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2020-4-22 · determine the effect of air inlet angle are inconclusive and require further investigation. The air-jet texturing process is widely known for its ability to produce spun-like synthetic continuous filament yarns. Structural modification is achieved by contact of the continuous feed yarn with a supersonic air stream delivered by a nozzle. The
Get Price'Effect of Nozzle Geometry on the Flow Charact eris tics of Small W ater Jets', Proceedings of the Institution of Mechanical Engineers, Part C, Journal of M echanical Engineering Science, Vol. 220 ...
Get Price2018-2-17 · The best texturing comes from nozzles with a slightly diverging main channel and a single air inlet hole located far from the nozzle exit. A curved diverging exit profile is essential for successful texturing. The results of the tests to determine the effect of air inlet angk …
Get PriceResults are presented of a wide-ranging investigation of geometry effects on the flow parameters and jet characteristics of nozzles with diameters between 120 and 170 mu m. Nozzles …
Get PriceEffect of nozzle geometry on pressure drop and heat transfer in submerged jet arrays ... Download Free PDF. ... Influence of the shape of the nozzle on local heat transfer distribution between smooth flat surface and impinging air jet. By Vadiraj Katti. Single-Phase Microscale Jet Stagnation Point Heat Transfer.
Get Price2016-7-19 · a stepped nozzle (Figure 1), a straight pipe, a converging-diverging nozzle (Figure 3) and an energy-efficient nozzle (Figure 4). The energy efficient nozzle is a combination of a stepped nozzle and a diverging part connected at the back. This geometry permits the surrounding air to be entrained. NOMENCLATURE
Get Price2019-2-1 · Nozzle geometry does have a significant impact of nozzle performance. Effect of single-phase air flow through a nozzle revealed the effect of different nozzle parameters on nozzle performance. A lower diverging angle and no elongated throat gave the best critical pressure ratio and a low pressure drop.
Get Price2018-2-23 · This study investigates the effect of nozzle geometry on the intermingling process. The dimensions of intermingling nozzles with single air inlets extended across the width of a rectangular yam channel are systematically varied. Nozzles with this cross-sectional shape prove to be easy to manufacture and efficient at intermingling.
Get Price2012-7-4 · The effect of nozzle geometry on the structure of a supersonic free jet is investigated both experimentally and numerically for three simple nozzle geometries. In the experiments, the relation between the Mach disk height and diameter and the nozzle pressure ratio are investigated using the schlieren method. In contrast to results obtained in previous studies, our experimental results show ...
Get PriceThe effect of nozzle geometry on sonic line and characteristics of supersonic air jet was studied. Computational fluid dynamics was applied in this study. The axisymmetric nozzle geometries investigated were two different contour converging nozzles, two different conically converging sharp-edged nozzles and a sharp-edged orifice. The results show that the supersonic jet structure, sonic line ...
Get PriceEffect of nozzle geometry on pressure drop and heat transfer in submerged jet arrays ... Download Free PDF. ... Influence of the shape of the nozzle on local heat transfer distribution between smooth flat surface and impinging air jet. By Vadiraj Katti. Single-Phase Microscale Jet Stagnation Point Heat Transfer.
Get Price2019-2-1 · Nozzle geometry does have a significant impact of nozzle performance. Effect of single-phase air flow through a nozzle revealed the effect of different nozzle parameters on nozzle performance. A lower diverging angle and no elongated throat gave the best critical pressure ratio and a low pressure drop.
