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RESEARCH PAPERS

Measurement in the Wake Region of Two Bubbles in Close Proximity by Combined Shadow-Image and PIV Techniques

[+] Author and Article Information
A. Tokuhiro

Power Reactor and Nuclear Fuel Development Corporation, 4002 Narita, Oarai, Ibaraki 311-1393, Japan

A. Fujiwara, K. Hishida, M. Maeda

Department of System Design Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, 223-8522 Japan

J. Fluids Eng 121(1), 191-197 (Mar 01, 1999) (7 pages) doi:10.1115/1.2822001 History: Received May 11, 1998; Revised October 19, 1998; Online December 04, 2007

Abstract

An experimental study on flow around two similarly-sized, adjacent air bubbles confined in a 1000 mm vertical, square channel (100 × 100 mm2 ) with downward flow of water was conducted. The bubbles were D = 11.7 mm in major diameter, ellipsoidal in shape (0.4 ml volume) and 12 mm apart. The Reynolds and Eötvös numbers were 1950 < ReD < 2250, 11 < Eo < 11.5 such that the bubbles oscillated. Velocity measurements were taken using Digital Particle Image Velocimetry, Complemented by Laser Induced Fluorescence. Simultaneously, a second CCD camera recorded the shadow image of the bubble pair’s motions. Visualization revealed that the bubbles move out of phase and do not collide nor coalesce. The velocity data revealed the dynamic interaction of two wake-flow velocity fields with a jet-like flow in-between. From the DPIV data, estimates of the vorticity, Reynolds-stress and turbulent kinetic energy (TKE) distributions confirmed the spatio-temporal nature of the flow. Details will be presented.

Copyright © 1999 by The American Society of Mechanical Engineers
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