Journal ArticleDOI
Non-Steady Flow through a Square-Edged Orifice in a Pipe
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One-dimensional quasi-steady flow theories for flow through an orifice in a pipe are developed in this article, which can be used with wave action calculations using the methods of characteristics.Abstract:
One-dimensional quasi-steady flow theories for flow through an orifice in a pipe are developed. These theories are presented in a form to be used with wave action calculations using the methods of characteristics. Steady flow experiments are described for determining the effective area of the orifice and the location of the plane of the pressure recovery. Non-steady flow tests using a single unit of a pulse generator are described. The results of non-steady flow experiments in the pipe are compared with the calculated pressure diagrams using a quasi-steady flow one-dimensional theory. These showed that the theory may be used for predicting the overall wave action in the pipe. In the plane of the enlargement, downstream of the orifice, the theory did not give an exact prediction of the pressure, particularly with small orifice area to pipe area ratios and high overall pressures. For small pressure changes, however, it is considered that the theory was satisfactory and may be used as the basis for calculati...read more
Citations
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References
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Journal ArticleDOI
A numerical solution of unsteady flow problems
TL;DR: In this article, a method for calculating characteristic diagrams by which the normal position diagram is replaced by a rectangular mesh is discussed, allowing for friction, heat transfer, variable entropy and gradual area changes.