Effects of surfactant concentration on bubble transport in a double forcing microchannel with sudden expansion
Date Issued
2014
Date
2014
Author(s)
Wu, Cheng-Pu
Abstract
In the present work, the stability of bubble transportation and application of delivery agent with microbubbles, were studied.
The research was categorized into three parts: (1) To investigate the surfactant effect on bubble deformation, a new device, double forcing microchannel (DFM) was designed to maintain the bubble size in desired surfactant concentration; (2) Analyzing the surfactant concentration effect on bubble transportation, by investigation of bubble coalescence, rupture, and bubble deformation in sudden expansion; (3) Using a diverging microchannel and a set of counter-flow microchannesl to prove the effect of drag force and film flow on bubble surface at high concentration of surfactants.
The result showed that the limitations of traditional microbubble generators could be overcome by applying the DFM device. The bubble size could be maintained at different gas-liquid flow ratios and surfactant concentrations. Furthermore, the coalescence, rupture, and deformation of bubbles could be prevented by lowering the concentration of surfactant. This effect was reduced when the surfactant concentration in the liquid became higher. In the final part, to demonstrate the effect of drag force and film flow on the bubble surface at high surfactant concentration, the bubble motions are to be studied in a diverging microchannel and a set of counter-flow microchannels, whereby the complexity is reduced.
Subjects
界面活性劑
雙十字聚焦流道
突擴流道
氣泡結合
微氣泡載體
Type
thesis
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