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Optical Methods for Data Processing in Heat and Fluid Flow
book

Optical Methods for Data Processing in Heat and Fluid Flow

by Clive Greated, John Cosgrove, James Buick
August 2002
Intermediate to advanced
304 pages
9h 15m
English
Wiley
Content preview from Optical Methods for Data Processing in Heat and Fluid Flow

16

Velocity Measurements in Impinging Turbulent Jets using Digital Particle Image Velocimetry

M Fairweather, G K Hargrave, and T C Williams

Abstract

Two-dimensional measurements of mean and fluctuating velocities, and shear stresses, within the wall jet region of impinging turbulent air and water jets have been obtained using a Digital Particle Image Velocimetry (DPIV) technique. The data gathered demonstrate that DPIV can be used to derive useful information in this type of flow, of value in improving understanding of what is a practically important flow configuration. The present air jet results, considered in detail, are in good agreement with earlier measurements in similar flows gathered using laser Doppler anemometry, although significant differences do occur with previous hot wire anemometer measurements.

16.1 Introduction

The impingement of a jet on a solid flat surface is a flow configuration of interest in many engineering applications, including cooling, heating, and drying processes, vertical take-off and landing aircraft, and ventilation during mining and tunnelling activities. It is also encountered in evaluations of the consequences of accidental releases of flammable material performed as part of safety and risk assessments on chemical and process plant, and transportation systems.

The orthogonally impinging jet has been the subject of renewed interest lately, not only because of its practical importance, but also because it represents an important test case for ...

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ISBN: 9781860582813Purchase book