An experimental feasibility study on EHD-assisted capillary pumped loop (CPL)

Details An experimental feasibility study on EHD-assisted capillary pumped loop (CPL) An experimental feasibility study on EHD-assisted capillary pumped loop (CPL)

Jan 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aipc..387..567o&link_type=abstract

Space technology and applications international forum (STAIF - 97). AIP Conference Proceedings, Volume 387, pp. 567-572 (1997).

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Heat Flow In Porous Media

Scientific paper

The capillary pumped loop (CPL) is a passively pumped two-phase heat transport device that has demonstrated performance capabilities up to an order of magnitude greater than heat pipes, which are the current state-of-art. CPL technology has been developed to a near ready state for use as a thermal control device for advanced spacecraft systems. To further improve CPL performance, on a system level, the pumping head generated within the wick material must be enhanced. Utilizing the effect of a phenomenon known as liquid extraction (or EHD pumping); the Electrohydrodynamic (EHD) technique can effectively improve the liquid pumping capacity in a CPL system. EHD uses an electric field that can collect, guide, and pump liquid to the evaporating surface. This paper presents an experimental investigation of the feasibility of using EHD technology for improving CPL performances. The experimental study included EHD-enhanced pumping across a felt material that simulated a CPL wick. The results show more than 80% increase in heat transfer coefficients at the evaporator wick, with R-123 as the working fluid. Calculations, using the experimental data, demonstrate substantial increase in the corresponding additional pressure head developed across the wick through EHD effects.

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