Journal of Engineering Physics and Thermophysics
is a translation of Inzhenerno-fizicheskii Zhurnal,
a publication of the  Academic Scientific Complex 
	"A. V. Luikov Heat and Mass Transfer Institute"
of the National Academy of Sciences of Belarus
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A MATHEMATICAL MODEL OF EXTRACTION WITH 
A VARIABLE MASS-TRANSFER COEFFICIENT
V. V. Beloborodov and B. A. Voronenko
UDC 66.021.06:531.1
Using the relationship between the sizes of particles 
and the characteristics of their layer, we obtain the 
dependence  of  the mass-transfer coefficient on time 
and concentration; the dependence  is included in the 
third-kind  boundary condition. Using this condition, 
we solve the boundary-value problem of extraction.
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