COALESCENSE OF DROPLETS IN HIGH-VISCOSITY RHEOLOGICAL LIQUIDS

A step-by-step analysis of the coalescence of normal liquid droplets in a non-Newtonian viscoplastic oil emulsion has been performed. This analysis made it possible to reveal the mechanism and essence of the indicated phenomenon and to construct an algorithm and formulas for calculating the maximum stable size of liquid droplets, their specifi c energy dissipation, the frequency of collisions of droplets, and the thinning of the interphase fi lm of the non-Newtonian liquid between two droplets. It is shown that, in the case of collision of a non-Newtonian liquid droplet with a normal liquid droplet, the non-Newtonian liquid layers on the normal liquid droplet with formation of an adsorption layer on its surface. Analytical solution of the diff usion equation made it possible to obtain expressions for calculating the frequency of collisions of droplets in the non-Newtonian liquid as a function of its parameters and, as a result of the solution of the equations of hydrodynamics, the expression for calculating the thickness of the interphase nonNewtonian liquid fi lm between two droplets has been obtained.
A step-by-step analysis of the coalescence of normal liquid droplets in a non-Newtonian viscoplastic oil emulsion has been performed. This analysis made it possible to reveal the mechanism and essence of the indicated phenomenon and to construct an algorithm and formulas for calculating the maximum stable size of liquid droplets, their specifi c energy dissipation, the frequency of collisions of droplets, and the thinning of the interphase fi lm of the non-Newtonian liquid between two droplets. It is shown that, in the case of collision of a non-Newtonian liquid droplet with a normal liquid droplet, the non-Newtonian liquid layers on the normal liquid droplet with formation of an adsorption layer on its surface. Analytical solution of the diff usion equation made it possible to obtain expressions for calculating the frequency of collisions of droplets in the non-Newtonian liquid as a function of its parameters and, as a result of the solution of the equations of hydrodynamics, the expression for calculating the thickness of the interphase nonNewtonian liquid fi lm between two droplets has been obtained.
Author:  G. I. Kelbaliyev, S. R. Rasulov, M. R. Manafov, F. R. Shykhiyeva, and N. A. Abdullayev
Keywords:  non-Newtonian liquid, droplets, coalescence, energy dissipation, diff usion, interphase fi lm, frequency of collisions, rate of shear, eff ective viscosity, crude oil emulsions
Page:  492