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Diffusion Coefficient Measurements Under Reduced Gravity Conditions by Means of the Shear Cell Technique. The Impact of Free Surfaces
Authors:Xavier Ruiz  Jordi Pallarés
Affiliation:(1) Department of Mechanical and Manufacturing Engineering, University of Manitoba, 75 A Chancellors Circle, Winnipeg, MB, R3T 5V6, Canada;
Abstract:A recent computational methodology is applied here in order to analyze the impact of free surfaces on the measurement of the interdiffusion coefficients if shear cells are used. Calculations indicate that the above-mentioned impact depends on the intensity of the solutal Marangoni convection but mainly on the number of active Marangoni segments, that is to say, on the extent of the free surface considered. Bulk solutal convection due to reduced gravity levels is not relevant if the gravity vector acts orthogonally to the gradient of concentration.
Keywords:
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