Measurement of wall friction by a relaxation of diffusion method
Abstract
The paper examines the Newtonian or nonNewtonian flow of a heterogeneously reacting fluid at a wall. The chemical reaction is constrained by the diffusion of the reactant whose concentration in the solution is low. The fluid is isothermal with constant physical properties; the flow is steady and the Schmidt number is greater than one. One, two and threedimensional flows are considered. An experiment was performed to observe the relative concentration of the solution (in this case potassium ferricyanide), the relaxation of diffusion, and wall friction of a flow initiated by the rotation of a disk with rough surfaces. The setup consisted of microelectrodes distributed in the inactive zone of the disk at different distances from the disk center.
 Publication:

Academie des Sciences Paris Comptes Rendus Serie B Sciences Physiques
 Pub Date:
 May 1976
 Bibcode:
 1976CRASB.282..377M
 Keywords:

 Newtonian Fluids;
 Nonnewtonian Flow;
 Relaxation (Mechanics);
 Skin Friction;
 Turbulent Diffusion;
 Wall Flow;
 Chemical Reactions;
 Isothermal Flow;
 Laminar Flow;
 One Dimensional Flow;
 Rotating Disks;
 Schmidt Number;
 Surface Diffusion;
 Surface Roughness;
 Three Dimensional Flow;
 Two Dimensional Flow;
 Fluid Mechanics and Heat Transfer