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  • Effect of Nozzle Geometry on Air-Jet Texturing Performance

    2020-4-22 · 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 details of the flow patterns are influenced by the geometry of the nozzle. This

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  • Effect of Geometry on the Performance of Intermingling

    '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 ...

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  • EFFECT OF NOZZLE GEOMETRY ON THE EFFICIENCY OF

    2018-2-17 · In order to facilitate the research, an air-jet texturing nozzle with a rectangular cross section has been developed. The texturing performance of the nozzles is assessed by means of process observations and on-line measurement of stabilizing zone tension, and also by measuring the in creased linear density of the yams on textured yarn samples.

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  • Numerical Investigation of Multi Square Jet Impingement ...

    2019-9-14 · ondergoesa 45 , 180 , and 90 axis swiching. In the another study on different nozzle geometry Trinh et al [6] the effect of nozzle geometry on local convective heat transfer to unconfined impinging air jets investigated. In this study round orifice and cross-shaped geometry take in to

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  • A CENTRAL-TYPE JET PUMP MODEL FOR WHEAT GRAINS

    area ratios of R= 0.155, 0.25 and 0.4). The effect of nozzle to throat spacing to nozzle diameter ratio 'X' with values of 1, 1.5 and 2, on the jet pump performance was also tested under different flow rates and motive pressures. From the experimental work, the beast and suitable nozzle …

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  • NUMERICAL ANALYSIS OF FLAME CHARACTERISTICS

    2010-8-25 · High velocity impinging air jets are commonly used for heating, cooling and drying, etc. because of the high heat and mass transfer coefficients which are developed in the impingement region. In order to provide data for the designers of industrial equipment, a variety of slot nozzles were tested to determine the effect on heat transfer of both nozzle shape and slot width.

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  • Effect of Air-Jet Texturing on Adhesion Behaviour of ...

    The objective of this work is to study experimentally the characteristics of jet pump. Suction head, driving air pressure and the percentage of the distance between throat section and nozzle are recorded. The effect of each parameter on the pump performance is investigated, in order to have a better understanding about the behavior of such pump under various conditions.

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  • ANALYSIS OF HEAT AND MASS TRANSFER OF THE

    2019-10-20 · nozzle. The obtained data shows that there is a recirculation zone at the near region inside the conical nozzle which suggests the existence of air entrainment along the wall of conical nozzle. The air stream resulting from the air entrainment is expected to be heated by the flame and therefore enhance the flame stability. Moreover, this study

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  • THRUST VECTORING NOZZLE FOR MILITARY AIRCRAFT

    For each of these properties, the most efficient nozzle was the one for which the mass flow rate of compressed air was the lowest. 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 ...

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  • Role of Nozzles with Air Holes in Air Entrainment by a ...

    The 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 /d = 5). For similar Reynolds ...

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  • Influence of liquid hydrophobicity and nozzle passage ...

    2013-1-3 · Nozzles. The ITP Nozzle is a 3-D Vectoring Nozzle. Also, there are different ways to achieve the deflection of the gas jet: the most efficient one is by mechanically deflecting the divergent section only, hence minimizing the effect on the engine upstream of the throat (sonic) section. The ITP concept consists of a patented design featuring

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  • Experimental and Numerical Investigation of a Pressure ...

    2021-7-25 · AIR ENTRAINMENT BY A WATER JET 789 Experimental Program The water jet velocity, V j, at the nozzle exit was varied from 2.5 to 15 m/s. The water jet length, L j, from the nozzle outlet to the plunging point of a water jet on the water surface of the tank, was 0.30 m.

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  • Jet Impingement Heat Transfer: Physics, Correlations, and ...

    2015-5-20 · 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

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  • Effect of Tabs on the Flow and Noise Field of an ...

    2017-3-15 · peaks which occurs at water-air interface. The time history of the measured aircore diameter at mid-nozzle is given in Figure 6a. The mean air core diameter at the measurement location is evaluated as 1.08 mm which is 0.07 mm smaller than the measurement of Dash et.al.[14]. The mean aircore diameter at the exit of the atomizer is evaluated as 1 ...

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  • Effects of design parameters on a multi jet impinging heat ...

    2011-5-31 · The same air canbe routed to a perforated internal wall to form ... The jet emerges from a nozzle or opening with a velocity and temperature profile and turbulence characteristics dependent upon the upstream flow. For a pipe-shaped nozzle, also called a tube nozzle ... effect of the wall upstream. The nonuniform turning flow experiences high

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  • ADVANCES in FLUID MECHANICS - WSEAS

    2012-9-20 · 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

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  • FLUID FLOW AND HEAT TRANSFER OF AN IMPINGING

    2007-10-31 · 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

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  • Effect of Nozzle Length on Breakup Length of Liquid Jet ...

    Furthermore, one has to point out that the stability of jets may be influenced by the turbulence in the nozzle and the velocity profile. This work presents the experimental result about the effect of the nozzle length on the breakup length of liquid jets in the air and in the immiscible liquid, as the beginning of a systematic investigation of the influence by these factors on the breakup of jet.

