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

PRODUCTION AND HYDRODYNAMIC PROPERTIES OF MICROBUBBLE MEDIUM

Abstract

Some aspects of production of gas-liquid bubble systems with very small bubbles (microbubble medium) are discussed. Using photographic measurements parameters of a microbubble medium are determined (bubble mean diameter ~ 40 µm). Results of simple hydrodynamic experiments with this medium are described. Measurements of the drag coefficient of a solid ball in the microbubble medium are performed at Reynolds number from 0.1 up to 2.2 × 104 and with gas void fraction less than 2.5 percent. It is shown that with an increase in gas void fraction drag coefficient slightly increases. For Reynolds number less than 10 this apparent increase in friction is due only to the change of effective parameters of the medium. Flow of the microbubble medium in horizontal tubes was investigated under the conditions where the air fraction and the Reynolds number were between 0.0 and 0.7 percent, and between 103 and 2.5 × 104 respectively. The results indicated that in laminar and transitional range for microbubble flows a pseudo-turbulent regime is realized due to the air bubbles. A large increase in the wall friction coefficient take place, which depends monotonically on void frac¬tion. However in the high turbulent range, Re > 3.5 × 103, no noticeable change in the wall friction was found.
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