Abstract
Processes of the air entrapment in microstructures fabricated on walls of rectangular microchannels were visualized by a high-speed camera. Effects of the geometry of the microstructures on the formation and the shape of the liquid–gas interface in the microstructures were investigated with four channels having the same dimensions but different microstructure geometries at Re = 1. The microchannels were made of stainless steel and acrylic, and the microstructures were hydrophobized by triazinethiol. Water–ethanol mixtures with different mixing rate (ranged from 0:100 to 100:0) were employed as the test liquids, thereby effects of the wettability on the liquid–gas interface formation process could be investigated as well. Consequently, four types of the interface behaviors were observed. In addition, observing the flow of the liquid–gas interface area, to investigate the effect of the liquid–gas interface has on the flow.
Published Version
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