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Energies 2015, 8(4), 2337-2357; doi:10.3390/en8042337

Sintered Nickel Powder Wicks for Flat Vertical Heat Pipes

Department of Energy and Process Engineering, Norwegian University of Science and Technology, Kolbjørn Hejes vei 1a, 7491 Trondheim, Norway
These authors contributed equally to this work.
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Academic Editor: Enrico Sciubba
Received: 12 January 2015 / Revised: 26 February 2015 / Accepted: 16 March 2015 / Published: 25 March 2015
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Abstract

The fabrication and performance of wicks for flat heat pipe applications produced by sintering a filamentary nickel powder has been investigated. Tape casting was used as an intermediate step in the wick production process. Thermogravimetric analysis was used to study the burn-off of the organic binder used and to study the oxidation and reduction processes of the nickel. The wicks produced were flat, rectangular and intended for liquid transport in the upwards vertical direction. Rate-of-rise experiments using heptane were used to test the flow characteristics of the wicks. The wick porosities were measured using isopropanol. The heat transfer limitation constituted by the vapour static pressure and the capillary pressure was discussed. The influence on wick performance by using pore former in the manufacturing was studied. When Pcap/Psat > 1, the use of a pore former to increase the wick permeability will always improve the wick performance. When Pcap/Psat < 1, it was shown that if the effective pore radius and the permeability increase with an equal percentage the overall influence on the wick capacity is negative. A criterion for a successful pore former introduction is proposed and the concept of a pore former evaluation plot is presented. View Full-Text
Keywords: wick; sintering; pore former; rate-of-rise; heat pipe wick; sintering; pore former; rate-of-rise; heat pipe
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Hansen, G.; Næss, E.; Kristjansson, K. Sintered Nickel Powder Wicks for Flat Vertical Heat Pipes. Energies 2015, 8, 2337-2357.

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