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Gas-liquid two phase flow through a vertical 90 degrees elbow bend

Spedding, P. L. and Benard, Emmanuel Gas-liquid two phase flow through a vertical 90 degrees elbow bend. (2007) Experimental Thermal and Fluid Science, vol. 31 (n° 7). pp. 761-769. ISSN 0894-1777

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Official URL: http://dx.doi.org/10.1016/j.expthermflusci.2006.08.003

Abstract

Pressure drop data are reported for two phase air water flow through a vertical to horizontal 90 degrees elbow bend set in 0.026 in i.d. pipe. The pressure drop in the vertical inlet tangent showed some significant differences to that found for straight vertical pipe. This was caused by the elbow bend partially choking the inflow resulting in a build-up of pressure and liquid in the vertical inlet riser and differences in the structure of the flow regimes when compared to the straight vertical pipe. The horizontal outlet tangent by contrast gave data in general agreement with literature even to exhibiting a drag reduction region at low liquid rates and gas velocities between 1 and 2 m s-1. The elbow bend pressure drop was best correlated in terms of l(e)/d determined using the actual pressure loss in the inlet vertical riser. The data showed a general increase with fluid rates that tapered off at high fluid rates and exhibited a negative pressure region at low rates. The latter was attributed to the flow being smoothly accommodated by the bend when it passed from slug flow in the riser to smooth stratified flow in the outlet tangent. A general correlation was presented for the elbow bend pressure drop in terms of total Reynolds numbers. A modified Lockhart-Martinelli model gave prediction of the data.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://wwww.sciencedirect.com The original PDF of the article can be found at Experimental Thermal and Fluid Science website: http://www.sciencedirect.com/science/journal/08941777
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE
Other partners > Queen's University Belfast (UNITED KINGDOM)
Laboratory name:
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Deposited By:Emmanuel Benard

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