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Heat Transfer Research
Fator do impacto: 1.199 FI de cinco anos: 1.155 SJR: 0.267 SNIP: 0.503 CiteScore™: 1.4

ISSN Imprimir: 1064-2285
ISSN On-line: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2020033175
Forthcoming Article

Marangoni Convection around a Micro Bubble Attached to Locally Heated Channel Wall

Kazuya Tatsumi
Kyoto University
Takaya Atsumi
Kyoto University
Kyoko Namura
Kyoto University
Reiko Kuriyama
Kyoto University, Kyotodaigaku-katsura, Nishikyo-ku, Kyoto 615-8540, Japan
Motofumi Suzuki
Kyoto University
Kazuyoshi Nakabe
Department of Mechanical Engineering and Science, Kyoto University; Advanced Research Institute of Fluid Science and Engineering, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto 606-8501, Japan

RESUMO

Flow and thermal characteristics of the Marangoni convection (thermo-capillary flow) around a micro-bubble are described in this study for the case of the bubble attached to the microchannel wall and the wall heated locally (hot spot applied). By providing heat source near the bubble and generating temperature gradient on the bubble surface Marangoni convection can be produced in the surrounding fluid. In micro-scale this effect is significant and strong vortices and streaming flow can be formed in the channel. We investigate the effects of the hot spot location on the temperature field and vortex structure based on the numerical simulation. Circulating flow is generated when the hot spot is located at the center of the bubble, while a pair of strong vortices appears in the case when the position of the hot spot moves away from the center position. Further, we evaluate the effect of the heat conduction and temperature dependency of the fluid viscosity on the temperature field and resulting Marangoni convection. To compare the present results with the measurement visualizing the flow by using particles, we solve the equation of motion of the particles and evaluate the contribution rate of each force term. The results show that the trajectory of the particle basically follow the streamline but can deviate from it for a certain degree at the location where the streamline curvature is large.