Get PriceThe nozzle aspect ratio has a more significant effect on the near-field jet stream characteristics for both fluids than the orifice inlet shape. Longer nozzles (l /d = 20) form more stable jet streams and delay the breakup of sheets, leading to greater breakup length than that attained with shorter nozzles (l …
Get Price2013-4-2 · Air-Powered Liquid Needle Free Injectors: Design, ... nozzle geometry can be varied. ... stagnation pressures of the jet based on the effect of different parameters such as driver pressure (400-800 kPa), nozzle size (130-250 μm) and injection chamber length (10-25 mm). The results of these tests are then compared to the behaviour prescribed by the
Get Price2016-8-30 · ABSTRACT Begenir, Asli. The Role of Orifice Design in Hydroentanglement. (Under the direction of Dr. Behnam Pourdeyhimi) This research was devoted to study the role of the nozzle geometry in the
Get Price2013-10-1 · proles, nozzle geometry, presence or absence of co-o w and presence or absence of side walls), very few of these initial conditions have been systematically assessed. Previous work has tested to some degree, the effect of nozzle geometry [1], effect of nozzle exit turbulence on jet spreading [2], effect
Get Price2012-9-20 · Istanbul, Turkey August 21-23, 2012 ISSN: 2227-4596 ... Experiment and Performance Prediction of Bubble-Jet Type Air-Lift Pump for Dredging Sediments on Sea and Lake Beads 27 ... Performance Study of Nozzle Geometry on Heat Transfer Characteristics - Part I: Local Heat Transfer 42
Get Price2015-5-20 · workers focused on the influence of the ink-jet print head geometry, the diameter of the nozzle exit, amplitude and frequency of electrically driven signals, and liquid properties, density, viscosity and surface tension on the drop formation, but little is known about the effect of the wetting condition
Get Price2021-1-2 · The classical quasi-one-dimensional Laval nozzle, which has a slender geometry, with a rapidly converging short entrance, a rounded throat, and a long conical exhaust of some 15º half-cone angle (the loss of thrust due to jet divergence is about 1.7%).
Get Price2018-10-24 · 3. Results and Discussion. To investigate the effect of initial Re on the jet development, four simulations with different nozzle diameters D j = 0.0012, 0.0015, 0.0018, and 0.0021 m were run with grid 2 based on the grid study results. With the same initial mass flow rate 0.031 kg/s as in the PIV measurement by Larsson et al. [], the jet initial velocities are U j = 27.70, 17.73, 12.31, and 9 ...
Get PriceAll nozzles showed comparable mass flow rates for the same impact force and the difference was in the order of 5% better than a straight pipe geometry. Only the energy saving nozzle used around 10% less mass flow and is the best solution to reduce compressed air consumption without losing performance. en_ZA. dc.description.librarian.
Get PriceThe nozzle aspect ratio has a more significant effect on the near-field jet stream characteristics for both fluids than the orifice inlet shape. Longer nozzles (l /d = 20) form more stable jet streams and delay the breakup of sheets, leading to greater breakup length than that attained with shorter nozzles (l …
Get Price2015-5-20 · workers focused on the influence of the ink-jet print head geometry, the diameter of the nozzle exit, amplitude and frequency of electrically driven signals, and liquid properties, density, viscosity and surface tension on the drop formation, but little is known about the effect of the wetting condition
Get Price2013-4-2 · Air-Powered Liquid Needle Free Injectors: Design, ... nozzle geometry can be varied. ... stagnation pressures of the jet based on the effect of different parameters such as driver pressure (400-800 kPa), nozzle size (130-250 μm) and injection chamber length (10-25 mm). The results of these tests are then compared to the behaviour prescribed by the
Get Price2019-10-17 · Effect of Extrudate Swell, Nozzle Shape, and Convergence Zone ... polymer being injected into a large open mold and free surface open air boundary conditions are not considered. The fiber orientation in the polymer melt flow beyond the nozzle exit where the ... understand the effect of nozzle geometry on fiber orientation. Modeling Approach .
Get Price2013-1-3 · These are called “Variable geometry convergent-divergent” (or Con-Di) nozzles. Depending on the level of control upon this divergent section, Con-Di nozzles can be of two types: • One-parameter Nozzles: also called 1-DOF nozzles; A8 is fully controlled, and A9 follows a pre-defined relationship to A8. The current EJ200 nozzle is of this type.
