Mathematical Modeling and Analysis of Heat Pipe Start-Up From the Frozen State

[+] Author and Article Information
J. H. Jang, A. Faghri

Department of Mechanical and Materials Engineering, Wright State University, Dayton, OH 45435

W. S. Chang, E. T. Mahefkey

Wright Research and Development Center, Wright-Patterson, AFB, OH 45433

J. Heat Transfer 112(3), 586-594 (Aug 01, 1990) (9 pages) doi:10.1115/1.2910427 History: Received May 01, 1989; Revised November 11, 1989; Online May 23, 2008


The start-up process of a frozen heat pipe is described and a complete mathematical model for the start-up of the frozen heat pipe is developed based on the existing experimental data. The model is simplified and solved numerically. The two-dimensional transient model for the wall and wick is coupled with the one-dimensional transient model for the vapor flow when vaporization and condensation occur at the interface. A parametric study is performed to examine the effect of the boundary specification at the surface of the outer wall on the successful start-up from the frozen state. For successful start-up, the boundary specification at the outer wall surface must melt the working substance in the condenser before dryout takes place in the evaporator.

Copyright © 1990 by The American Society of Mechanical Engineers
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