Abstract
This paper presents a numerical study of periodic, developing, laminar, incompressible flow in a straight horizontal tube subject to low frequency oscillations about the vertical diameter at its entrance. The three-dimensional flow field is influenced by the tangential and Coriolis forces and is governed by three independent parameters: the flow Reynolds number Re, the oscillation Reynolds number Reω (based on the tub’s oscillation frequency ω) and the angular amplitude A of the tube’s oscillation. It is characterized by a periodic secondary transverse flow, normally consisting of two symmetrical vortices, and an oscillating axial field. The local friction factor exhibits large variations along the tube;s circumference. Its average value is higher than the corresponding value for stationary tubes, and increases with both Reω and A. At high Reω the tube’s oscillation can induce flow reversal, the limits of this flow reversal have been established in terms of the three governing parameters. Finally, the exi...
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