请登录 0 购物车
首页 图书 电子图书 期刊 参考文献及会议录 作者,编辑,审稿 A-Z 产品目录
ICLASS 94
Proceedings of the Sixth International Conference on Liquid Atomization and Spray Systems

ISBN 打印: 978-1-56700-019-1

ISBN 在线: 978-1-56700-445-5

TURBULENCE DECAY IN LIQUID JETS

Abstract

A study has been made of the flow patterns and turbulence characteristics in free liquid jets in order to determine the rate of decay of turbulence properties along the jet. Mean streamwise velocities and streamwise and cross-streamwise turbulence intensities were measured using laser Doppler velocimetry. The jet Reynolds number was varied between 1000 and 30000, with the diameter of the liquid jet D = 3.051 mm. Using a power law model for the time decay of turbulent kinetic energy, it was found that turbulence decays, on average with an exponent N=1, independent of the Reynolds number. A constant power for the decay implies Reynolds number similarity throughout this range. Substantial reductions in the degree of anisotropy occur in the downstream direction from the injector exit as the jet relaxes from fully developed turbulent pipe flow profile to a flat profile. For the intermediate range of Reynolds numbers (10000-20000), the relaxation distance was 20D, almost independent of the Reynolds number. At high values of Reynolds number (20000-30000), the relaxation process was very fast, generally within 3 diameters from the injector exit.
首页 Begell Digital Portal Begell数据库 期刊 图书 电子图书 参考文献及会议录 作者,编辑,审稿 A-Z 产品目录 订购及政策 关于BegellHouse 联系我们 Language English 中文 Русский 日本語 Português Deutsch Français Español