as a tool to construct or fill a variety of biological tissues. Striking examples are the cell spray treatment of burns 1,2 or ...

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  • Design and optimization of inner-rotation nozzle in ...

    2019-10-24 · The droplet size of the nozzle was studied. The model utilized gamma distribution of multiple parameters and conservation of energy and mass, and was suitable for nozzle design in various environments. According to the domestic and foreign literature works, there are many theoretical analyses on the nozzles.

    Get Price
  • Numerical Investigation of GDI Injector Nozzle Geometry on ...

    2015-9-1 · The large eddy simulation (LES) with Volume of Fluid (VOF) interface tracking method in Ansys-FLUENT has been used to study the effects of nozzle hole geometrical parameters on gasoline direct injection (GDI) fuel injectors, namely the effect of inner hole length/diameter (L/D) ratio and counter-bor

    Get Price
  • Mechanical Characteristics and Optimum Design of SMW ...

    Increasing the size of the flange and web of the section steel had little effect on the deformation of the foundation pit. The flange was sensitive to the deformation of the supporting structure because it was on the stressed side. The different layout forms of the steel section exerted a great influence on the deformation of the foundation pit.

    Get Price
  • Continuous Casting of Steel - University of Illinois ...

    2003-7-29 · selection of the key phenomena and the making of reasonable assumptions. V. Flow through the Submerged Entry Nozzle The geometry and position of the Submerged Entry Nozzle (SEN) are easy and inexpensive to change. These design variables have a critical influence on steel quality through their effect on the flow pattern in the mold.

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  • Factors influencing the effectiveness of split set ...

    2018-9-21 · several parameters which influence bolt effectiveness. If possible, information was gathered on the following: bolt type (i.e. SS33, SS39 or SS46; see Table 2-1), bolt length, drilling bit size, drive time, driver equipment, time elapsed from installation to test, rock type, rock quality (RMR), specific bolt application and pull-out, or slip load.

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  • Mechanical and deformation characteristics of composite ...

    2020-12-16 · The effects of important design factors (foundation pit depth, length-to-width ratio and steel beam interval) on lateral displacements and bending moments of the supporting pile in the worst scenario are analysed. The results show that the composite assembled recyclable supporting structure can effectively control the deformation of the excavation.

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  • Enclosure Design - Saginaw Control

    2021-8-23 · The nozzle is held 2.5 m to 3 m (8.2 to 9.8 ft) for IPX5 and IPX6 from the enclosure, and the spray of water is directed at all surface areas likely to be sprayed. Test duration is 1 minute per square Meter per surface with a minimum of 3 minutes total test duration for IPX5 and IPX6. The nozzle is moved along the entire test surface.

    Get Price
  • Reasonable thickness design of expressway pavement ...

    2019-9-29 · The effect of the treatment has been recognized by designers in the industry. 1 –3 However, factors such as lime treatment, roadbed depth, and reasonable thickness of each layer of pavement structure have great influence on the pavement stress and strain design index. 4 –6 So far, little research has been conducted on the relationship ...

    Get Price
  • Frontiers of Mechanical Engineering

    2021-6-9 · In this work, a mathematical model is developed to describe the relationships among functional performance, design configurations and parameters, and design parameter uncertainties. A multi-level optimization model is established to identify: (1) The optimal design configuration, (2) the optimal values of design parameters, and (3) the boundaries of functional performance …

    Get Price
  • Spray applications: Part III. assessment of viscosities at ...

    2007-12-1 · The ability of a solution to atomize in air spray applications is controlled by a number of factors that can be grouped into two main categories: formulation variables (surface tension, density, low and high shear viscosities, and elasticity) and application variables (pressure, nozzle shape, size, design, and flow rate).

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  • Effect of Motor Length and Propellant Formulation On ...

    2017-2-18 · The study demonstrates two design principles: (a) the propellant burning rate influences the minimum grain length required for nozzleless operation and (b) the variation of burning rate index n with respect to pressure during a run affects the thrust time pattern. ... The grain deformation strongly influences the motor performance since the ...

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  • Design and optimization of inner-rotation nozzle in ...

    2019-10-24 · The droplet size of the nozzle was studied. The model utilized gamma distribution of multiple parameters and conservation of energy and mass, and was suitable for nozzle design in various environments. According to the domestic and foreign literature works, there are many theoretical analyses on the nozzles.

    Get Price
  • Research on the influence of design parameters on ...

    2021-6-14 · Research on the influence of design parameters on mechanical performance of net arch bridge. Xinke Cao 1 *, ... In order to study the suspender layout parameters and design parameters of the tied arch bridge with mesh suspenders under the action of vehicle load, the structure stress is more reasonable and meets the higher economy and aesthetics ...

