Transactions of the Japan Society of Mechanical Engineers
Online ISSN : 2185-9485
Print ISSN : 0029-0270
ISSN-L : 0029-0270
Studies on the Characteristics of Radial-Flow Nozzles : 1st Report, Theoretical Analysis of Outward Flow
Tatsuya HAGIWARA
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1962 Volume 28 Issue 186 Pages 138-144

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Abstract

In connection with pneumatic micrometers, the outward flow characteristics of narrowly spaced radial-flow nozzles are studied with analytical methods. Assuming that fluid is incompressible and the velocity distribution in a boundary layer is parabolic, the momentum equation of a laminar boundary layer is solved approximately. Thus it becomes possible to calculate theoretically the inlet length, the velocity distribution in the clearance, the pressures at various radii or the pressure loss of any nozzle. As a corresponding value to Reynolds number, in this case, R=Vh2/vr1, should be used, where h is a breadth of a clearance, r1 is the inner radius of a nozzle and V is a radial mean velocity at r1. Then profiles of pressure and velocity distributions are determined by R only.

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