Minor losses for oscillating flow in a duct with sudden area change have been investigated through non-linear theoretical analysis, PIV measurement and CFD simulation. The flow filed was analyzed and results from the PIV measurement and CFD simulation were compared. It shows that the CFD simulation is useful for the flow characteristics analysis in oscillating flow. The influence of the four nondimensional parameters namely the dynamic Reynolds number, Reynolds number, the ratio of the area and the phase difference between pressure and velocity on the minor losses has been analyzed by CFD simulation.
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