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Non-Dimensional Analysis for the Fluid Flow in the Flat Heat Pipes

[+] Author Affiliations
Mohammed T. Ababneh, Frank M. Gerner

University of Cincinnati, Cincinnati, OH

Paper No. HT2013-17035, pp. V003T10A014; 9 pages
  • ASME 2013 Heat Transfer Summer Conference collocated with the ASME 2013 7th International Conference on Energy Sustainability and the ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology
  • Volume 3: Gas Turbine Heat Transfer; Transport Phenomena in Materials Processing and Manufacturing; Heat Transfer in Electronic Equipment; Symposium in Honor of Professor Richard Goldstein; Symposium in Honor of Prof. Spalding; Symposium in Honor of Prof. Arthur E. Bergles
  • Minneapolis, Minnesota, USA, July 14–19, 2013
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 978-0-7918-5549-2
  • Copyright © 2013 by ASME


Flat heat pipes (heat spreaders) are similar to cylindrical heat pipes. But they have received significant attention recently because of their advantages over conventional cylindrical heat pipes with regard to their large surface area, isothermal heat delivery, geometry fit. For example, Thermal Ground Planes (TGPs) are flat, thin (less than 3 mm thick) heat pipes which utilize phase change cooling. The goal is to use TGP’s as universal heat spreaders in microelectronic cooling applications. These TGPs will act as a new generation of high-performance, integrated systems to work at a high power density without difficulties from temperature gradients, increased weight, or extra complexity. In addition to being able to dissipate high thermal powers, they have very high effective thermal conductivities and can operate in high adverse gravitational fields due to nano-porous wicks.

This work shows the effect of vapor pressure, wall shear stress and the interfacial shear stress in the liquid pressure of the flat heat pipes and a comparison with CFD results. Also, this paper offers a design for flat heat pipe charts that avoids the effects of vapor pressure, wall shear stress and the wick-vapor interface to the liquid pressure for most well-known working fluids.

Copyright © 2013 by ASME



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