On the unsteady-state species separation of a binary liquid mixture in a rectangular thermogravitational column.
This paper investigates the unsteady-state species segregation of binary liquid mixtures in rectangular thermogravitational columns. The analysis leads to a procedure to obtain both molecular and thermal diffusion coefficients from transient separation measurements. Two models are presented: first, an ideal model where buoyancy only depends on temperature and second, a general model where buoyancy also varies with composition. Steady-state measurements are not required regardless of which model is chosen. As a result, the new procedure is faster than steady-state procedures. When either the molecular or thermal diffusion coefficient is known a priori, the other can be obtained without knowledge of fluid properties such as density, viscosity, thermal expansion, and compositional coefficients.
Department of Chemical Engineering, Yale University, P.O. Box 208286 New Haven, Connecticut 06520-8286, USA. kjetil.haugen@yale.edu
Kjetil B
KB
Haugen
Abbas
A
Firoozabadi