Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : March 18, 2019 - March 19, 2019
In degassing in various kinds of processes, the floating behaviour of the bubble is important. In this study, the floating phenomenon of single bubble in high viscosity liquid was investigated for the degassing in polymerization or food industry. The terminal floating velocity of the bubble which deformed by the rotational Couette flow was measured under the various conditions of viscosity and a shear rate, and the drag coefficient was calculated. The drag coefficient of a bubble was concluded as the Stokes rule by modifying by the cross-sectional area in a floating direction and the aspect ratio of bubble shape. Furthermore, the correlation equation which calculates the cross-sectional area and an aspect ratio based on a shear rate and liquid viscosity was proposed. The floating velocity of the bubbles in high viscosity liquid can be estimated at ±50% by using these formulas.