Get Price2012-9-20 · Istanbul, Turkey August 21-23, 2012 ISSN: 2227-4596 ... Experiment and Performance Prediction of Bubble-Jet Type Air-Lift Pump for Dredging Sediments on Sea and Lake Beads 27 ... Performance Study of Nozzle Geometry on Heat Transfer Characteristics - Part I: Local Heat Transfer 42
Get PriceMicro abrasive jet machining (MAJM) is a high effective economical technology for three dimensional micro structure fabrications of brittle materials. It is widely used in the fabrication of semiconductors, electronic devices, micro electro-mechanical systems (MEMS), optical-electronic and optical devices, and medical instruments. In this paper, based on the experimental study of MAJM for ...
Get Price2007-10-31 · Convective heat transfer to an impinging air jet is known to yield high local and area averaged heat transfer coe–cients. The current research is concerned with the mea-surement of heat transfer to an impinging air jet over a wide range of test parameters. These include Reynolds Numbers, Re, from 10000 to 30000, nozzle to impingement
Get Price2015-7-20 · Effect of water spray on air humidity ratio (75°C-80 % RH – Counter Flow) In the meantime, relative humidity starts to increase and it reaches saturation point (%100 RH) represented in Figure 4. If air cooled below the dew point, water vapor starts to condensed as droplets. Figure 5 represents the effect of water injection on
Get Price2012-9-20 · Istanbul, Turkey August 21-23, 2012 ISSN: 2227-4596 ... Experiment and Performance Prediction of Bubble-Jet Type Air-Lift Pump for Dredging Sediments on Sea and Lake Beads 27 ... Performance Study of Nozzle Geometry on Heat Transfer Characteristics - Part I: Local Heat Transfer 42
Get Price2021-8-10 · formed by the cooling fins. The effect of air flow entrance is obvious on the coefficient of heat transfer and fin efficiency. Engineers need to select the high efficient heat sink with the best performance among a wide range sorts of heat sinks working under impinging jet from the comparison of thermal resistances of the optimized pin
Get Price2020-11-13 · [11]) if the certain parameters such as the distance between nozzles and the characteristic jet velocity are selected properly. One of the early fluidic oscil-lators based on internal jet interactions is the so-called “feedback-free” fluid-ic oscillator developed by Raghu [12]. …
Get Price2018-1-4 · the downstream body position and also the free jet Reynolds number, u∞D/υ. Figure 2 shows the research geometry for this study. The jet flow is generated from a nozzle exit by using source elements inside the nozzle. The source distribution is chosen to be parabolic so as to provide a correct initial velocity profile at the nozzle exit.
Get Price2005-9-5 · Life Assessment of a Jet Engine Component E. Acar 1, M. A. Akgün Summary Thermo-mechanical fatigue life of pins connecting the first stage low pressure turbine (LPT) nozzle to the LPT nozzle support in an F110-GE-100 engine has been assessed. A commercial finite element code is used for thermal and stress analysis.
Get Price2015-7-20 · Effect of water spray on air humidity ratio (75°C-80 % RH – Counter Flow) In the meantime, relative humidity starts to increase and it reaches saturation point (%100 RH) represented in Figure 4. If air cooled below the dew point, water vapor starts to condensed as droplets. Figure 5 represents the effect of water injection on
Get Price2021-4-9 · terials. Water jet guided laser is a technology that overcomes most of these issues, where pressurized water in the process provides focusing, cooling and cleaning on the cut region, eliminating undesired side effects of the laser. In this study, cutting performanceof a water jet guided laser system and a s conventional laser system were compared.
Get Price2016-3-10 · jet is used as a promising candidate to remove more heat from electrical components [2]. The nozzle geometry of impinging jets can be rectangular or circular. According to many studies conducted on impinging jets for circular and slot jets, the flow field and thermal characteristics are different in slot jets compared to circular jets. Jet ...
Get Price2020-3-31 · the effects of injection timing and nozzle angle on various blends formation and combustion performance in 3D model. The study has been conducted for 25 different cases. Wang et al. [10] have numerically analyzed the effect of ignition position and fuel injection timing on the engine performance and combustion in a direct-
Get PriceA propelling nozzle is a nozzle that converts the internal energy of a working gas into propulsive force; it is the nozzle, which forms a jet, that separates a gas turbine, being gas generator, from a jet engine.. Propelling nozzles accelerate the available gas to subsonic, transonic, or supersonic velocities depending on the power setting of the engine, their internal shape and the pressures ...
