每年出版 4 期
ISSN 打印: 2169-2785
ISSN 在线: 2167-857X
Indexed in
INVESTIGATION OF THERMO-CAPILLARY FLOW INSIDE AN EVAPORATING PINNED WATER DROPLET
摘要
Thermo-capillary flow inside an evaporating water drop on heated or non-heated substrate is investigated. The modeling of the internal flow inside the drop takes into account the effects of the privileged evaporation near the contact line as well as thermo-capillarity. Heat transport equations by convection−diffusion in the drop, conduction in both solid and gas phases, and vapor diffusion in the surrounding air are solved numerically in a quasi-steady state. Results showed that the temperature profile at the drop surface rules the patterns of the thermo-capillary flow which is mainly dominant except near the contact line and toward the evaporation end. It is highlighted that the substrate temperature and its thermal conductivity have a great impact on the flow inside the drop. For instance, a multi-cellular pattern is induced within a heated drop for contact angles between 11 and 20° and the thermo-capillary flow could be reversed for contact angles less than 11° under certain conditions of the substrate thermal conductivity. Furthermore, the evaporation rate of the heated drop may be considerably influenced by thermo-capillarity at high contact angles.
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