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  • Numerical Investigation of GDI Injector Nozzle Geometry on ...

    2015-9-1 · The large eddy simulation (LES) with Volume of Fluid (VOF) interface tracking method in Ansys-FLUENT has been used to study the effects of nozzle hole geometrical parameters on gasoline direct injection (GDI) fuel injectors, namely the effect of inner hole length/diameter (L/D) ratio and counter-bor

    Get Price
  • Enclosure Design - Saginaw Control

    2021-8-23 · The nozzle is held 2.5 m to 3 m (8.2 to 9.8 ft) for IPX5 and IPX6 from the enclosure, and the spray of water is directed at all surface areas likely to be sprayed. Test duration is 1 minute per square Meter per surface with a minimum of 3 minutes total test duration for IPX5 and IPX6. The nozzle is moved along the entire test surface.

    Get Price
  • Developments and perspectives on the precision forming ...

    2019-6-21 · Obviously, the coupling effect of size and deformation is critical for hydroforming large size integrated components. As the blank size increased, the wrinkling and rapture occurred easily because of the increasing tangential compressive stress and fraction force, as shown in figure 6. In order to solve these problems, the blank-holder force ...

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  • Investigation of Modeling Strategies for Progressive ...

    Influence of Mesh Size (DBE) First, the influence of mesh size for the DBE approach is studied. The numerical results for 3–15 elements are shown in Fig. 8. As indicated, the mesh size has an important effect on the results. When the number of elements is low, it is hard to accurately describe the displacement field of elements.

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  • PERFORMANCE OF UPHC FILLED STEEL COLUMN

    2020-5-21 · of this research is to study the influence of confinement effect on the behavior of the Super-frame column and to develop guidelines in modern codes for the design of such composite sections. This project report compares the performance UHPC filled steel tubes and conventional sections using a

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  • An experimental study of the influence of lithology on ...

    2019-4-3 · By this paper's research, we can obtain the influence of lithology on the compaction behaviours of broken waste rock. In order to get the better backfill effects, the reasonable lithology can be optimized during backfill. The reasonable particle size can improve the support ability of backfill materials for strata and surface.

    Get Price
  • Reasonable thickness design of expressway pavement ...

    2019-9-29 · The effect of the treatment has been recognized by designers in the industry. 1 –3 However, factors such as lime treatment, roadbed depth, and reasonable thickness of each layer of pavement structure have great influence on the pavement stress and strain design index. 4 –6 So far, little research has been conducted on the relationship ...

    Get Price
  • Experimental Characterization of the Influence of Nozzle ...

    2019-4-1 · This paper experimentally observed at a small level the influence of nozzle temperature change on warping deformation (WD), dimensional Accuracy (DA) and density. The materials chosen are pure PLA and advanced PLA+ specimens of rectangular shape of 63.5 mm × 9.53 mm × 3.2 mm produced by the end-user 3D printer based on fused deposition modeling (FDM).

    Get Price
  • Influence of nozzle exit tip thickness on the performance ...

    2010-3-25 · The influence of exit tip thickness of nozzle δ e on the flow field and performance of a jet pump was studied numerically in this paper. It is found that δ e has influence on the distribution of turbulence kinetic energy k.If δ e is ignored, k takes the highest value but dissipates rapidly than that of nozzle with a certain tip thickness. δ e also affect apparently the development of tip ...

    Get Price
  • Investigating the influence of the jet from three nozzle ...

    2018-10-25 · Investigating the influence of the jet from three nozzle and spear design configurations on Pelton runner performance by numerical simulation S Petley1, A Panagiotopoulos1 2, D S Benzon3, A Židonis1, G A Aggidis1, J S Anagnostopoulos2, D E Papantonis2 1 Lancaster University Renewable Energy Group and Fluid Machinery Group,

    Get Price
  • Influence of nozzle diameter on soot evolution in ...

    2018-8-1 · The fuel stream comprised 41.7% ethylene (C 2 H 4) and 58.3% nitrogen (N 2), by volume.The fuel was diluted to limit the maximum amount of soot in the forced flame and thus minimise the level of interference from soot to the laser diagnostic measurements .For all the studied cases, the volumetric flow rates of the fuel stream and the co-flow were kept constant at …

    Get Price
  • Numerical study for the influences of primary nozzle on ...

    2016-8-5 · The influences of primary nozzle on the performance of steam ejectors were investigated numerically, and the effects of the primary nozzle outlet diameter as well as the divergent section length under different entrained stream pressures on the steam ejector were analyzed and discussed.

    Get Price
  • (PDF) Influence of Nozzle-to-Surface Distance Ratio and ...

