COMPLEX MODEL OF THE EFFICIENCY OF RECTIFICATION PLATES.
3. COUNTERCURRENT MOTION OF PHASES 
IN PARTIAL MIXING OF A LIQUID
V. N. Pavlechko

UDC 66.048.375

A model of mass transfer in the countercurrent motion 
and partial mixing of a liquid on a plate is analyzed. The liquid 
is considered to be consisting of two parts, one of which () 
is totally mixed and the other of which (1 - ) moves 
in the regime of ideal displacement. The intensity of the mixing is 
determined by the relation of these parts. In the model, the compositions 
of the flows on ideal and actual plates at a certain distance h 
for the vapor and h1 for the liquid from the site 
of injection of the phases coincide; the vapor leaving an ideal plate 
and the liquid arriving at it are in equilibrium. The dependences 
of the difference of the concentrations of a highly volatile component 
in the liquid before and after the plate on the efficiency, the flow 
rates of the vapor and the liquid, and the coefficient of equilibrium 
are derived. Particular cases where h = h1 
and h = h1 = 0.5 and where they are equal 
to zero or to unity are analyzed. Corresponding relations of the efficiencies 
are derived. The complex countercurrent model is analyzed with allowance 
for the mixing and for the fields of its application.

Belarusian State Technological University, Minsk, Belarus. 
Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 74, No. 2, pp. 
38-42, March-April, 2001. Original article submitted January 
26, 2000; revision submitted August 21, 2000.

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