Surfactant Effect on Bubble Transport in a Small Channel with Sudden Contraction
Date Issued
2011
Date
2011
Author(s)
Chen, Hsing-Yueh
Abstract
The observation of the effect of surfactant on bubble transport in a gas/liquid two-phase channel flow with a sudden contraction is done. There are three important points: (i) the effect of surfactant on the bubble shape and bubble transport velocity when it is passing the block, and (ii) the change of liquid contact angle on a solid surface, which is due to the surfactant and the variation of surface tension, results in a corner flow effect, and (iii) the Marangoni effect induced by surfactant cause the change of bubble shape and the variation of bubble transport velocity as the bubble passes the block. The Marangoni effect is seen as the most important factor affecting the bubble transport. In many researches, the Marangoni effect plays an important role in droplet collision with surfactant added. In our research, we focus on the bubble transport in a small channel. When surfactant is added, the surfactant concentration at the gas/liquid interface perturbed by the sudden contraction structure, resulting in an inhomogeneous surfactant concentration on the interface. The inhomogeneous surfactant concentration may cause a surface tension gradient on the interface, enhancing Marangoni effect and benefitting the bubble transport through the block.
Subjects
surfactant
two-phase flow
bubble
sudden contraction small channel
Marangoni effect
Type
thesis
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