Pressure Drop Characteristics of Perforated Plate Filter with Micropores

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  • 多孔板状フィルターの圧力損失特性

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Pressure drop characteristics of micro-perforated plate and Nuclepore filters, which have structures similar to the surface of membrane filters, have been measured in flow regions of turbulent, laminar and rarefied-gas flow, and have been compared with theoretical values calculated on the basis of a single-hole model.<BR>It was found that the pressure drop is expressed by summation of pressure drop of filter inside and that of a negligibly thin perforated-plate filter. Equations to estimate pressure drop in laminar and rarefied gas-flow regions are presented.<BR>In addition, theoretical pressure drops through a perforated plate filter have been compared with theoretical and empirical results for a pipe orifice with the same structure. It has become clear that these are approximately the same, in spite of the fact that one has a pipe wall and the other does not.

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