ASYMMETRIC DROP MARANGONI MIGRATION OF LARGER REYNOLDS-NUMBERS

Two-dimensional and unsteady problems of drop and bubble Marangoni mig ration are calculated for cases of larger Reynolds numbers in the micr ogravity environment. A global treatment method is introduced to solve numerically the complete problem by using the finite differential met hod, and the thermocapillary force acting on the interface is consider ed as a body force acting in the computational mesh elements which are passed by the interface. The program of numerical simulation is check ed with the symmetric model of bubble migration in Ref. [1]. The asymm etric model of bubble migration is calculated, and the results are dif ferent fi om that of the symmetric model. The asymmetric model of drop migration is also calculated. The trajectory of drop in larger Reynol ds number fluid is oscillated periodically due to the vortex separatio n in the wake. (C) 1998 Elsevier Science Ltd. All rights reserved.