Pulsating Flow through a Pipe Orifice : 2nd Report, Flow Patterns and Wall Shear Stress
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Pulsating flow through an orifice in a circular pipe is investigated by flow visualization method. Aluminium powder is suspended in a fluid. The movements of many particles are traced by taking a photograph exposed for a certain period of time. Various flow patterns are presented as the functions of Reynolds number, Strouhal number and time. Numerical solutions of Navier-Stokes equation are obtained and compared with the experimental results. It is confirmed that the calculated streamline patterns well coincide with the experimental ones. The behavior of wall shear stress is also investigated both numerically and experimentally considering the interaction between the shear stress and the flow pattern. It is made clear that the wall shear stress is very large closely behind the orifice, and that it is due to the motion of eddies (vortices).
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