Abstract
We present a numerical study of the thermal migration of a compound droplet attached to a horizontal substrate. The different constant temperatures are applied to the left and right boundaries of the computational domain. The compound droplet contains one inner core. The problem is solved by using a front-tracking technique associated with the finite difference method. The investigated parameters include the radius ratio (Rio) of the inner droplet and the equivalent radius of the outer droplet (Rio varied in the range of 0.2 to 0.7), the viscosity ratio (μom) of the outer to middle fluids (μom varied in the range of 0.1 to 2.4), and the static contact angle θe (θe varied in the range of 60° to 120°). The results reveal that the inner droplet drives the compound droplet towards the hot region as its radius is sufficiently large (Rio≥ 0.6). The compound droplet moves towards the cold region as the value of Rio is less than 0.6. Increasing the viscosity of the outer fluid (by increasing μom) or θe causes the compound droplet to move towards the hot region. The trajectory of the centroid of the inner droplet is also investigated.
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