Measurement of wall friction by a relaxation of diffusion method
Abstract
The paper examines the Newtonian or non-Newtonian 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 three-dimensional 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 set-up 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