Heat transfer and flow structure through a backward and forward-facing step micro-channels equipped with obstacles

This study presents 2-D simulations of a flow-through sudden expansion/contraction micro-channel with the existence obstacles. The bottom wall is maintained at constant flux, while other walls are adiabatic. Rectangular adiabatic obstacles mounted before expansion region on upper and lower channel used. finite element method was used to discretize equations that govern physical model. Results indicate apparition separate vortex, situated in corner after for low Reynolds numbers. For higher values ratios, vortex separation length increases. obtained results show have considerable effect dynamics flow enhancement heat transfer.