多孔管への流体の流入

概要

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Recently the arrangement, which makes fluid inhale through numerous small holes bored on a pipe wall, is often used in the textile industry. The authors treated the problem regarding the flow of gases inhaled through a number of small holes bored on the transverse sections existing at optional intervals along a straight pipe, and researched the discharge or pressure distribution along a pipe axis theoretically and experimentally. We used a brass pipe having the smooth inside, and bored small holes in two lines symmetrically at the opposite sides of the pipe axis, ten on each side, with equal interval. These small holes were set up to be arranged in single or double rows or zigzag, by properly opening and closing some of them, and we made the air inhale into it through the opaned holes with four gradations of the different inhaling pressures. We measured the pressures on each transverse section having small holes, and total discharges of the inhaled air through each hole, by using water manometer and orifice flowmeter respectively. In theoretical treatment of such flow, on the other hand, we used the momentum theory and energy equations. By means of these methods we calculated the inhaled discharge through each hole, and the pressures on each transverse section having them. The values gained by this calculation are, we believe, conformable to the result of the experiment to a great extent.