COOLING OF A PLANE-PARALLEL DISPERSE LAYER
A. P. Ivanov and E. I. Vitkin

UDC 536.33

In a continuation of previous works, in which the 
kinetics of heating of a plane-parallel light-diffusing layer was 
studied by numerical solution of differential equations of radiation 
transfer and heat conduction, we consider the process of cooling of 
an initially uniformly heated layer. Examples are presented for different 
optical and thermophysical characteristics. We suggest the concepts 
of the characteristic times determining which one can estimate a number 
of specific parameters of the processes of cooling of a medium without 
resorting to solution of differential equations. We have obtained 
a simple analytical solution of the problem for the case where the 
layer remains uniformly heated during the whole process of cooling. 
It is shown that under certain conditions the ratio of the volume 
concentration of particles in the medium to their diameter can be 
calculated from the rate of cooling.

B. I. Stepanov Institute of Physics, National Academy 
of Sciences of Belarus, Minsk, Belarus. 
Translated from Inzhenerno-Fizicheskii 
Zhurnal, Vol. 75, No. 1, pp. 122-127, January-February 2002. 
Original article submitted May 14, 2001.

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