Collect. Czech. Chem. Commun. 1981, 46, 2842-2853

Wavy flow along oscillating wall

Václav Sobolík and Jiří Drahoš

Institute of Chemical Process Fundamentals, Czechoslovak Academy of Sciences, 165 02 Prague 6-Suchdol


A capacitance probe for the measurement of a local liquid film thickness was developed and tested. Characteristics of wavy flows of Newtonian (glycerol) and non-Newtonian liquids (aqueous solution of carboxymethylcellulose and kaolin suspension in water) along a vertical wall were measured by the probe. Attention was also devoted to the influence of wall oscillations upon waves on the film surface. The measured data on wavy flow of glycerine and partially also on carboxymethylcellulose (flow behaviour index n = 0.86) were in a good agreement with Kapitsa theory based, besides others, on the assumption of the sine shape of waves. However the theory cannot be used even as the first approximation for description of wavy flow of kaolin suspension (n = 0.14).