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Research Papers: Two-Phase Flow and Heat Transfer

Experimental Study of Linear and Radial Two-Phase Heat Transport Devices Driven by Electrohydrodynamic Conduction Pumping

[+] Author and Article Information
Matthew R. Pearson

Thermal Fluid Sciences Department,
United Technologies Research Center,
East Hartford, CT 06108
e-mail: pearsomr@utrc.utc.com

Jamal Seyed-Yagoobi

Department of Mechanical Engineering,
Worcester Polytechnic Institute,
Worcester, MA 01609
e-mail: jyagoobi@wpi.edu

Contributed by the Heat Transfer Division of ASME for publication in the Journal of Heat Transfer. Manuscript received June 17, 2012; final manuscript received September 5, 2013; published online November 25, 2014. Assoc. Editor: Sujoy Kumar Saha.

J. Heat Transfer 137(2), 022901 (Feb 01, 2015) (9 pages) Paper No: HT-12-1292; doi: 10.1115/1.4025430 History: Received June 17, 2012; Revised September 05, 2013; Online November 25, 2014

Heat pipes are well known as simple and effective heat transport devices, utilizing two-phase flow and the capillary phenomenon to remove heat. However, the generation of capillary pressure requires a wicking structure and the overall heat transport capacity of the heat pipe is generally limited by the amount of capillary pressure generation that the wicking structure can achieve. Therefore, to increase the heat transport capacity, the capillary phenomenon must be either augmented or replaced by some other pumping technique. Electrohydrodynamic (EHD) conduction pumping can be readily used to pump a thin film of a dielectric liquid along a surface, using electrodes that are embedded into the surface. In this study, two two-phase heat transport devices are created. The first device transports the heat in a linear direction. The second device transports the heat in a radial direction from a central heat source. The radial pumping configuration provides several advantages. Most notably, the heat source is wetted with fresh liquid from all directions, thereby reducing the amount of distance that must be travelled by the working fluid. The power required to operate the EHD conduction pumps is a trivial amount relative to the heat that is transported.

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References

Figures

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Fig. 5

Boiling curve for the 4 mm film, no tilt

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Fig. 6

Boiling curve for the 6 mm film, no tilt

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Fig. 7

Boiling curve for the 4 mm film, 14 mm of adverse tilt

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Fig. 4

Boiling curve for the 2 mm film, no tilt

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Fig. 3

Schematic of electrode dimensions and electrical connections

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Fig. 2

Schematic of linear heat transport device

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Fig. 1

Photograph of the two-phase heat transfer device

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Fig. 9

Conceptual drawing of radial heat transport device

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Fig. 8

Boiling curve for the 2 mm film, 9 mm of favorable tilt

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Fig. 10

Simplified differential analysis of mass flow rate in a linear or radial heat transport device

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Fig. 13

Radial heat transport device performance

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Fig. 11

Photograph of assembled circular heat transport device

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Fig. 12

Schematic of radial heat transport device

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Fig. 14

Approximate mean film velocity of radially flowing film

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