MOTION OF SINGLE DROPS IN LINEAR SHEAR FLOWS

摘要

Motions of single silicon oil drops rising in linear shear flows of glycerol-water solutions are measured to investigate the effects of the viscosity ratio K and dimensionless shear rate Sr on drag forces under the conditions of -6.3 ≤ log_M ≤ -4.8, 0.94 ≤ κ ≤ 7.04, 1 < Re ≤ 23 and 3.2 ≤ ω ≤ 6.0 s{sup}(-1), where M is the Morton number and ω the magnitude of the velocity gradient of the continuous phase. As a result, we confirmed that (1) the drag coefficient C{sub}D of a drop in a linear shear flow takes a higher value than the drag coefficient C{sub}(D0) of the same-size drop in a stagnant liquid, (2) C{sub}D/C{sub}(D0) increases with Sr, and (3) the augmentation of C{sub}D becomes large as κ increases.