Interaction of two non-coalescing bubbles rising in a non-isothermal self-rewetting fluid

The attractive and repulsive behaviours of a pair initially spherical gas bubbles rising side-by-side in channel with non-uniformly heated walls containing self-rewetting liquid are investigated numerically. surface tension fluid exhibits parabolic temperature dependence well-defined minimum, as opposed to linear (common) fluids whose decreases almost linearly the increasing temperature. It is found that, for low Reynolds numbers, while an isothermal medium, two display behaviour, they attract non-isothermal systems. undergo plastic collision show ‘squeezing relaxing’ whereas then bounce fluid. A regime map demarcating plotted Weber number (We) dimensionless component gradient (M1) space. that remain even high numbers deform considerably case indicating behaviour due lift force generated by thermocapillary stresses not deformation. mechanism underlying observed phenomenon elucidated studying drag forces acting on bubbles, their orientations, flow field around them.