Wall Shear Stress Induced by Taylor Bubbles in Inclined Flow Channels

0391691 - ÚCHP 2014 CZ eng A - Abstract
Tihon, Jaroslav - Pěnkavová, Věra - Vejražka, Jiří
Wall Shear Stress Induced by Taylor Bubbles in Inclined Flow Channels.
Program and Abstracts. Prague: ICPF ASCR, 2013. s. 130. ISBN N.
[Workshop on Smart and Green Interfaces 2013. 20.3.2013-22.03.2013, Prague]
Grant - others:COST(XE) MP1106
Program: COST Actions
Institutional support: RVO:67985858
Keywords : air bubbles * flat channels * terminal velocity
Subject RIV: CI - Industrial Chemistry, Chemical Engineering

The experiments are carried out for three different channel configuration (with heights of 1.5, 4, and 8 mm), cover a wide range of channel inclination angles (from horizontal to vertical position), and dealing with both the bubbles in stagnant and in co-flowing water. The directionally sensitive, two-strip electrodiffusion probe is proved to be an effective tool to investigate the near-wall flow response to translating bubbles. It provides information not only on the wall shear rate distribution, but also detects the location of near-wall flow reversal, gives an estimate of the thickness of liquid film separating the large bubble from the wall, and provides also the characteristics of capillary waves appearing in the bubble tail region. The effect of channel inclination angle on the modification of wall shear stress distribution along the upper and bottom wall is also discussed.
Permanent Link: http://hdl.handle.net/11104/0220677