Abstract
This paper deals with the effect of the ratio of viscosities of dispersed and continuous phases, μa/μc, on the energy efficiency of agitation. The viscosity ratios used were 0.836, 0.271, 0.0992, 0.0280 and 0.00133. The photographs of drops were taken by a microscopic method and the values of torque were measured with a rotary torque meter. Since, the values of mean diameter and particle size distribution were calculated, and further the energy efficiency of agitation was evaluated. And then, the following results were obtained. (1) When the viscosity ratio μa/μc became smaller than unity, NWe for each revolution number increased more larger values. (2) The energy efficiency of agitation gradually decreased according as the values of dsv became smaller and smaller.
