Collect. Czech. Chem. Commun. 1987, 52, 913-928

Simultaneous measurement of film thickness and wall shear stress in wavy flow of non-Newtonian liquids

Václav Sobolík, Ondřej Wein and Jan Čermák

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


The film thickness and wall shear stress were measured simultaneously by electrodiffusional and capacitance methods. Experimental data were confronted with the existing theories of gravity flow of non-Newtonian liquids in wavy films with free surface.