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Interfacial Phenomena and Heat Transfer
ESCI

ISSN Druckformat: 2169-2785
ISSN Online: 2167-857X

Open Access

Interfacial Phenomena and Heat Transfer

DOI: 10.1615/InterfacPhenomHeatTransfer.2016013392
pages 231-242

EFFECT OF AMBIENT AIR FLOW ON THERMOCAPILLARY CONVECTION IN A FULL-ZONE LIQUID BRIDGE

Masaki Kudo
Mechanical Systems Engineering Program, Monozukuri Engineering Department, Tokyo Metropolitan College of Industrial Technology, 10-40, Higashi-oi 1-chome, Shinagawa City, Tokyo, 140-0011, Japan
Yuuki Akiyama
Mechanical Systems Engineering Program, Monozukuri Engineering Department, Tokyo Metropolitan College of Industrial Technology, 10-40, Higashi-oi 1-chome, Shinagawa City, Tokyo, 140-0011, Japan
Shogo Takei
Mechanical Systems Engineering Program, Monozukuri Engineering Department, Tokyo Metropolitan College of Industrial Technology, 10-40, Higashi-oi 1-chome, Shinagawa City, Tokyo, 140-0011, Japan
Kosuke Motegi
Department of Mechanical Engineering, Faculty of Science & Technology, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba, 278-8510, Japan
Ichiro Ueno
Department of Mechanical Engineering, Faculty Science & Technology Tokyo University of Science 2641 Yamazaki, Noda, Chiba 278-8510, Japan

ABSTRAKT

The effect of ambient airflow on flow-transition points in thermocapillary convection was investigated using a floating-zone method (full-zone liquid bridge) with a high Prandtl number fluid (Pr = 28.1) under normal gravity conditions. In the liquid bridge, convection changes from two-dimensional steady flow to three-dimensional unsteady flow at a flow-transition point. A pair of partition plates was employed to suppress the ambient airflow. To understand the flow and thermal fields of the ambient air, flow was visualized using smoke and temperature was measured using a thermocouple. Thermocapillary convection was stabilized by suppressing ambient air flow. The primary stabilization factor is heat transfer from the ambient air to the liquid bridge through the free surface. These results suggest that flow-transition point was controllable by modifying ambient air temperature.


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