Unsteady friction modelling in transient pipe flow simulation

• Autorzy: Adamkowski A. , Lewandowski M.
• Języki publikacji: EN

Abstrakty

EN

The paper presents comparative analysis of unsteady pressure course calculation in closed conduits using selected hydraulic resistance models incorporating quasi-steady and unsteady friction models. Calculation was carried out for laminar and turbulent initial flows as tested by E. L. Holmboe and W. T. Rouleau. The results enabled qualitative and quantitative assessment of methods used to calculate friction losses. The assessment has confirmed that the commonly applied method of hydraulic resistance calculation (compatible with the quasi-steady flow hypothesis) does not guarantee satisfactory agreement between calculated and recorded hydraulic transients. It has been proven that the unsteady friction models based on weighting function of past flow velocity changes show superiority over models based on assumption that the portion of energy losses related to flow unsteadiness is proportional to the first derivative of liquid velocity.

Słowa kluczowe

EN

friction modelling; hydraulic transients in pipes; pressure wave propagation

• Wydawca: Wydawnictwo Instytutu Maszyn Przepływowych PAN
• Czasopismo: Transactions of the Institute of Fluid-Flow Machinery
• Rocznik: 2004
• Tom: nr 115
• Strony: 83--97
• Opis fizyczny: Bibliogr. 20 poz., rys., tab.

Twórcy

autor

Adamkowski A.

• The Szewalski Institute of the Fluid Flow Machinery of the Polish Academy of Sciences 80-952 Gdańsk, ul J, Fiszera14, PO Box 627, Poland

autor

Lewandowski M.

• The Szewalski Institute of the Fluid Flow Machinery of the Polish Academy of Sciences, 80-952 Gdańsk, ul J, Fiszera 14, PO Box 627, Poland

Bibliografia

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