Estimation of thickness of concentration boundary layers by osmotic volume flux determination

Rok, strany: 2011, 186 - 195

The estimation method of the concentration boundary layers thicknesses (δ) in a single-membrane system containing non-electrolytic binary or ternary solutions was devised using the Kedem-Katchalsky formalism. A square equation used in this method contains membrane transport (Lp, σ, ω) and solution (D, C) parameters as well as a volume osmotic flux (Jv). These values can be determined in a series of independent experiments. Calculated values δ are nonlinearly dependent on the concentrations of investigated solutions and the membrane system configuration. These nonlinearities are the effect of a competition between spontaneously occurring diffusion and natural convection. The mathematical model based on Kedem-Katchalsky equations and a concentration Rayleigh number (RC) was presented. On the basis of this model we introduce the dimensionless parameter, called by us a Katchalsky number (Ka), modifies RC of membrane transport. The critical value of this number well describes a moment of transition from the state of diffusion into convective diffusion membrane transport.

ISO 690:

Jasik-Ślęzak, J., Olszówka, K., Ślęzak, A. 2011. Estimation of thickness of concentration boundary layers by osmotic volume flux determination. In General Physiology and Biophysics, vol. 30, no.2, pp. 186-195. 0231-5882.

APA:

Jasik-Ślęzak, J., Olszówka, K., Ślęzak, A. (2011). Estimation of thickness of concentration boundary layers by osmotic volume flux determination. General Physiology and Biophysics, 30(2), 186-195. 0231-5882.