Get Price2020-4-22 · determine the effect of air inlet angle are inconclusive and require further investigation. The air-jet texturing process is widely known for its ability to produce spun-like synthetic continuous filament yarns. Structural modification is achieved by contact of the continuous feed yarn with a supersonic air stream delivered by a nozzle…
Get Price'Effect of Nozzle Geometry on the Flow Charact eris tics of Small W ater Jets', Proceedings of the Institution of Mechanical Engineers, Part C, Journal of M echanical Engineering Science, Vol. 220 ...
Get Price2018-2-17 · The best texturing comes from nozzles with a slightly diverging main channel and a single air inlet hole located far from the nozzle exit. A curved diverging exit profile is essential for successful texturing. The results of the tests to determine the effect of air inlet angk are inconclusive and require further investigation.
Get PriceResults are presented of a wide-ranging investigation of geometry effects on the flow parameters and jet characteristics of nozzles with diameters between 120 and 170 mu m. Nozzles with circular ...
Get PriceEffect of nozzle geometry on pressure drop and heat transfer in submerged jet arrays ... Download Free PDF. ... Influence of the shape of the nozzle on local heat transfer distribution between smooth flat surface and impinging air jet. By Vadiraj Katti. Single-Phase Microscale Jet Stagnation Point Heat Transfer.
Get Price2016-7-19 · a stepped nozzle (Figure 1), a straight pipe, a converging-diverging nozzle (Figure 3) and an energy-efficient nozzle (Figure 4). The energy efficient nozzle is a combination of a stepped nozzle and a diverging part connected at the back. This geometry permits the surrounding air to be entrained. NOMENCLATURE
Get Price2019-2-1 · Nozzle geometry does have a significant impact of nozzle performance. Effect of single-phase air flow through a nozzle revealed the effect of different nozzle parameters on nozzle performance. A lower diverging angle and no elongated throat gave the best critical pressure ratio and a low pressure drop.
Get Price2018-2-23 · This study investigates the effect of nozzle geometry on the intermingling process. The dimensions of intermingling nozzles with single air inlets extended across the width of a rectangular yam channel are systematically varied. Nozzles with this cross-sectional shape prove to …
Get Price2012-7-4 · The effect of nozzle geometry on the structure of a supersonic free jet is investigated both experimentally and numerically for three simple nozzle geometries. In the experiments, the relation between the Mach disk height and diameter and the nozzle pressure ratio are investigated using the schlieren method. In contrast to results obtained in previous studies, our experimental results show ...
Get PriceThe effect of nozzle geometry on sonic line and characteristics of supersonic air jet was studied. Computational fluid dynamics was applied in this study. The axisymmetric nozzle geometries investigated were two different contour converging nozzles, two different conically converging sharp-edged nozzles and a sharp-edged orifice. The results show that the supersonic jet structure, sonic line ...
Get Price2011-5-31 · targets with very uneven surfaces, the jet nozzles may have to be located too far from the surface. For jets starting at a large height above the target (over 20 jet nozzle diameters) the decay in kinetic energy of the jet as it travels to the surface may reduce average Nu by …
Get Price2021-1-2 · The classical quasi-one-dimensional Laval nozzle, which has a slender geometry, with a rapidly converging short entrance, a rounded throat, and a long conical exhaust of some 15º half-cone angle (the loss of thrust due to jet divergence is about 1.7%).
