回転二重同心円筒内流体の吸込みわき出し流れ(流体工学,流体機械)

概要

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Steady Source-sink flows of viscous incompressible fluid in a rotating annulus are numerically studied. The annulus is made of two concentric cylinders of different radius with finite axial length and solid-wall ends. The annulus rotates rigidly with respect to its axis. The fluid is injected uniformly from the inner cylinder and the same amount is extracted uniformly from the outer cylinder. This flow is mainly characterized by the Ekman number (E) and dimensionless speed of extracted fluid (U). When U is small, the injected fluid moves through the annulus via the Ekman layer which is formed near the end walls of the annulus. The ratio of the volume rate of fluid that goes through the Ekman layer is investigated and it is newly found that this ratio can take an extremum value at some intermediate value of U for a fixed value of E. Moreover, we find that, when E and U are very small, the torus flow appears, which was not found in the previous studies.
社団法人日本機械学会の論文
2004-11-25