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  • Geometry Effect of Air Suction Gun on the Yarn Suction ...

    We experimentally discussed the effects of airflow geometries in an air suction gun on the suction characteristics of running yarn. Geometry parameters focused on were 1) compressed-air inflow angle of nozzle, 2) diverging angle of nozzle, 3) throat diameter of de Laval tube, 4) converging angle of de Laval tube and 5) yarn propulsion tube length.

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  • Experimental Study of Air-Lift Pumps Characteristics

    2015-2-2 · the percentage of the distance between throat section and nozzle and the driving air pressure, suction head and also study the effect of each parameter on the air lift pump characteristics in order to have a better performance of such pump under various conditions. A certain geometry for air-lift pump designed and manufactured.

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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 divergence is about 1.7%).

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  • Experimental Study of Direct Contact Condensation of

    2015-7-20 · 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

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  • Multiparameter Optimization of Thrust Vector Control

    2021-7-19 · and main flow to 5.4% at high-pressure ratios (injection of a hydrogen jet into the air flow). The width of the slotted nozzle varies from 0.1 to 0.5 mm, which at a fixed pressure ratio leads to a change in the length of the recirculation zone and the depth of penetration of the jet into the supersonic flow in a close to linear relationship ...

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  • A review on nozzle wear in abrasive water jet machining ...

    2017-6-2 · A review on nozzle wear in abrasive water jet machining application H. Syazwani1, G. Mebrahitom, A. Azmir 1Faculty of Manufacturing Engineering, Universiti Malaysia Pahang, 26600 Pekan, Pahang, Malaysia . E-mail :[email protected], [email protected], [email protected] . Abstract.This paper discusses a review on nozzle wear in abrasive water jet …

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  • OPTIMIZATION OF A HIGH-EFFICIENCY JET EJECTOR BY ...

    2021-5-13 · A number of researchers made an effort to understand the effect of jet ejector geometry on jet ejector performance. For example, Kroll (1947) investigated the effect of convergence, divergence, length, and diameter of the throat section, nozzle position, induced fluid entrance, and motive velocity. Croft and Lilley (1976) investigated the

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  • ACHIEVING EFFICIENCY IN ABRASIVE BLAST CLEANING jpcl

    2012-3-23 · To investigate the effect of abrasive size and hardness, nozzle geometry and pressure, and abrasive/air mixing ratio on blasting efficiency, a series of tests was per-formed in a laboratory-scale blasting test facility. A spe-cially designed test cabinet was built to measure the compressed air consumption and abrasive flow rate (Fig. 1).

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  • Fuel Injection: Breaking Up is Hard to Do - Ansys

    2014-12-23 · 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).

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  • University of Pretoria

    2020-11-11 · effect on spray simulation. CFD simulation with LES has substantially improved engineers’ understanding of the fundamental physics of the primary breakup process and the impact of the nozzle geometry on spray structure. Delphi engineers are moving forward …

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  • Optimization of Fuel Inlet Port Geometry of an Air ...

    We studied the structural properties, bursting strength and pilling properties of single jersey knitted fabrics made from OE rotor spun yarns. Raw material of 100% cotton of the Urfa region of Turkey was specifically handled in the study. The yarns were produced with dif ferent nozzle types with a yarn of linear density of 19.67 tex. Five different ceramic nozzles were used in yarn production.

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  • Inclined slot jet impinging on a moving wall

    2015-8-20 · affected by the nozzle design such as the length-to- 3. The grid contains 100*36 points for an 8d configuration starting upstream of the jet duct. This 4.2.1 Air jet duct inlet The condition in the inlet jet duct (boundary AC in fig. l) is important in predicting the center line velocity and developed flow. The nozzle diameter d was 3 7 cm.

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  • MULTIPHASE FLOWS IN MATERIALS PROCESSING

    2019-3-23 · The air is supplied at 60 bars through air inlet port. By the effect of vacuum created by relatively high pressure air, fuel is sucked in to the mixing chamber where air and diesel phases are mixed together. This two-phase flow comes out from the …

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  • Water Jet Guided Laser vs. Conventional Laser ...

    2016-7-4 · the stagnation point location of orthogonal jet impinging an immobile wall 2 Problem Statement 2. 1 Geometry of problem The geometry and boundary condition are summarized in figure (1). The flow is steady in average and fully turbulent. The fluid (air) is incompressible with constant thermo-physical properties. The jet exit velocity is V j

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  • CFD Modelling of Primary Atomisation of Diesel Spray

    2021-6-28 · MULTIPHASE FLOWS IN MATERIALS PROCESSING Modeling Argon Gas Behavior in Continuous Casting of Steel HYUNJIN YANG,1,3 SURYA P. VANKA,1,4 and BRIAN G. THOMAS 2,5 1.—Department of Mechanical Science and Engineering, University of Illinois at Urbana-Cham-

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