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2019-6-29 · The effects of nozzle exit geometry on the characteristics of a surface attaching jet were investigated experimentally. Three different types of nozzle geometries were studied, including a circular, square and rectangular nozzle with the same exit area. The jets were discharged with an offset height of two nozzle width at a Reynolds number of 5500.
Get Price2018-10-24 · The k-ε model can be improved for better accuracy but no matter how accurate it can predict the mean properties of the jet development, two equation models are still not capable of capturing the underlying flow structures such as vortex shedding and its effect on small-scale mixing. For better validation and understanding of the flow field in this virtual kiln model, more …
Get Price2021-1-16 · The main objective of this work was to evaluate the effect of subgrid-scale modeling of stress tensor in LES of a turbulent coaxial jet. Simulations were performed using three SGS models (Smagorinsky, DSGS and VSF) as implemented in the PMLES solver, and results were compared to experimental data and other numerical results from the literature.
Get Price2020-11-1 · The present technique is based on the combination of the nozzle-diffuser and a Tesla element to rectify the synthetic jet. The new structure called Tesla coupled nozzle (TCN) enhances the rectifying effect owing to a created side channel that can attenuate and/or block the reversed flow while the chamber draws liquid into the pump.
Get Price2020-5-25 · The design of the probe-type nozzle is based on the in-depth understanding of the abovementioned mechanism, and the first combination of the jet and the supersonic gas in this field is achieved by using the rigid structure of the probe to avoid the expansion force inside the nozzle, thus utilizing the negative pressure of the high-speed airflow or the Stokes drag force.
Get Price2021-8-1 · Effect of micro shot peening on the mechanical properties and corrosion behavior of two microstructure Ti–6Al–4V alloy Appl. Surf. Sci. , 363 ( 2016 ) , pp. 50 - 58 Article Download PDF CrossRef View Record in Scopus Google Scholar
Get Price2020-1-2 · The ability to obtain a range of mechanical properties from a single steel grade reduces the use of alloying elements (elements added to a metal or an alloy which are incorporated in the metallic structure and change in the properties of the basic alloy) and the …
Get Price2014-6-7 · The fuel/oxygen (F/O) ratio is an important parameter which affects the flame temperature. The effect of F/O ratio is investigated by varying its value from 0.1 to 0.5 where the ratio ~0.3 is the stoichiometric value. Figure 9 shows the effect of F/O ratio on the gas phase velocity and temperature. The results show that the gas phase velocity is higher for the F/O ratio …
Get Price2020-8-9 · The water jet at high pressure is used in the manufacturing processes of machines, especially that of cutting. This technique, which is encountered in many industrial applications, is known for its complexity when using the experimental approach. From this viewpoint, an accessible and less expensive method is used, aiming to provide further knowledge on this machining …
Get Price2021-1-5 · Microstructure, tensile property, microhardness and fracture behavior of the hydrogenated Ti-0.3Mo-0.8Ni alloy gas tungsten arc welding (GTAW) joints were investigated. The results show that the microstructure of the hydrogenated 0.21 wt.% H weld zone were composed of alternating lamellar alpha/needle-like transformed beta and the hydride. Transformed beta was …
Get Price2014-9-19 · The present designs of pilot-operated servovalves are either of a flapper-nozzle type or of a jet-pipe type, and the design aspects and various configurations of servovalves, particularly flapper-nozzle types, are available in many textbooks (Merrit 1967, Watton 1989, McCloy and Martin 1980). However, studies investigating deflector-jet type ...
Get Price2017-10-15 · Nozzle was an important component of the drilling device assisted with water jet, which had a profound influence on the effect of water jet drilling. The pressure and velocity distribution characteristics of the flow field were investigated through the numerical simulation to analyze the debris carrying performance and rock breaking performance.
Get Price2020-11-1 · The present technique is based on the combination of the nozzle-diffuser and a Tesla element to rectify the synthetic jet. The new structure called Tesla coupled nozzle (TCN) enhances the rectifying effect owing to a created side channel that can attenuate and/or block the reversed flow while the chamber draws liquid into the pump.
Get Price2021-6-1 · The cooling efficiency of cryogenic coolant is mainly attributed to the viscosity degree of LN 2 +N 2 mixture on workpiece surface [34,35].From Eqs. , , , , the viscous degree is illuminated by temperature and density of LN 2 +N 2 mixture, and it can obtain better viscous at lower temperature. But the higher pressure at lower temperature will increase the escaped V dn based …
Get Price2021-8-1 · Effect of micro shot peening on the mechanical properties and corrosion behavior of two microstructure Ti–6Al–4V alloy Appl. Surf. Sci. , 363 ( 2016 ) , pp. 50 - 58 Article Download PDF CrossRef View Record in Scopus Google Scholar
Get Price2012-5-29 · accommodate the pump’s nozzle size; (3) both located less than 5D from the suction nozzle. In contrast, Figure 7 illustrates an elevation (side) view of a double suction pump with two maybe not perfect, but nevertheless better, practices. They are: (1) A long-radius sweeping 90º elbow in the vertical plane, and
Get Price2019-1-20 · particularly advanced. The use of explosives in coal mines is increasingly restricted in China. Hydraulic fracturing has a softening effect on the roof and at the same time can form cracks, so it is the best way to replace pyrotechnics (Huang …
Get PriceBill Collum, in Nuclear Facilities, 2017. 6.5.4 Gravity flow systems. So we can use mechanical pumps, fluidic systems and steam ejectors to move liquors along, but there is another method that has been around for very much longer: gravity. Process engineers are always on a quest for an easy life, not for themselves of course but for plant operators who will ultimately inherit their …
Get Price2018-3-1 · The nozzle supply line was fitted with an electric heater generating stagnation temperatures in the range of 300 to 450 K. Using a load cell, the thrust produced by the nozzle was measured at each condition. The flow field downstream of the nozzle was surveyed by using a pressure rake and 2-dimensional PIV.
