HEAT TRANSFER FROM TUBES FILLED WITH A GRANULAR LAYER 
WITH ACCOUNT FOR ITS THERMAL ANISOTROPY

M. V. Vinogradova and Yu. S. Teplitskii

UDC 532.546

The heat transfer from a tube filled with an infiltrated 
granular layer has been simulated with account for the parallel thermal 
conductivity of this layer at the first-kind and second-kind boundary 
conditions at the outer surface of the tube with the use of the Danckwerts 
conditions. Analytical dependences determining the influence of the 
parallel thermal conductivity of the granular layer on the average 
at its cross section as well as on the heat flow and the heat transfer 
in it have been obtained. Dependences for calculating the active length 
of a heat exchanger are presented.

A. V. Luikov Heat and Mass Transfer Institute, National 
Academy of Sciences of Belarus, 15 P. Brovka Str., Minsk, 220072, 
Belarus. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 79, 
No. 4, pp. 153-164, July-August, 2006. Original article 
submitted July 8, 2005.