Liquid Flow in Rectangular Microchannels with Gradient Wettability Inner Surface Driven by Capillary Force and Gravity
作者：Cheng Jiang，Tao Yuhong，Zhang Yong，Cai Zhi-Qi，Pi Pihui，Wen Xiufang，Zheng Dafeng，Yang, Zhuoru，Lu, Longsheng，Tang Yong
關鍵字：Flow-front, Microchannel, Wetting gradient, Contact angle, Driving force
論文來源：會議
具體來源：FUNDAMENTAL OF CHEMICAL ENGINEERING, PTS 1-3叢書: Advanced Materials Research 卷: 233-235 頁: 1152-1156
發表時間：2011年
A mathematical model for predicting liquid flow velocity in a rectangular microchannel driven by capillary force and gravity is derived. The model takes into account the additional driving force arising from the wettability gradient on inner surface of a microchannel. The results of model prediction show that the velocity of liquid flow decreases with the length of microchannel and the wettability gradient on channel surface will accelerate the motion of the liquid when the flow-front approaches to the end of the microchannel. The analysis of driving force along the moving path matches well with the flow velocity predicted by the model.