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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

DROPLETS MOVEMENT AND COALESCENCE IN HYDROPHOBIC MICROCHANNEL

Chao Wang
School of Hydraulic, Energy and Power Engineering, Yangzhou University, Yangzhou, Jiangsu 225127, P. R. China

Xiangdong Liu
School of Hydraulic, Energy and Power Engineering, Yangzhou University, Yangzhou, Jiangsu 225127, P. R. China

Chaoqun Shen
School of Hydraulic, Energy and Power Engineering, Yangzhou University, Yangzhou, Jiangsu 225127, P. R. China

Yongping Chen
School of Hydraulic, Energy and Power Engineering, Yangzhou University, Yangzhou, Jiangsu 225127, P. R. China; Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, Jiangsu 210096, P. R. China

Abstract

Based on volume of fluid (VOF) method, a three-dimensional model of droplet behaviors is developed to numerically investigate the movement and coalescence of droplets in a rectangular microchannel with hydrophobic inner surface. The detailed movement and coalescence of droplets under different stream flow velocity and droplets diameter are numerically simulated to elucidate the effects of these influence factors on the coalescence time, coalescence position and the droplet interface oscillation after the coalescence. The results indicate that the coalescence occurs under the conditions of two equal-sized droplets and the binary droplets with a smaller front one. Under the propelling of the main stream, the droplet skews to the flow direction with the contact angle hysteresis appearing. During the coalescence process, the oscillation of contact area between the coalescent droplet and channel wall occurs, which is damped to be a stable value at last. With the increase of stream flow velocity, the coalescence time decreases and the coalescence distance increases at first and then decreases.

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