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  • (PDF) Effect of nozzle geometry on pressure drop and

    Effect 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.

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  • EFFECT OF NOZZLE GEOMETRY ON THE

    2016-7-19 · 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

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  • Effect of nozzle exit shape on the geometrical features

    2020-1-15 · Mogi and Horiguchi experimentally compared the flame geometry of high pressure hydrogen jet fires of circular and rectangular exits. Even though the experimental data in , , revealed the important effect of nozzle exit shape on the flame geometry, a systematical study seems to lack. In details, the nozzle exit is …

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  • On the influence of nozzle geometry on jet diffusion ...

    2020-3-1 · The nozzle geometry had a significant influence on the down-wash and lift-off of the flame under cross-wind conditions. The triangle nozzle was prone to the appearance of the down-wash phenomenon, and the rectangular nozzle flame easily exhibited the lift-off phenomenon. Additionally, the effect of the nozzle geometry …

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  • (PDF) Influence of nozzle geometry on spray ...

    For high injection pressure the LL results are much more similar since the effect of The aim of this paper has been to study the influence of cavitation reduces the effective area in the cylindrical nozzle geometry and cavitation phenomena on internal nozzle making it closer to the conical nozzles. flow, fuel/air mixing process …

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  • Effect of Geometry on the Performance of Intermingling

    2018-2-23 · 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 …

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  • The effects of nozzle geometry on waterjet breakup at

    2003-9-2 · Note that, as mentioned by Lin and Reitz (), the above formulations do not take into account the effect of nozzle geometry.Recent studies by Hiroyasu (Hiroyasu et al. 1991; Hiroyasu 2000), Arai et al. and Tamaki et al. have shown that the nozzle geometry may have a significant impact on the characteristics of such …

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  • Nozzle Length Effect on the Performance of the Jet

    2021-2-18 · The nozzle length-to-diameter ratio ln dn varied in the 0.77 ≤ ln dn ≤ 4.17 range. The cylindrical chamber length Lch determining the air jet length ljet in the interval between the covers and Lch dn = 0.5–3.5. The outlet opening diameter in the back cover dout varied within the limits dout dn = 1–2.5.

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  • A Brief Review on Design and Operation Principle for ...

    pressure nozzle Liquid turbulence and attenuation effect of the tangential velocity component of the liquid in a centrifugal or swirl-type nozzle leads to atomization. The atomization conditions of the centrifugal type nozzle depend on the magnitude of the angular or swirling velocity of the water. After leaving the orifice, water forms an air …

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  • The effect of air swirl profile on the instability of a ...

    breakup process of the liquid jet is a ected by a large number of factors, including flow conditions, fluid properties and nozzle geometry (Lin & Reitz 1998). The various forces involved in the breakup process are inertial, surface tension, aerodynamic, centrifugal, and viscous. Some of the forces resist the disintegration …

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  • The Effect of Nozzle Geometry on Pressure Drop and

    2009-8-24 · Whelan, BP, & Robinson, AJ. 'The Effect of Nozzle Geometry on Pressure Drop and Heat Transfer to Free Surface Liquid Jet Arrays.' Proceedings of the ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference collocated with the ASME 2007 InterPACK Conference.

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  • Effects of nozzle geometry on direct injection diesel ...

    2021-8-13 · Please cite this article as: R. Payri, F.J. Salvador, J. Gi meno, J. de la Morena, Effects of nozzle geometry on direct injection diesel engine combustion process, Applied Thermal Engineering (2008), doi: 10.1016/j.applthermaleng. 2008.10.009 This is a PDF file of an unedited manuscript that has been accepted …

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  • Effect of nozzle geometry on the efficiency of

    All 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. …

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  • (PDF) Impact of Process Parameters and Nozzle

    2.2.5.3 Core and effect air-jet textured yarns Multiple ends overfed into a texturing nozzle at different speeds constitute the core and effect textured yarns. Core component is usually fed at a slower speed than the effect yarn. The versatility of the air-jet texturing process is best observed by the core-effect operation.

