粘度変化のある管内流れと摩擦撞抗 : 第1報,加熱・冷却時の高粘度油の流れ

概要

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The pipe flow of highly viscous fluid, of which wall is heated or cooled at a constant temperature, was studied theoretically and experimentally in order to determine the frictional resistance of the flow with the viscosity gradient. Measurements were performed for the Reynolds number 20<R_e<850, the Prandtle number 500<R_r<2400 and the temperature difference between the fluid and the wall -40°<ΔT<40℃. The result show that the theoretical analysis, taking into account a local viscosity gradient, gave good agreement with the measurements when the buoyancy effect is small. Also, that the pressure drop in the flow direction is little influenced by the buoyancy and is well predicted by the theory. The pressure drop increases almost linearly in the measured range and the friction coefficient, when the wall is heated or cooled, was expressed by a simple empirical equation. The velocity measurement by Pitot probes in the low velocity range was also carefully examined, and the influence of temperature was determined.
社団法人日本機械学会の論文
1986-01-25