A Study on the Blow-off the Plugged Layer in Pipes

概要

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This paper deals with the requisite air pressure to blow off the plugged granular layer in pipes. A theoretical equation as to the requisite air pressure, associated with the length of the plugged layer in various kinds of pipes, is presented. In experiments polyethylene pellets were used as the plugged granular material, and acrylic straight pipes as well as six kinds of bend pipes, whose inner diameter consisting of 25, 50, 77 and 100mm, were used as test pipes.Experimental results regarding the requisite pressure to blow off the plugged materials in pipes were summarized in the following:(1) Less air pressure was required for the pipe of smaller ratio of curveture radius to the inner diameter.(2) In case of vertically arranged pipes the requisite air pressure was independent of the pipe diameter, whereas highr air pressure is required for the pipes of smaller diameters when pipes are arranged horizontally.(3) The negative pressure operation and the positive pressure operation in the present experiments exhibited similar characteristics concerning the relation between the requisite air pressure and the plugged layer's dimensions.
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