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Heat Pipe Science and Technology, An International Journal

ISSN Print: 2151-7975
ISSN Online: 2151-7991

Archives: Volume 1, 2010 to Volume 8, 2017

Heat Pipe Science and Technology, An International Journal

DOI: 10.1615/HeatPipeScieTech.2012004170
pages 1-22

EFFICIENCY OF ROUND POROUS CHANNELS IN TRANSITION REGIME FLUID COOLANT FLOW UNDER FIRST-KIND BOUNDARY CONDITIONS

Anatoly P. Lukisha
Department of Mine Energy Complexes, Polyakov Institute of Geotechnical Mechanics, National Academy Science of Ukraine, 2a Simferopol'skaya Str., Dnipropetrovsk, 49005, Ukraine

ABSTRACT

An important problem in the development of thermal power engineering today is the development of compact, highly efficient heat exchangers. High efficiency of heat exchangers can be achieved with the help of porous materials with high thermal conductivity. Along with the obvious advantage−high efficiency of heat transfer due to high thermal conductivity of porous material, compared to the thermal conductivity of coolant in the channels with smooth wall−there is also a disadvantage: high hydraulic resistance of porous structures. The purpose of this work was to discover the range of parameters of porous heat exchangers, where gain in heat transfer would exceed losses in hydraulics. Smooth-wall pipe was taken as a standard surface for comparison. Computation of comparative efficiency was carried out for porous materials made from metal-felt at a transition regime of a flow of an incompressible fluid (water) under boundary conditions of the first kind. The analysis showed that the maximal positive effect in the efficiency of porous channels is reached at (1) a small diameter of the channel (about 3 mm); (2) Reynolds number in a transition regime of the flow in the compared channel with a smooth wall (Resm ~ 4000); (3) values of porosity about 0.8−0.9; and (4) relative length of a channel with a smooth wall (about 20).


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