title: Drag Reduction by Bubble-Covered Surfaces Found in PDMS Microchannel through Depressurization.
abstract: Drag reduction was found in polydimethylsiloxane (PDMS) microchannels when the flow was pulled by depressurization at the inlet, and it was attributed to the formation of the bubbles on the PDMS surface. The formed bubbles were examined by atomic force microscopy (AFM), and the resultant effective slip length was measured by microparticle image velocimetry (μPIV). The drag reduction was found to decrease as the bubbles grew and detached from the surface, causing a pulsatile flow in the microchannel.
authors.affiliation: State Key Laboratory of Tribology, Tsinghua University , Beijing 100084, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Gao
authors.affiliation: Mechanical engineering school, University of Science and Technology Beijing , Beijing 100083, China.
authors.forename: Jiang
authors.initials: J
authors.lastname: Li
authors.affiliation: Department of Mechanical Engineering, University of Hong Kong , Pokfulam Road, Hong Kong.
authors.forename: Ho Cheung
authors.initials: HC
authors.lastname: Shum
authors.affiliation: State Key Laboratory of Tribology, Tsinghua University , Beijing 100084, China.
authors.forename: Haosheng
authors.initials: H
authors.lastname: Chen