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The design and analysis of gas-flow systems are complicated due mainly to pressure-induced variations in the gas-stream density and velocity. Here, we review practical principles and present some key equations governing gas flow, and assess several rules of thumb that engineers sometimes apply in order to simplify gas-flow analysis and calculations. Flow can be categorized as either incompressible or compressible, depending on the amount of pressure change the gas undergoes, as well as on other conditions. Calculating truly compressible flow in pipe systems is a formidable task. Accordingly, engineers often apply rules of thumb to a given design situation involving gas flow, to decide whether the use of incompressible-flow calculations can be justified. A purpose of this article is to offer guidelines for assessing the importance of compressibility effects in a given case. The methods discussed in this article can help the engineer assess endpoint sonic choking, but restriction and expansion choking are somewhat more complicated. Accordingly, the estimation methods in this article may not be applied to all choking situations.
The design and analysis of gas-flow systems are complicated due mainly to pressure-induced variations in the gas-stream density and velocity. Here, we review practical principles and present some key equations governing gas flow, and assess several rules of thumb that engineers sometimes apply in order to simplify gas-flow analysis and calculations. Flow can be categorized as either incompressible or compressible, depending on the amount of pressure change the gas undergoes, as well as on other conditions. Calculating truly compressible flow in pipe systems is a formidable task. Accordingly, engineers often apply rules of thumb to a given design situation involving gas flow, to decide whether the use of incompressible-flow calculations can be justified. A purpose of this article is to offer guidelines for assessing the importance of compressibility effects in a given case. The methods discussed in this article can help the engineer assess endpoint sonic choking, but restriction and expansion choking are somewhat more complicated. Accordingly, the estimation methods in this article may not be applied to all choking situations.
Gas-flow calculations: Don't choke
Berechnungen von Gasströmen: Drossele nicht
Walters, T. (author)
Chemical Engineering, New York ; 107 ; 70-76
2000
7 Seiten, 10 Bilder, 9 Quellen
Article (Journal)
English
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