Abstract
AbstractHeat transfer phenomena of spherical bubbles in unbounded contaminated power‐law liquids were numerically studied within the framework of a stagnant spherical cap model by solving the governing conservation equations of mass, momentum, and energy using a segregated approach. The governing equations were solved with the semi‐implicit method for pressure‐linked equations. The momentum terms were discretized by quadratic upstream interpolation for convective kinematics. Isotherm contours reveal that the thermal boundary layer becomes thinner with the decreasing power‐law index and/or the stagnant cap angle. The surface Nusselt number distributions indicate a sudden decrease at the leading edge of the stagnant cap and this reduction is found to be a strong function of all pertinent parameters. The average Nusselt numbers of contaminated spherical bubbles rise with the smaller cap angle and/or the lower power‐law index.
Published Version
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