We discuss a bifurcation phenomenon of Marangoni flow in a microchannel T-junction and its novel unidirectional pumping effect.The T-junction is formed by a main channel connected with a liquid reservoir and a side ch...We discuss a bifurcation phenomenon of Marangoni flow in a microchannel T-junction and its novel unidirectional pumping effect.The T-junction is formed by a main channel connected with a liquid reservoir and a side channel outlet to the atmosphere.A volatizing meniscus is formed in the side channel and Marangoni convections are generated due to the non-uniform evaporation on the meniscus.It is found for weak evaporations (Ma < 270) the Marangoni convections are symmetrical.However,for intense evaporations (Ma > 270),the initial inward symmetrical Marangoni convection becomes unstable and converted into one single vortex flow.Moreover,the single vortex induces a steady unidirectional flow in the main channel,acting like a pump.展开更多
基金Supported by the National Natural Science Foundation of China Co-operated with Guangdong Provincial Department of Science and Technology under Grant No U0934006Common Development Fund of Beijing.
文摘We discuss a bifurcation phenomenon of Marangoni flow in a microchannel T-junction and its novel unidirectional pumping effect.The T-junction is formed by a main channel connected with a liquid reservoir and a side channel outlet to the atmosphere.A volatizing meniscus is formed in the side channel and Marangoni convections are generated due to the non-uniform evaporation on the meniscus.It is found for weak evaporations (Ma < 270) the Marangoni convections are symmetrical.However,for intense evaporations (Ma > 270),the initial inward symmetrical Marangoni convection becomes unstable and converted into one single vortex flow.Moreover,the single vortex induces a steady unidirectional flow in the main channel,acting like a pump.
