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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

Two-phase flow pressure drop in circular channel with abrupt contraction and expansion




Abstract

Gas-liquid flow pressure drops occurred in circular channels with sudden contraction and expansion have been studied and investigated experimentally. The liquid phase consists of deionized water, while nitrogen gas is used for the gas phase. The area ratio for the flow channel in contraction and expansion is 0.14. Measurements are done for water flow rates up to approximately 30 g/s, while the flow rate of the nitrogen gas is varied from 0.00049 to 0.029 g/s. When comparing the experimental data with theoretical and semi-empirical equations, the conditions of incompressible flow, flat velocity profile, vena contracta, slip ratio, homogeneous two-phase flow, and void fraction effect are considered. The measured results showed that the two-phase flow pressure drop data agrees adequately with the correlations available in the literature. In addition, the two-phase flow pressure drops are observed to be very sensitive to the void fraction. In order to accurately predict the pressure drops for two-phase flow in abrupt contraction and expansion with correlations, the void fractions have to be properly determined.

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