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International Heat Transfer Conference 13

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

MICROSCALE TWO PHASE HEAT TRANSFER ENHANCEMENT IN POROUS STRUCTURES

Leonid L. Vasiliev, Jr.
Byelorussian Academy of Sciences; and Luikov Heat & Mass Transfer Institute, Porous Media Laboratory, P. Brovka Str. 15, 220072 Minsk, Belarus

A. Zhuravlyov
Luikov Heat & Mass Transfer Institute, Minsk, Belarus

Alexander Shapovalov
Porous Media Laboratory, A. V. Luikov Heat and Mass Transfer Institute, National Academy of Sciences of Belarus, 15 P. Brovka Str., Minsk, 220072, Belarus

L. L. Vasiliev, Jr
Luikov Heat & Mass Transfer Institute, National Academy of Sciences of Belarus, Porous Media Laboratory, P. Brovka Str. 15, 220072 Minsk, Belarus

DOI: 10.1615/IHTC13.p5.220
10 pages

Abstract

Following the literature many investigations have been performed to provide a better understanding of two-phase heat transfer at microscale, which is very important in electronics and optoelectronic components cooling. However, these studies haven't yet leaded to a general conclusion. Recently in the Porous Media Laboratory (Minsk, Belarus) some experiments were carried out encompassed on investigation of mini/micro scale heat transfer of two-phase fluids (propane) at heat flux ranges 102−105 W/m2. Experimental investigation of pool boiling and evaporation heat transfer in mini channels on single horizontal tube (smooth and with porous coating) was performed for the reasons of analysis of its cooling efficiency. The data obtained on a flooded and partially flooded horizontal tube with porous coating in the liquid pool or in confined space (from 0.1 to 2 mm) testify the phenomena of micro heat pipe inside a porous structure. A micro scale effect took place inside the porous body and a mini-scale effect was ensured due to flank or annular mini channel. Cylindrical heat releasing tube with porous surface disposed inside the transparent coaxial glass tube with annular mini channel between has all particularities of micro-scale and mini-scale effects of the heat transfer. Visual analysis and experimental results show, that such combination is favorable for the enhancement of the evaporation and two-phase convection heat transfer. The availability of annular mini channel significantly promotes to intense heat transfer (up to 2.5−3 times as high) at heat fluxes < 50 kW/m2, as compared with process in the liquid pool.

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Measurement of fluid temperature with an arrangement of three thermocouples