曲がり管内脈動流におけるピンガム流体の流動特性 : 実験ならびに数値解析による検討

概要

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The fully developed pulsating laminar flows of an incompressible Bingham plastic fluid through a pipe of circular cross section coiled in a circle were investigated experimentaly and numerically. The flow fields were characterized by the Dean number De, Hedstrom number He, the Womersley number Wo and the curvature ratio δ. The friction factors were measured experimentaly for various volumetric ratio in the case of Wo=4. The calculations were carried out for a fixed He. The flow patterns and the axial velocity profiles were required in the calculations. It was clarified that the effects of the curvature of the pipes appeared easily for Newtonians compared with the plastic fluids. That is, the values of the amplitudes of the friction factor λ_<ac> of the plastic fluid were smaller than that of Newtonians for a range of high Dean number, especially in the case of lower curvature ratio. In the calculations, it was found in the case of a plastic fluids that, in the axial velocity distributions a typical plug flow area appeared near the outer side of the vent in all of a period, and that the strength of the secondary flows were greater than that of Newtonians especially within the period the volumetric rates increased.
社団法人日本機械学会の論文
1992-02-25