A Study on the Mixing of High-viscosity Liquid

Abstract

(1) Time required for carrying outcomplete mixing was observed of high viscous liquidis various types of mixing impellers. The most homogeneous and speedy mixing was obtained by the use of either of the commonly employed mixers, a ribbon mixer or a screw mixer having a draft tube.(2) In such case, time required for carrying out complete mixing was inversely proportional to the impeller speed, and independent both of liquid viscosity and vessel diameter. In general, complete mixing was mostly attained in three circulations of the liquid.In order to operate various sizes of vessels at the same mixing velocity, geometrically similar impellers should be used and rotated at the equal speed.(3) Number of revolution of a mixing impeller required for carrying out complete mixing and that required for one circulation of liquid remained constant, independent of the impeller speed.(4) Mixing energy was proportional to the liquid viscosity and increased proportionally with the mixing speed.(5) Simplified explanations are given to these experimental results.