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On the operating temperature of heat pipes

Praful, S and Rao, VP and Vijeth, V and Bhagavath, SV and Seetharamu, KN and Rao, RN (2020) On the operating temperature of heat pipes. In: International Conference on Thermo-Fluids and Energy Systems 2019, Bengaluru.

jou_phy_1473-1_2020.pdf - Published Version

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Official URL: https://doi.org/10.1088/1742-6596/1473/1/012025


The relationship between the operating temperature of heat pipes and the maximum heat transport capacity posed by the heat pipe capillary limit is often overlooked. It is demonstrated through heat pipe experiments that for a given heat input, there exists a minimum temperature for the heat pipe system to operate. This phenomenon occurs due to the temperature dependence of the thermo-physical properties of the working fluid in the heat pipes and the working temperature range of the heat pipe system can thus be discerned by the capillary limit equation in conjunction with the heat pipe transient equation obtained by energy conservation. It may sometimes seem counterintuitive in the sense that if a heat pipe system is aided by a fan (and therefore increase the heat transfer coefficient), then the heat pipes break down and reduce the effectiveness of the thermal management system. This is due to the fact that heat pipes have excessively high effective thermal conductivity and their breakdown leads to heat transfer only through their constituent materials, whose thermal conductivities are lesser by at least an order of magnitude. Heat pipes in a thermal management system must therefore be meticulously designed for precise temperature ranges. © Published under licence by IOP Publishing Ltd.

Item Type: Conference Paper
Publication: Journal of Physics: Conference Series
Publisher: Institute of Physics Publishing
Additional Information: Copyright of this article belongs to Institute of Physics Publishing
Keywords: Capillary flow; Heat transfer; Temperature control; Temperature distribution; Thermal conductivity; Working fluids, Constituent materials; Effective thermal conductivity; Heat transport capacity; Operating temperature; Temperature dependence; Thermal management systems; Thermo-physical property; Working temperatures, Heat pipes
Department/Centre: Division of Mechanical Sciences > Centre for Atmospheric & Oceanic Sciences
Date Deposited: 30 Mar 2021 11:17
Last Modified: 30 Mar 2021 11:17
URI: http://eprints.iisc.ac.in/id/eprint/65117

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