Get Price2017-12-13 · CHAPTER 5 EVALUATION OF THE EFFECT OF NOZZLE ASSEMBLY, OPERATING CONDITION AND INSULATION TO PCU PERFORMANCE 100 5.1 Overview 100 5.2 Effect of Nozzle Assembly Design 100 5.3 Effect of Oxygen Flowrate 113 5.4 Effect of …
Get Price2021-8-10 · formed by the cooling fins. The effect of air flow entrance is obvious on the coefficient of heat transfer and fin efficiency. Engineers need to select the high efficient heat sink with the best performance among a wide range sorts of heat sinks working under impinging jet from the comparison of thermal resistances of the optimized pin
Get Price2012-5-10 · Effect of To and Po on Performance Axisymmetric nozzle, Diffuse wall, Tw=300 T=300 K T=2000 K T=1000 K To~2,300 K •For high To, a shorter nozzle would give better performance at lower Re. •Need to optimize geometry of high temperature nozzles. •For lower pressures, the peak value of Isp is closer to the nozzle throat.
Get Price2014-12-23 · To date, the effect of premix fuel nozzle geometry on combustion dynamics has not been well-documented. This paper presents experimental stability data from several different fuel nozzle geometries (i.e., changing the axial position of fuel injection in the premixer, and considering simultaneous injection from two axial positions).
Get Price2021-7-23 · Here, numerical and experimental results demonstrating the effects of surfactants on jet break-up and drop formation at the scales relevant to drop-on-demand inkjet printing are presented. The rapid expansion of the free surface during the fast jetting process results in a depletion of surfactants along the air–liquid interface, resulting in ...
Get Price2005-9-5 · Life Assessment of a Jet Engine Component E. Acar 1, M. A. Akgün Summary Thermo-mechanical fatigue life of pins connecting the first stage low pressure turbine (LPT) nozzle to the LPT nozzle support in an F110-GE-100 engine has been assessed. A commercial finite element code is used for thermal and stress analysis.
Get Price2019-11-25 · K. Bilen, “ An experimental investigation of heat transfer characteristics of a normal and oblique air jet impinging on heated flat plate,” Ph.D. thesis, KTU University, Turkey, 1994. Google Scholar; 46. L. Huang and M. S. El-Genk, “ Heat transfer of an impinging jet on a flat surface,” Int. J. Heat Mass Transfer 37, 1915– 1923 (1994).
Get Price2020-5-11 · sieve, the air jet sieve is the device of choice for sieving fine powders. This is where the air jet sieve e200 LS develops maximum effectiveness. Not just one, but two compo-nents work together here: a slotted nozzle which rotates inside the sieving chamber and an industrial vacuum cleaner connected up to the sieving chamber.
Get Price2016-9-22 · When retardation effects were neglected, – N = 4820 hours the life requirement is 2410 hours. The component retirement time given by Turkish Air Force is arou nd 1500 -1800 hours as dictated by the technical orders. So, TMF results of this study is reasonable value. We calculate d a
Get Price2015-1-6 · These test cases were 1) axisymmetric convergent conical nozzles of 15, 25, and 40 deg half-angle as well as a reference nozzle; 2) the 25 deg half-angle nozzle with a splitter plate inserted in its plane of symmetry; and 3) the vortex shedding observed at the base of the splitter plate.