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  • Effect of Nozzle Shape and Polymer Additives on Water

    The effects of shape parameters on the performance of water-jet nozzles discharging in air were investigated using a camera specially adapted for jet photography. The boundary-layer developing on the exit surface of the nozzle is shown to account for the jet appearance revealed by high speed photography.

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  • Experimental Study on Effects of Nozzle Hole

    2009-11-2 · The effect of injection pressure was not significant at retarded injection timings, i.e., 5 ATDC. The convergent nozzle was found to produce higher soot emissions compared with the straight-hole nozzle under the same injection conditions. Effects of the convergent nozzle on NO x emissions and fuel …

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  • Effect of Burner Geometry on Heat Transfer

    2020-7-13 · An experimental investigation is carried out on an inverse diffusion flame (IDF) burners having central air jet and being surrounded by fuel jets for an impingement heat transfer. A thorough investigation has been performed to study the effects of the diameter of air jet, orientation of fuel jets and swirl in the central air jet …

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  • THRUST PERFORMANCE OF ISOLATED PLUG

    2020-8-6 · The nozzle will then take on the general appearance of the unsuppressed plug and should have relatively high performance. The square-spoke plug nozzle evaluated in this test had 40 spokes. Each of these spokes was slanted 15° from vertical to improve the mix-ing of the nozzle jet with the external flow, and, thus, to reduce jet …

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  • Wiping Effect of CGL on Appearance of Hot-Dip

    2019-3-6 · ing an air or nitrogen gas jet on the strip with wiping nozzles, which are installed above the molten zinc pot facing the front and back sides of the strip. The process that has the greatest influence on the appearance of hot-dip coated steel sheets at CGLs is this gas wiping process. For example, the jet flow of the wiping nozzles

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  • Coherent Structure Dynamics in Jets from Irregular

    2012-8-20 · 15th Australasian Fluid Mechanics Conference The University of Sydney, Sydney, Australia 13-17 December 2004 Coherent Structure Dynamics in Jets from Irregular Shaped Nozzles J. Hart1,2, J. Naser1,2 and P. Witt 1,3 1Cooperative Research Centre for Clean Power from Lignite 2School of Engineering & Science, …

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  • Effects Of Chemical Composition On The

    2019-12-17 · expanded sootblower jet in recovery boilers. The air pressure at the nozzle inlet was 5.5Mpa. The peak impact pressure (PIP) of the jet as a function of distance between the nozzle and the deposit surface was pre-determined using a Pitot tube. It was also calculated based on the air pressure and the nozzle geometry.

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  • P Received 20 December - NOPR: Home

    2016-7-20 · 2.2 Design and Fabrication of Air-jet Nozzle An air-jet nozzle for cone winding machine has been designed and fabricated in the laboratory. The basic geometry of the air-jet nozzle is shown in Fig. 1. It consists of two components, i.e. vortex assembly (dotted portion) and outer assembly (shaded portion).

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  • A Brief Review on Design and Operation Principle for ...

    pressure nozzle Liquid turbulence and attenuation effect of the tangential velocity component of the liquid in a centrifugal or swirl-type nozzle leads to atomization. The atomization conditions of the centrifugal type nozzle depend on the magnitude of the angular or swirling velocity of the water. After leaving the orifice, water forms an air …

    Get Price
  • Hairiness Reduction of Yarns by Nozzles at Ring

    2018-3-2 · Swirling effect of the air, caused by the design of the nozzles seems to be main reason behind hairiness reduction. 10, 20 and 30 tex Z-twisted ring spun yarns were produced with and without nozzles and tested for hairiness, tensile and evenness properties.

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  • Investigation of effects of compressibility, geometric

    The effect of jets interaction has been evaluated by changing the jet axis distances (1.1-, 3- and 5-nozzle diameters). They have concluded that twin circular synthetic jets at jet axis distances equal to 3 and 5 diameters show the same behaviour with respect to the single circular synthetic jets.

