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An Investigation of Evaporation, Boiling, and Heat Transport Performance in Pulstating Heat Pipe

[+] Author Affiliations
Qingjun Cai, Reh-Lin Chen, Chung-Lung Chen

Rockwell Scientific Company, Thousand Oaks, CA

Paper No. IMECE2002-33334, pp. 99-104; 6 pages
doi:10.1115/IMECE2002-33334
From:
  • ASME 2002 International Mechanical Engineering Congress and Exposition
  • Heat Transfer, Volume 7
  • New Orleans, Louisiana, USA, November 17–22, 2002
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 0-7918-3638-X | eISBN: 0-7918-1691-5, 0-7918-1692-3, 0-7918-1693-1
  • Copyright © 2002 by ASME

abstract

Pulsating heat pipe (PHP) is a latest development in heat pipe technology. In this paper, evaporation and boiling phenomena are investigated, and liquid heat transport performance in a PHP is measured at different fill ratio as well. The observation results show that phase change in the evaporator may occur by two different mechanisms: 1) evaporation and boiling in thin liquid film on the evaporator wall, 2) generation and collapse of tiny bubbles suspended in the liquid slug. Meanwhile, the temperature measurement indicates that temperature gradient between the evaporator and the condenser is related to liquid latent heat, density, viscosity, and mass filled in.

Copyright © 2002 by ASME

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