Abstract
In this paper, computational fluid dynamics (CFD) is used to analyze and represent droplet motion in a stationary fluid. Continuity conservation equations involving two-phase flow are solved in the commercial software package Ansys-Fluent that uses the volume-of-liquid (VOF) method to observe the liquid/liquid interface in two- and three-dimensional domains which has proven to be a very effective and valuable tool for studying the phenomenon of a multiphase interaction in zero-gravity condition. The flow is driven by the Marangoni effect caused by temperature differences. This causes the droplet to move from the cooler region to the warmer region. The results show that the scaled velocity of the droplet decreases with the increase of the thermal Marangoni number (Ma<sub>T</sub>), which is consistent with the results of previous experimental observations from the literature. Calculations are performed on cylinders with an inner diameter of Dr &#61; 15, 17.5, 20, 25, 30, 35, 40, 50, 60, and 70 mm keeping the same 10 mm diameter for all calculations. Due to the column-wall effect, the droplet migration rate decreases only when the ratio of column diameter to droplet diameter Dr/db (AR) is less than 2. When Dr/d<sub>droplet</sub> is greater than 2, the effect of column diameter on droplet speed is negligible. No significant distortion in the shape of the droplet was observed and the droplets were spherical for all column widths.
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