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  • Short cylindrical nozzles in a jet-driven Helmholtz ...

    2020-7-1 · The appearance of the jet tone of the hole and the alternation of acoustic modes were observed with a smooth increase in the Reynolds number to ∼8 · 10 4. The measurements showed very high amplitude of pressure fluctuations in an oscillator with a short nozzle and a short chamber at a significant jet velocity.

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  • Jet Impingement onto a Dimpled Surface with

    2003-10-20 · The effect of dimple geometry was considered with two different dimple configurations: hemispherical and cusped elliptical. Moreover, the effect of crossflow on jet deflection and heat transfer reduction was also investigated by either installing or removing sidewalls: one-way spent air exit, two-way spent air exit and four-way spent air …

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  • STUDY OF THE PARABOLIC AND ELLIPTIC

    2012-5-10 · jets, including helium, air and CO. 2 . jets exiting with 40 m s velocity in a low-speed air co-flow. He was concerned to study density and nozzle geometry effects on jet structure. Antoine . et al. [5] performed measurements in turbulent water jet flowing with an injection velocity equal to 10 m/s and emerging in a low …

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  • SWIRL EFFECTS ON DYNAMICS

    2017-12-2 · the central jet and to vary each time the velocity of the annular jet and to characterize the effect of control on the flow for various air-flows injected into the annular tube. The swirl number is a dimensionless quantity characterizing the rotating flow. It is defined as [4]: S = Gϕ /RS x where Gϕ is the axial flux of the tangential …

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  • ROCKET EXHAUST PLUMES - Engineering108.com

    2013-1-1 · the heat and impingement effects and possible contamination of vehicle com- ponents (see Ref. 18-3). The boundary layer next to the nozzle wall is a region of viscous flow, and the flow velocity is lower than in the main nozzle inviscid flow. The velocity decreases to zero right next to the wall.

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  • NOZZLES - UPM

    2021-1-2 · 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 …

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  • Nozzles - NASA

    2021-5-13 · The nozzle sits downstream of the power turbine. A nozzle is a relatively simple device, just a specially shaped tube through which hot gases flow. However, the mathematics which describe the operation of the nozzle takes some careful thought. As shown above, nozzles come in a variety of shapes and sizes …

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  • Hairiness Reduction of Yarns by Nozzles at Ring

    2018-3-2 · Swirling effect of the air, caused by the design of the nozzles seems to be main reason behind hairiness reduction. 10, 20 and 30 tex Z-twisted ring spun yarns were produced with and without nozzles and tested for hairiness, tensile and evenness properties.

    Get Price
  • DESIGN AND CFD ANALYSIS OF CONVERGENT

    2017-9-25 · used nozzle since in using it the propellant can be heated incombustion chamber. In this project we designed a new Tri-nozzle to increase the velocity of fluids flowing through it. It is designed based on basic convergent-Divergent nozzle to have same throat area, length, convergent angle and divergent

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  • Effects Of Chemical Composition On The

    2019-12-17 · expanded sootblower jet in recovery boilers. The air pressure at the nozzle inlet was 5.5Mpa. The peak impact pressure (PIP) of the jet as a function of distance between the nozzle and the deposit surface was pre-determined using a Pitot tube. It was also calculated based on the air pressure and the nozzle geometry.

    Get Price
  • Investigation of effects of compressibility, geometric

    The effect of jets interaction has been evaluated by changing the jet axis distances (1.1-, 3- and 5-nozzle diameters). They have concluded that twin circular synthetic jets at jet axis distances equal to 3 and 5 diameters show the same behaviour with respect to the single circular synthetic jets.

