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Heat Transfer Research

Impact factor: 0.078

ISSN Print: 1064-2285
ISSN Online: 2162-6561

Heat Transfer Research

DOI: 10.1615/HeatTransRes.v38.i6.70
pages 553-563

Experimental Studies of Heat-Transfer Characteristics of Miniaturized Heat Pipes

V. Yu. Kravets
National Technical University of Ukraine ''Kiev Polytechnical Institute'', Kiev, Ukraine
Yu. E. Nikolaenko
Ministry of Industrial Policy, Ukraine
Ya. V. Nekrashevich
National Technical University of Ukraine "Kiev Polytechnical Institute", Kiev, Ukraine

ABSTRACT

Results of studies of heat-transfer characteristics of miniaturized heat pipes with the diameter 2.4 and 6 mm and length from 50 to 250 mm are presented. Pipe shell material is copper. It is shown that decrease of the vapor space dimensions in heat pipes leads to deterioration of their heat-transfer properties (increase of thermal resistance, reduction of transferred heat fluxes, and increase of the temperature difference between the evaporator and the condenser). The thermal resistance value depends on the diameter of miniaturized heat pipes. Physical processes occurring in miniaturized heat pipes are analyzed; heat-transfer coefficients in evaporation and condensation zones are obtained. Dependences of transferred heat loads on the diameter of the vapor space and the total length of miniaturized heat pipes are given. Dependences of the temperature drop between evaporation and condensation zones on the transferred heat flux are presented. Possibilities for increase of heat-transfer characteristics of such heat pipes by application of optimal-structure capillary structures, possessing a high capillary pressure and a high liquid permeability, are analyzed.