EXPERIMENTAL INVESTIGATIONS OF HEAT AND MASS TRANSFER IN MICROCHANNEL HEAT-TRANSFER ELEMENTS

The present work seeks to develop and investigate experimentally microchannel heat-exchange apparatuses of two designs: with porous elements manufactured from titanium and copper, and also based on the matrix of filamentary silicon single crystals under operating conditions with high heat loads, unsteadiness, and nonlinear fl ow of the coolant. For experimental investigations, the authors have developed and manufactured a unique test bench allowing tests of the developed heat-transfer elements in unsteady operating regimes. The performed experimental investigations have made it possible to obtain criterial dependences of the heat-transfer coeffi cient on the Reynolds and Prandtl numbers and to refi ne the values of viscous and inertial coeffi cients. It has been established that microchannel heat-transfer elements based on silicon single crystals, which make it possible to remove a heat fl ux above 100 W/cm² , are the most efficient. For porous heat-transfer elements, the best result was attained for wedge-shaped copper samples. According to investigation results, the authors have considered the issues of optimization of thermal and hydraulic characteristics of the heat-transfer elements under study. In the work, the authors have given examples of practical use of the developed heat-transfer elements for cooling systems of radioelectronic equipment.
   
Author:  D. A. Konovalov
Keywords:  microchannel element, porous element, silicon single crystals, cooling system, test bed
Page:  636