Criterion for Transition of a Liquid Flow to a Dispersion Flow

Abstract

Interlayers between two solid surfaces determine behavior and properties of quite a number of systems: wetting powder, soil and ground, dispersed polymer & mineral binder. Model experiments show two types of interlayer deformation between moving solid surfaces: with very high or very low interlayer deformation velocities. In dynamic interlayer deformation (high velocity) discontinuity, i.e. liquid dispersion, always takes place. Transition from turbulent liquid flow to dispersion takes place when deformation velocity has a certain critical value. Capillarity number Ca = [sgrave]/η may be considered as the limit velocity of liquid deformation without discontinuity. The ratio of actual liquid interlayer deformation velocity W to the limit velocity, multiplied by geometrical coefficient is the criterion (W/Ca). L of liquid deformation or dispersion conditions.

Key Words:

• Liquid flow
• high deformation rate
• instability
• dispersion.