Abstr:Orifice/deflector flow: Difference between revisions
(New page: ==Confined Flows== ===Underlying Flow Regime 4-08=== ===Abstract==== The flow through a sharp-edged orifice plate mounted concentric into a pipe of constant cross-section induces a flow ...) |
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{{UFR|front=UFR 4-08|description=UFR 4-08 Description|references=UFR 4-08 References|testcase=UFR 4-08 Test Case|evaluation=UFR 4-08 Evaluation|qualityreview=UFR 4-08 Quality Review|bestpractice=UFR 4-08 Best Practice Advice|relatedACs=UFR 4-08 Related ACs}} | |||
{{Status|checked=no|by= |date= }} | |||
==Confined Flows== | ==Confined Flows== | ||
===Underlying Flow Regime 4-08=== | ===Underlying Flow Regime 4-08=== | ||
===Abstract==== | ====Abstract==== | ||
The flow through a sharp-edged orifice plate mounted concentric into a pipe of constant cross-section induces a flow contraction and a separation downstream of the orifice plate. The narrowest cross-section of the flow is however not located in the orifice itself, but some distance downstream ( | The flow through a sharp-edged orifice plate mounted concentric into a pipe of constant cross-section induces a flow contraction and a separation downstream of the orifice plate. The narrowest cross-section of the flow is however not located in the orifice itself, but some distance downstream (Figure 1). The region of the narrowest cross-section is often called “vena contracta”. Further downstream of this location the flow expands again up to the pipe cross-section. Naturally, such a flow configuration is associated with a considerable pressure loss, since a great deal of kinetic energy is dissipated within the recirculation region. Therefore, such an orifice plate is often used as a flow meter mounted into a pipe (Hayward 1979). For such an application normally a special design of the orifice hole is used and the pressure tapings should be mounted at a certain distance with respect to the orifice location (Figure 2). | ||
[[Image:UFR4-08.jpg|centre|thumb| | [[Image:UFR4-08.jpg|centre|thumb|500px|'''Figure 1.''' Illustration of the flow structure through a pipe with a sharp-edge orifice plate.]] | ||
[[Image:UFR4-08_a.jpg|centre|thumb| | [[Image:UFR4-08_a.jpg|centre|thumb|500px|'''Figure 2.''' Different designs of the orifice plates used for flow meters.]] | ||
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''Contributors: Martin Sommerfeld - Martin-Luther-Universitat Halle-Wittenberg'' | ''Contributors: Martin Sommerfeld - Martin-Luther-Universitat Halle-Wittenberg'' | ||
{{UFR|front=UFR 4-08|description=UFR 4-08 Description|references=UFR 4-08 References|testcase=UFR 4-08 Test Case|evaluation=UFR 4-08 Evaluation|qualityreview=UFR 4-08 Quality Review|bestpractice=UFR 4-08 Best Practice Advice|relatedACs=UFR 4-08 Related ACs}} | |||
Latest revision as of 11:51, 14 January 2022
Confined Flows
Underlying Flow Regime 4-08
Abstract
The flow through a sharp-edged orifice plate mounted concentric into a pipe of constant cross-section induces a flow contraction and a separation downstream of the orifice plate. The narrowest cross-section of the flow is however not located in the orifice itself, but some distance downstream (Figure 1). The region of the narrowest cross-section is often called “vena contracta”. Further downstream of this location the flow expands again up to the pipe cross-section. Naturally, such a flow configuration is associated with a considerable pressure loss, since a great deal of kinetic energy is dissipated within the recirculation region. Therefore, such an orifice plate is often used as a flow meter mounted into a pipe (Hayward 1979). For such an application normally a special design of the orifice hole is used and the pressure tapings should be mounted at a certain distance with respect to the orifice location (Figure 2).
Contributors: Martin Sommerfeld - Martin-Luther-Universitat Halle-Wittenberg