    Get Price
  • Jet Impingement onto a Dimpled Surface with

    2003-10-20 · The effect of dimple geometry was considered with two different dimple configurations: hemispherical and cusped elliptical. Moreover, the effect of crossflow on jet deflection and heat transfer reduction was also investigated by either installing or removing sidewalls: one-way spent air exit, two-way spent air exit and four-way spent air …

    Get Price
  • Influence of the Boundary Layer State on the

    2019-1-25 · INFLUENCE OF THE BOUNDARY LAYER STATE ON THE TRANSITION OF A DUAL-BELL NOZZLE 1. A. Barklage1, R. Radespiel1, 1Institute of Fluid Mechanics, TU Braunschweig, Braunschweig, D-38108, Germany Abstract The wake flow jet interaction of a generic space launcher with an integrated dual-bell nozzle as main …

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  • Influence of Gas-Injector Geometry on Atomization ...

    1989-12-1 · The atomizing performance an aerated-liquid nozzle is examined with special emphasis the influence gas-injector geometry spray characteristics. A Malvern spray analyzer is used to measure mean drop sizes and drop-size distributis. All measurements are carried out when spraying water into air at normal …

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  • Experimental Investigation of the Effects of

    2015-12-15 · inhibiting effect of turbulence on the pre-ignition reactions. Further consideration of the influence of the air velocity on the flow and mixing fields in the CTHC geometry [15, 16] revealed that at any given spatial location an increase in U air was accompanied by: (i) an increase in the turbulent velocity fluctuations, but …

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  • Momentum and Vorticity Balances in a Jet that Issues

    2014-12-18 · suing from different nozzles (smoothed, orifice and long pipe) and concluded that except for the different geometry, the jet Reynolds number and also the low aspect ratios can produce remarkable changes on jet half-width and the downstream evo-lution of the turbulence intensity of the streamwise velocity.

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  • MICRO MACHINING PROCESSES - IIT Kanpur

    2016-2-4 · Flaring of the Jet Cavity dimension changes with a change in NTD. Abrasive particles repeatedly hit on the work surface. Brittle fracture separates out tiny particles (wear particles) to produce a cavity. Cavity width ≥ Nozzle inner diam. (Depends on NTD). Cavity Depth depends on work piece feed rate, abrasive particle mass (or density) and pressure (or velocity of the jet).

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  • An Investigation of Initial Shock Cell Formation in ...

    2016-6-27 · the jet on its wall side as it exits the nozzle, and which also tends to deflect it towards the wall. Subsequently, this pressure field will continue to force the jet towards the surface. An ad-ditional viscous effect, namely the entrainment of the ambient fluid between the jet and the surface, may also help to move the jet …

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  • BAFFLE BURNER CONCEPT - Bloom Eng

    2005-7-29 · Geometry also influences the amount of furnace gases recirculation into the port, a major factor in reducing NOx levels. The baffle passages are essentially nozzles which create a jet effect on the exit side. A jet exiting a nozzle creates a recirculation zone and a low pressure area at the exit. the port, ensures thorough mixing of the air

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  • 1. INTRODUCTION - oecd-nea.org

    2008-8-29 · This is why the air entrainment has to be modeled in meso-scale simulations. In the frame of an Euler-Euler simulation, the local morphology of the phases has to be considered in the drag model. In the impinging jet configuration, the air is a continuous phase above the water level but bubbly below the water level.

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  • Flow Analysis of Annular Jets by Proper Orthogonal ...

    2008-12-7 · the end of the annular jet recirculation zone. Then the effect of acoustic waves on instabilities of the stagnation point of an annular jet will be discussed and will be explained by application of P.O.D. on P.I.V. measurements of active control. Fig. 2 Structure of the annular jet nozzle . A diagram of annular jet is shown in fig …

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  • Study of Large-Scale Structures in Isothermal and

    2008-6-17 · The combustion rig (Fig. 1b) consisted of a burner, air fan, plenum chamber, flow seeding device, premixing chamber, and a section for the air and fuel (propane) flowrate control. The burner represented the profiled contraction nozzle with the same geometry as was in the water jet experiment. For the flow

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  • The effects of fuel–air mixing and injector dribble on ...

