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Second Thermal and Fluids Engineering  Conference

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

NUMERICAL SIMULATION OF DROPLET IMPACTING ON CHEMICALLY STRIPED PATTERNED SUBSTRATE

Hong Wang
Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400030, China; Institute of Engineering Thermophysics, Chongqing University, Chongqing 400030, China

Lei Zou
Institute of Engineering Thermophysics, Chongqing University, Chongqing 400030, China

Xun Zhu
Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400030, China; Institute of Engineering Thermophysics, Chongqing University, Chongqing 400030, China

Yu-Dong Ding
Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Chongqing 400030, China; Institute of Engineering Thermophysics, Chongqing University

Rong Chen
Chongqing University

Qiang Liao
Chongqing University

Abstract

The interaction between liquid phase and solid phase has an important effect on the heat and mass transfer in many heat exchangers or chemical reactors. In the present study, the CLSVOF method was adopted to simulate the dynamic behavior of a water droplet impacting on a chemically striped patterned substrate consisting of alternating hydrophobic and hydrophilic stripes. We investigated the influence of the impact velocity and the point of impact on the dynamic behavior of the droplet. The results showed that even in the lower speed (0.58 m/s), the interval stripe also effectively promoted the droplet break-up and easily formed small separated droplet during the retraction process. Furthermore, the larger velocity was conducive to the droplet break-up, that was contribute to improve the length of the triple-phase contact line, even the solid-liquid contact areas of the different impact velocities were almost equivalent. In addition, the separated droplet appeared relative lower height when they reached the stabilization. It indicated that this kind of splitting ability was beneficial to strengthen the heat and mass transfer process during the evaporation of droplet on the patterned surface with high temperature.

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