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ISSN Online: 2377-424X

ISBN Print: 0-85295-345-3

International Heat Transfer Conference 10
August, 14-18, 1994, Brighton, UK

LOCAL PRESSURE DROP AND PRESSURE GRADIENT DURING TWO-PHASE FLOW IN HORIZONTAL PIPES

Get access (open in a dialog) DOI: 10.1615/IHTC10.5430
pages 151-156

Resumo

This paper reports local pressure drop attributable to a sudden area contraction and pressure gradient in straight horizontal pipes during air-water two-phase flow. The data refer to sudden area contractions with downstream/upstream area ratios equal to 0.16 and to 0.56 and to straight pipes of diameter equal to 0.04, 0.06 and 0.1 m. The experimental results show two different behaviours. One is characterized by a monotonic trend of the dimensionless singular pressure drop as a function of the gas fraction of volume flow and permits the comparison of the data with the predictions of models available in the literature and with those of a model, based on simple assumptions which give good agreement. The other one, on the contrary, shows a non monotonic trend preventing the fitting of the data with the current correlations. The comparison between pressure gradients in straight pipes of equal diameter alternatively in absence of singularity and downstream of it evidences the influence of the upstream flow pattern.