    2019-1-17 · The primary focus of research and development has been on NOx and soot emissions reductions for diesel engines over the last two decades. The solution adopted by most diesel engine manufactures is a combination of optimized combustion system designs with moderate levels of exhaust gas recirculation …

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  • Paper ID ICLASS06-131 BALLISTIC IMAGING OF

    2017-3-15 · ICLASS-2006 Aug.27-Sept.1, 2006, Kyoto, Japan Paper ID ICLASS06-131 BALLISTIC IMAGING OF THE NEAR FIELD FOR JETS IN GASEOUS CROSSFLOW D. Sedarsky 1, M. Paciaroni 1, M. Linne 1, T. Meyer 2, B. Kiel 3, and J. Gord 3 1Depart m ent of C obust in P hys cs, Lund U v rsi t, Ma [email protected] f.l .se 2Innovative …

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  • ROCKET EXHAUST PLUMES - Engineering108.com

    2013-1-1 · the heat and impingement effects and possible contamination of vehicle com- ponents (see Ref. 18-3). The boundary layer next to the nozzle wall is a region of viscous flow, and the flow velocity is lower than in the main nozzle inviscid flow. The velocity decreases to zero right next to the wall.

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  • A piston geometry and nozzle spray angle

    2021-7-9 · A piston geometry and nozzle spray angle investigation in a DI diesel engine by quantifying the air-fuel mixture Pavlos Dimitriou1, Weiji Wang1 and Zhijun Peng2 1School of Engineering & Informatics, University of Sussex, Brighton, BN1 9QT, UK 2School of Engineering & Design, University of Hertfordshire, Hatfield, …

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  • Spray A Nozzle Tip Temperature Measurements

    2018-7-2 · control the injector (in the cold flow vessel, the injector is heated). The geometry of these cooling systems and their ability to limit the heat rise may have an effect on the fuel temperature. At last, a ceramic cover is used to protect the nozzle tip from the ambient gas hot

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  • Lecture 8-1

    2016-11-22 · Piezoelectric Effect In some dielectric materials (crystals, ceramics, polymers) without center symmetry, an electric polarization can be generated by the application of mechanical stresses.----Piezo-electricity – P = d σ, direct effect – ε= d E , converse effect. P: polarization (pC/m. 2) σ: stress (N/m. 2) ε:strain

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  • Compressible Flow in a Converging-Diverging Nozzle

    2012-1-19 · compressibility effects (i.e. changes in density ) are important. At Ma = 1.0, the flow is called sonic, since V = a. At Mach numbers greater than 1.0, the flow is called supersonic, since the velocity is greater than the speed of sound. Bullets fired from a gun travel at supersonic speeds, as do certain jet aircraft.

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  • Diesel Fuel Injector Nozzles

    2020-9-3 · Abstract: The fuel injector nozzle is critical to the performance and emissions of diesel engines.Some of the important injector nozzle parameters—including details of the injector seat, the injector sac and nozzle hole size and geometry…

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  • Converging Diverging Nozzle - Virginia Tech

    2005-2-23 · To get a basic feel for the behavior of the nozzle imagine performing the simple experiment shown in figure 2. Here we use a converging diverging nozzle to connect two air cylinders. Cylinder A contains air at high pressure, and takes the place of the chamber. The CD nozzle exhausts this air into cylinder B, which takes …

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  • Injector Deposits - DieselNet

    2020-9-3 · An example of a test using a secondary measure is the XUD-9 test described later where the effect of the deposit is quantified by its effect on airflow through the injector nozzle. A test that measures tertiary effects of injector deposits is the DW10 test, also described later, that uses engine power to quantify the effect …

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  • EFFERVESCENT ATOMIZATION OF ... - Begell House

    The air-to-liquid ratio by mass (ALR) has comparably less impact on the breakup at the nozzle orifice outlet. Nevertheless an increasing ALR results in decreasing Sauter mean diameters and standard deviations s 2. The atomizer geometry has minor impact on the breakup and the resulting drop size distribution.

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  • (PDF) Multistructured Electrospun Nanofibers for Air ...

