NUMERICAL STUDY OF FLUID MOTION IN THE ENTRANCE REGION OF A STRAIGHT TUBE DURING OSCILLATORY FLOW(Flow Control 2)

概要

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Numerical solutions were presented of an oscillatory laminar flow in the entrance region of a straight tube installed perpendicularly to the wall of a large reservoir. The velocity profiles and the distributions of the wall shearing stress were illustrated for a representative flow with Womersley number α=5.5 and Reynolds number Re=500. Entrance-flow phenomena were discussed, including the flow induced in the reservoir. In the vicinity of the entrance, the flow in the outflow phase assumes a velocity feature similar to that for a fully developed region. On the other hand, the flow in the inflow phase shows a complicated behavior that is closely related to the streaming induced in the reservoir in the preceding outflow phase. The velocity profiles along the tube axis change greatly in a section of about 10% of Re/α^2 from the entrance. The inlet length based on the amplitude value of the axial velocity is appreciably shorter than that for a steady flow with the same Reynolds number and is roughly proportional to Re/α^2.
一般社団法人日本機械学会の論文
2005-10-05