Modeling of pressure drop in two-phase flow within expansion geometries

Kourakos, V. G.; Rambaud, P.; Chabane, S.; Buchlin, J. M.
March 2010
AIP Conference Proceedings;3/1/2010, Vol. 1207 Issue 1, p802
Conference Proceeding
An experimental study is performed in order to describe the single- and two-phase (air-water) horizontal flow in presence of a pipe expansion. Two types of singularities are investigated; sudden and progressive enlargement. In the lateral case, the opening angles of the divergence geometry are 5, 8 and 15 degrees. The surface area ratios tested are σ = 0.43 and σ = 0.65. Bubbly flow is the dominant flow regime that is investigated for volumetric quality up to 30%. The pressure recovery for the case of both single and two-phase was examined versus axial position. It is found that the smallest is the enlargement angle, the largest the recovery pressure for the same flow conditions: the pressure drop caused by the singularity is higher in the case of a sharper enlargement. The comparison of the experimental results to published models leads to proposed corrective coefficient for Jannsen’s (1966) correlation. Flow visualization is also performed; the flow patterns downstream the different singularities are identified in each configuration and plotted in Baker’s (1954) map for horizontal flow.


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