Effects of various surfactants on bubble/liquid transport in a T-junction microchannel with sudden contraction
Date Issued
2012
Date
2012
Author(s)
Chen, Huai-Jhu
Abstract
The present study focused on the transport phenomena of gas-liquid two-phase flow of bubbles in microchannels. The T-junction microfluidic device with a sudden contraction section was used in the experiment, and the channel dimensions were 200 μm × 100 μm. Variations in the transport velocities of different bubbles were observed when they passed through the sudden contraction section. In addition, different liquids were adopted as the continuous phase in the study. There are three major aspects of this study: First of all, the commercial software, Fluent, was used to analyze the surface tension effect on transportation phenomena in the microchannel. Second, effects of surface tension and viscosity effect were investigated by changing the concentration of ethanol solution. Third, the effects of surfactant type were observed by adding S111n and S131 respectively into the water.
Experimental results showed that when the concentration of surfactants S111n and S131 exceeded the CMC limit at the identical surface tension, the bubbles would exhibit different patterns. The wetting behaviors of bubbles were different between two different types of surfactant solutions. Transport velocities of bubbles in S131 solution were faster than bubbles in S111n solution, and the wettability of S131 was also higher than that of S111n.
Subjects
surfactant
two-phase flow
sudden contraction microchannel
bubble
SDGs
Type
thesis
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