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Updated: Jun 21, 2026

Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions
Published on: February 22, 2018
A numerical study of the hydrodynamic stable concentration boundary layers in a membrane system under
Andrzej Slezak1, Arkadiusz Bryll, Sławomir Grzegorczyn
1Department of Biophysics, Czestochowa University of Technology, 42200 Czestochowa, Poland. ajslezak@zim.pcz.czest.pl
Abstract:
On the basis of the classic formula of the concentration Rayleigh number and the Kedem-Katchalsky equation for diffusive membrane transport, we derived the equations of sixteenth order which show the dependence of the thicknesses of the concentration boundary layers on the difference of the solution concentrations, the concentration Rayleigh number, the solute permeability coefficient of the membrane and the diffusion coefficients in the solution, the kinematic viscosity of the solution, the density of solutions, the temperature and gravitational acceleration. The obtained equation has numerical solutions in the first, third and fourth quadrant of a co-ordinate system. However, only two solutions from the first quadrant of the co-ordinate system have physical meaning. Confining ourselves to the set of solutions with physical meaning only, the thicknesses of concentration boundary layers for different parameters occurring in the obtained equation were calculated numerically.
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