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ISSN Online: 2377-424X

ISBN Print: 0-89116-909-1

International Heat Transfer Conference 9
August, 19-24, 1990 , Jerusalem, Israel

EFFECT OF MASS VELOCITY ON THE HYDRODYNAMIC BEHAVIOR IN VERTICALLY DOWNWARD FLOW OF STEAM-WATER MIXTURE

Get access (open in a dialog) DOI: 10.1615/IHTC9.4400
pages 89-94

要約

The mass velocity effect on void fraction and two-phase pressure drop has been experimentally investigated in the vertically downward flow of steam-water mixture at elevated pressures. The test section consisted of a 19.58 mm ID and 6000 mm long smooth tube. The test conditions were pressures of 5.9, 8.8 and 11.7 MPa, mass fluxes from 100 to 1000 kg/m2s and steam qualities from -59% to 86%. Measurements were conducted under heated and unheated conditions. In low velocity regions, void fraction remarkably varied with mass velocity. It was also observed at high steam qualities that the vapor phase velocity became higher than the liquid phase velocity even in downward flow.
The frictional pressure drop derived from the measured total pressure drop by use of the new void correlation required the correction of existing two-phase friction multipliers in accordance with the mass velocities in the low velocity region. A new multiplier correlation is derived considering the mass velocity effect.