RESEARCH PAPERS: Transport Phenomena in Microgravity

Effects of Heating Mode on Steady Axisymmetric Thermocapillary Flows in Microgravity

[+] Author and Article Information
Y. Kamotani, A. Chang, S. Ostrach

Department of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, OH 44106

J. Heat Transfer 118(1), 191-197 (Feb 01, 1996) (7 pages) doi:10.1115/1.2824034 History: Received December 01, 1994; Revised September 01, 1995; Online December 05, 2007


Steady thermocapillary flows in cylindrical containers with unit aspect ratio (radius = depth) are studied numerically and by scaling analysis in order to investigate how the velocity and thermal fields are influenced by the method of heating. Two heating modes are considered: heating by a uniform temperature cylindrical heater placed along the centerline (called the CT heating) and heating by an external radiative source (the CF heating). The steady velocity and temperature fields are computed numerically under various conditions for various Prandtl number fluids. The effects of those two types of heating on the flows are discussed. The results are also found to support the scaling laws derived herein for the characteristic velocity, length, and Nusselt number. The main thermocapillary driving force region is fixed by the heating zone area in the CF heating but it generally varies with the flow in the CT heating.

Copyright © 1996 by The American Society of Mechanical Engineers
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