Study on microfluid flow characteristic can be useful for most practical engineering application such as flows in inkjet printhead, drug delivery devices and microthermal technologies. Hence, in this paper, simulation of microfluid flow in Backward Facing Step (BFS) microchannel has been performed to visualize the flow characteristic at the step region. The microchannel used in this simulation has a step with a step height of 25% from the outlet height. The simulation has been carried out for various Reynolds numbers ranging from 0.1 to 500. The simulations result shows a recirculation zone is appeared at the edge of step for Reynolds numbers of 100, 300 and 500. Moreover, the radius of recirculation is increased further for the further increment of Reynolds numbers. Ansys CFX 11.0 software is used to perform the simulation.
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