    Influence of Nozzle-to-Surface Distance Ratio and Reynolds Number Variation on Hemispherical Tempered Glass Strength and Quench Time March 2017 The …

    Get Price
  • Effect of Nozzle Geometry and Distance on Cooling ...

    The aperture ratio of the nozzle was defined as the ratio of the nozzle opening area and the area to be cooled for one nozzle. In the slit nozzle, a 25A carbon steel pipe with a thickness of 3.2 mm was used for the nozzle header, and a round holes with a size of ϕ3.2 mm were made at a span of 5.6 mm. In the staggered arrangement nozzle, a long ...

    Get Price
  • Effects of dimensional size and surface roughness on ...

    2017-3-23 · Nozzle size is determined by its field of application, even though large scale nozzle performance is more sensitive than that of micro nozzles to the variation of relative roughness. For a conventional macro scale nozzle, it is easy to use mechanical cutting operations to meet the surface roughness technical requirements.

    Get Price
  • (PDF) INFLUENCE OF APEX ANGLE AND NOZZLE DESIGN ON

    A CFD model was developed to understand the effects of water jet apex angle, and nozzle design on droplet dynamics, energy and momentum transfer, and particle size control.

    Get Price
  • Deformation Analysis of Reinforced Retaining Wall Using ...

    In order to reveal the main factors affecting the deformation of reinforced soil retaining wall and the influence of various factors on the deformation, the constitutive relation is discretized into four aspects of soil, geogrid, wall panel, and contact surface, and discrete element matrices are, respectively, constructed, with the method of separate finite element.

    Get Price
  • Stress and Deformation Analyses of Twin-Spirals Scroll ...

    2020-10-13 · deformation of scroll plates analyses were performed under different axial and radial gap at the crank angle that the Maximum compression ratio happens. On the basis of calculated results using CAE, the suitable gap value for twin-spirals scroll plates design was presented, which provided useful data for developing the high-performance twin-

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  • Numerical investigation of cephalopod-inspired locomotion ...

    2018-7-20 · A parametric study has been conducted to document the performance over different combinations of volume change and nozzle size. The optimal performance in terms of speed is achieved when the formation number, a non-dimensional number governing the formation of the vortex ring approaches its critical value.

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  • Influence of surface topography on three-dimensional ...

    2017-9-25 · However, the above theoretical study on the friction of joint surfaces based on the fractal theory is on the basis of the two-dimensional fractal (1Get Price

  • The thermochemical non-equilibrium scale effects of the ...

    2020-8-10 · The high enthalpy nozzle converts the high enthalpy stagnation gas into the hypervelocity free flow. The flow region of the high enthalpy nozzle consists of three parts: an equilibrium region upstream of the throat, a non-equilibrium region near the throat, and a frozen region downstream of the throat. Here we propose to consider the thermochemical non …

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  • Basics of Space Flight: Rocket Propulsion

    2017-11-26 · Specific Impulse. The specific impulse of a rocket, I sp, is the ratio of the thrust to the flow rate of the weight ejected, that is where F is thrust, q is the rate of mass flow, and g o is standard gravity (9.80665 m/s 2).. Specific impulse is expressed in seconds. When the thrust and the flow rate remain constant throughout the burning of the propellant, the specific impulse is …

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  • A New System to Evaluate Comprehensive Performance of Hard ...

    2019-12-5 · The accurate performance evaluation of a cutterhead is essential to improving cutterhead structure design and predicting project cost. Through extensive research, this paper evaluates the performance of a tunnel boring …

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  • Direct influence of residual stress on the bending ...

    2012-3-28 · It is anticipated that the direct influence of residual stress on bending stiffness revealed by the present work, together with the change of the mass and the material stiffness of the surface layer, may help improve understandings of the micro- or nano-cantilever behaviours and potentially enhance their performance.

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  • 6 Best High-pressure Hose Nozzles [Aug 2021] Reviews ...

    2021-8-25 · Below are the best high-pressure hose nozzles that we’ve tested and meticulously categorized. Read on! Here are the best high-pressure hose nozzles you can buy in 2021: Best Overall: Dradco Heavy Duty Brass Fireman Style Hose Nozzle Best For Heavy Use: Gilmour 855032-1001 Best For Basic Needs: Dramm 12380 Best Overall: GREEN MOUNT Water Hose Nozzle Best …

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  • Incremental dynamic analysis of the long-span continuous ...

    2021-6-6 · In the seismic design of long-span bridges, the classic bi-linear model was used to simulate the frictional restoring force of the rubber bearings. However, in actual earthquake, the rubber bearing suffered fluctuating axial pressure in …

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