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DOI: 10.1615/ICHMT.2008.CHT.2310
7 pages

H. Barrutia
Manufacturing Department of Mondragon University; Loramendi 4, .20500 Mondragon, Spain

M. M. Bou-Ali
Manufacturing Department, MGEP Mondragon Goi Eskola Politeknikoa, Loramendi 4, Apartado 23, 20500 Mondragon, Spain

J. A. Madariaga
Applied Physics Department II. Universidad del Pais Vasco. 48080 Bilbao, Spain

C. Santamaria
Applied Physics Department II. Universidad del Pais Vasco. 48080 Bilbao, Spain


In this paper, the limits of the validity of the FJO theory has been studied both numerically and experimentally. The commercial Solver Fluent® (Fluent Inc.) has been used in this study, as a computational fluid dynamics (CFD) tool. It was used in order to simulate the variation of the steady separation that will take place in a thermogravitational column over a wide range of the product Grashof by Schmidt. The thermogravitational method is used for determining experimentally the thermal diffusion coefficient of binary mixtures, from measures of the separation reached in the stationary state, between the top and the bottom parts of the column. For this study, one of these columns was used to determine the separation of two mixtures of polystyrene diluted in toluene. Both the numerical and experimental results show the validity of the FJO theory, whenever the work conditions satisfy the relation: Gr ·Sc ≤ 1000·A, where A is the aspect ratio between the height of the thermogravitational column and the work gap (annular space): A = L/d.

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