Get Price2018-9-19 · This geometry formulation is coupled with an automated viscous and compressible flow solution method and a cost-effective design space exploration (DSE) approach. The framework is deployed to optimise the performance of a separate-jet exhaust …
Get Price2020-11-13 · [11]) if the certain parameters such as the distance between nozzles and the characteristic jet velocity are selected properly. One of the early fluidic oscil-lators based on internal jet interactions is the so-called “feedback-free” fluid-ic oscillator developed by Raghu [12]. …
Get Price2017-9-1 · retaining critical features of the geometry. For example, the trailing edge, beginning of the centerbody, the aft end of the nozzle, and the corner points at the junction of the axis and the farfield are maintained in the coarse grids as constraining parameters in much the same manner as they appear in the finest grid. In our implementation we have
Get Price2004-4-1 · Effect of Raw Material Characteristics (of the Feed Yarn) on Structure and Properties of Air Jet Textured Yarns. II. Effect of Filament Cross-Sectional Shape, Melliand Textilberichte, 71(12): 935-937 & E421-E422. Google Scholar
Get Price2011-6-15 · A jet exhaust produces a net thrust from the energy obtained from combusting fuel which is added to the inducted air. This hot air is passed through a high speed nozzle, a propelling nozzle which enormously increases its kinetic energy. [1]For a given …
Get Price2017-10-20 · Physicochem. Probl. Miner. Process., 54(1), 2018, 174-181 177 Fig. 3. (a) Jameson cell (b) Jet Diffuser Flotation Column 2. Experimental In the experimental study, a naturally hydrophobic talc sample with a purity of 97.6% (based on MgO)
Get Price2019-3-27 · Title: The Effect of the height of the horizontal layer of a liquid and pressure on hydrodynamic regimes of evaporation/boiling and critical heat flux Vladimir Zhukov, Novosibirsk State Technical University, Russia Title: The modification of Ekman-Hartmann layer by the imposition of axial velocity Satyanarayana Badeti, VIT - AP University, India
Get Price2016-1-14 · long operation of turbine blades and nozzle guide vanes. The overall engine dimensions of 500 mm maximum length and 145 mm maximum diameter dictated a short length and small diameter combustor and in turn will increase the difficulties of achieving an optimum design in terms of geometry and performance results.
Get Price2015-1-6 · These test cases were 1) axisymmetric convergent conical nozzles of 15, 25, and 40 deg half-angle as well as a reference nozzle; 2) the 25 deg half-angle nozzle with a splitter plate inserted in its plane of symmetry; and 3) the vortex shedding observed at the base of the splitter plate.
Get PriceThe University of Technology in Baghdad represented by the Civil Engineering Department has been collaborated with the Istanbul Technical University-Turkey to set the fourth release of the International Conference on Buildings, Construction and Environmental Engineering (BCEE4), which is being held this year in Istanbul Technical University, Ayazaga Campus from 7 to 9 October 2019.
Get Price2016-1-14 · long operation of turbine blades and nozzle guide vanes. The overall engine dimensions of 500 mm maximum length and 145 mm maximum diameter dictated a short length and small diameter combustor and in turn will increase the difficulties of achieving an optimum design in terms of geometry and performance results.
Get Price2021-6-2 · Design and configuration of the microfluidic device. Figure 1 displays a representative microfluidic device with parallel flow restrictive elements (arranged in a …
Get Price2005-5-5 · Purchase Engineering Turbulence Modelling and Experiments 6 - 1st Edition. Print Book & E-Book. ISBN 9780080445441, 9780080530956
Get PriceThe spray analysis, the knowledge of stray distribution, geometry and structures is a fundamental for many industrial applications. Here we present the optical method for non-contact spray investigation based on the principle of light interference. The advantages of this method are demonstrated on three examples from industrial application, each examining the two phase flow systems in various ...
Get Price63 rd Annual Assembly & International Conference of the International Institute of Welding 11-17 July 2010, Istanbul, Turkey Numerical optimization of gas metal arc welding torches using ANSYS CFX M. Dreher 1,a, U. Füssel 1 and M. Schnick 1 1 Dresden University of Technology, Dresden, Germany [email protected] Abstract Gas metal arc (GMA) welding of aluminium, high alloyed
Get Price2019-3-27 · Title: The Effect of the height of the horizontal layer of a liquid and pressure on hydrodynamic regimes of evaporation/boiling and critical heat flux Vladimir Zhukov, Novosibirsk State Technical University, Russia Title: The modification of Ekman-Hartmann layer by the imposition of axial velocity Satyanarayana Badeti, VIT - AP University, India
Get Price2021-1-29 · coherent jet with the steel bath. The model predicts the decarburization kinetics, including the distribution of the in-bath components, flow patterns, and bath temperatures, and can be used to optimize the refining process. 8. Ladle Furnace Ladle treatment is an important step for adjusting the final composition and tempera-
Get Price2020-3-30 · Shock Diamonds and Mach Disks in jet engines exhaust can be particularly evident and fascinating at night. The video below shows RAF Lakenheath’s Propulsion Test Cell during a test of an F-15E ...
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