壁面流動すべりに関する研究 : 粘度測定におけるすべりの影響

概要

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The slippage of the fluid flowing over the wall in a pipe is so minut that it has been overlooked in analyzing the fluid flow. In the case of the wall covered with such a slippery material as Silicone, the change is recognized in the flow rates or the pressure differences. This phenomenon is thought to be caused by the slippage. Therefore, in such a case the Hagen-Poiseuille equation in general use is not applicable to the measurement of the viscosity of the fluid. In this paper, a method of viscosity measurement is proposed, by which viscosity can be measured by the maximum flow velocity, a pressure difference and a flow rate. For the measurement, Laser Doppler Velocimeter is used to measure the maximum flow velocity which is not contact with the fluid; the pressure difference transducer of the variable reluctance type is used to measure the pressure difference; the measuring cylinder is used to measure the flow rate. Using some results of the experiments, the effects of the slippage on viscosity are investigated for the pricise measurement of viscosity.
明治大学の論文