Get PriceDiffusion Flame. Diffusion flames occur in situations of heterogeneous mixing of the fuel and air, when fuel-rich and fuel-lean regions of mixture exist at various places in the combustion chamber. From: Advanced Thermodynamics for Engineers (Second Edition), 2015. Download as PDF…
Get Price2019-2-1 · Electro-hydrodynamic jet printing is a newly developed non-contact printing technology that based on the electro-hydrodynamic effect. In this technique, stable fluid jet is induced by the electric field that sets between the conductive nozzle and substrate. The diameter ratio of jet flow to nozzle can be less than 1/5.
Get Price2021-7-23 · All papers published in this volume of IOP Conference Series: Materials Science and Engineering have been peer reviewed through processes administered by the Editors. Reviews were conducted by expert referees to the professional and scientific standards expected of a proceedings journal published by IOP Publishing.
Get Price2015-10-26 · in order to evaluate the effect of pulse duration. Masuda et al. (1994) observed that the duration of the jet, as well as the num-ber of jet pulses used are both known to affect removal rates. All of our experiments, however, used a single jet burst; we did not observe a strong effect due to varying the jet duration from 25 to 100 ms (Figure 2).
Get Price2019-10-8 · In the electrospinning process, as shown in Fig. 1(a–c), the charge density distribution of the tips and the morphology of the jets are different due to the different number of needles in the space.As shown in Fig. 1(a), the charge distribution of the single needle tip is relatively uniform, and the charge is mainly distributed at the end of the nozzle; As shown in Fig. 1(b), when a needle ...
Get Price2001-3-21 · flow situation, although it may still be classified as double roll. Case B, on the other hand, exhibits more classic double-roll flow behavior. Flow from the nozzle has a less powerful swirl, so flow along the two faces is more symmetrical. The jet is generally shallower (due to the greater effect of gas buoyancy at the lower
Get Price2015-10-26 · in order to evaluate the effect of pulse duration. Masuda et al. (1994) observed that the duration of the jet, as well as the num-ber of jet pulses used are both known to affect removal rates. All of our experiments, however, used a single jet burst; we did not observe a strong effect due to varying the jet duration from 25 to 100 ms (Figure 2).
Get Price2016-5-4 · • Metal powders => Main constituent of a P/M product; final properties of the finished P/M part depends on size, shape, and surface area of powder particles • Single powder production method is not sufficient for all applications Powder production methods: 1. Mechanical methods, 2. Physical methods, 3. Chemical methods 1.
Get Price2019-10-8 · In the electrospinning process, as shown in Fig. 1(a–c), the charge density distribution of the tips and the morphology of the jets are different due to the different number of needles in the space.As shown in Fig. 1(a), the charge distribution of the single needle tip is relatively uniform, and the charge is mainly distributed at the end of the nozzle; As shown in Fig. 1(b), when a needle ...
Get Price2019-10-8 · In the electrospinning process, as shown in Fig. 1(a–c), the charge density distribution of the tips and the morphology of the jets are different due to the different number of needles in the space.As shown in Fig. 1(a), the charge distribution of the single needle tip is relatively uniform, and the charge is mainly distributed at the end of the nozzle; As shown in Fig. 1(b), when a needle ...
Get Price2016-7-13 · use in Cat engines that are configured to use distillate fuel. Residual Fuel This is residue from the distillation of crude oil in a refinery. DO NOT use residual fuel in Cat engines that are configured to use distillate fuel. Aircraft Jet Fuels and Kerosene Type Fuels Aircraft jet fuels and kerosene type fuels may be used as a diesel engine
Get Price2019-7-30 · The nozzle is an important component in the process of centrifugal spinning because its shape, diameter, and direction will affect the jet’s initial shape and the fiber trajectory. 12 The research emphasis is to determine whether there is an optimal curvature of nozzle orifice so that the final fiber diameter can be minimized.
Get Price2015-6-27 · Advanced turbulence closure models: a view of current status and future prospects. International Journal of Heat and Fluid Flow, Vol. 15, No. 3. On the behavior of two‐equation models at the edge of a turbulent region. Physics of Fluids, Vol. 6, No. 5. Turbulence models for compressible boundary layers.
Get Price2019-6-18 · Wang, C. et al. Significance of the double-layer capacitor effect in polar rubbery dielectrics and exceptionally stable low-voltage high transconductance organic transistors. Sci. Rep. 5 , 17849 ...
Get PriceThe present study investigates the effect of tool shoulder profile on the mechanical and tribological properties of friction stir processed AZ31B magnesium alloy. The tool rotational speed and ...
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