Transient force and free convection along a vertical wavy surface in micropolar fluids

This work studies the transient behavior of the laminar mixed convection in micropolar fluid flow over a vertical wavy surface. Effects of micropolar parameters and wavy geometry on the transient skin friction coefficient and Nusselt number are examined. Results show that the transient skin-friction coefficient and heat transfer rate show a mixture of two harmonics. Forced convection dominates the first harmonic at smaller time or near the leading edge, while free convection dominates the second harmonic as the time increases and fluid moves downstream. As the vortex viscosity increases the Nusselt number decreases, thus micropolar fluids have smaller heat transfer rates.