    PDF | Air filtration materials (AFMs) have gradually become a research hotspot on account of the increasing attention paid to the global air quality... | Find, read and cite all the research you ...

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  • Rotor Spinning

    2021-8-23 · Rotor Spinning - Free download as PDF File (.pdf), Text File (.txt) or read online for free.

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  • P Received 20 December - NOPR: Home

    2016-7-20 · 2.2 Design and Fabrication of Air-jet Nozzle An air-jet nozzle for cone winding machine has been designed and fabricated in the laboratory. The basic geometry of the air-jet nozzle is shown in Fig. 1. It consists of two components, i.e. vortex assembly (dotted portion) and outer assembly (shaded portion).

    Get Price
  • Nozzle Design

    The MOC technique begins with a series of points describing the flow field (i.e., Mach number and flow direction) along a “start line.” The start line is generated by a transonic (0.8 . Mach number 1.5) flow field analysis of the throat region.. Using these points and the geometry of the nozzle …

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  • Interactive Nozzle Simulator - NASA

    2021-5-13 · A jet nozzle will have a larger throat area and a lower chamber total pressure than a rocket nozzle. Input and output can be performed using either English units or Metric units as selected by using the choice button. The input variables are located at the lower right on three panels; geometry, flow, and …

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  • STUDY OF THE PARABOLIC AND ELLIPTIC

    2012-5-10 · jets, including helium, air and CO. 2 . jets exiting with 40 m s velocity in a low-speed air co-flow. He was concerned to study density and nozzle geometry effects on jet structure. Antoine . et al. [5] performed measurements in turbulent water jet flowing with an injection velocity equal to 10 m/s and emerging in a low …

    Get Price
  • Short cylindrical nozzles in a jet-driven Helmholtz ...

    2020-7-1 · The appearance of the jet tone of the hole and the alternation of acoustic modes were observed with a smooth increase in the Reynolds number to ∼8 · 10 4. The measurements showed very high amplitude of pressure fluctuations in an oscillator with a short nozzle and a short chamber at a significant jet velocity.

    Get Price
  • MICRO MACHINING PROCESSES - IIT Kanpur

    2016-2-4 · Flaring of the Jet Cavity dimension changes with a change in NTD. Abrasive particles repeatedly hit on the work surface. Brittle fracture separates out tiny particles (wear particles) to produce a cavity. Cavity width ≥ Nozzle inner diam. (Depends on NTD). Cavity Depth depends on work piece feed rate, abrasive particle mass (or density) and pressure (or velocity of the jet).

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  • Introduction to Non-Traditional Machining

    2016-10-5 · The Nozzle The nozzle is one of the most vital elements controlling the process characteristics . The nozzle material should be hard to avoid any significant wear due to the flowing abrasive. [Normally WC (avg. life: 12-30 hrs.) or Sapphire (Appr. = 300 hrs.) are used] For a normal operation the cross-sectional area of the …

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  • Aerodynamic study and control of instabilities of the ...

    2021-7-19 · the suppressionof the appearance of the swirls. The Strouhal numbers for this study is between0,38and 2,47. 2.4 Flow seeding. Flow seeding is one of the most important aspects of P.I.V.measurements.The intake air is seededwith 23 m diameter olive oil droplets.These were generate d in anatomizer by passing air …

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  • Waterjet University - Precision and Quality

    2021-8-28 · Effect of nozzle height. For best cut quality, an optimum distance between the nozzle and the work piece should be maintained. Typically, between 0.0625' and 0.125' (1.5 – 3.0 mm) is the optimum height for abrasive waterjet cutting. As the distance increases above 0.125', rounding on the top edge of the …

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  • Structure and mixing of a transverse jet in

    describes the jet centreline location for r ranging between 5 and 35 and for two different nozzle diameters. 3. Mixing and flame length If the jet contains a substance that reacts rapidly with one carried in free stream, then the rate of disappearance of the jet reactant or the appearance of the

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