Abstract

In order to obtain the data on wall and interfacial friction forces for two-phase flows in a triangle tight lattice subchannel, adiabatic experiments were conducted for single- and two-phase flows under hydrodynamic equilibrium flow conditions. In the experiment, air was used as the test gas, while water and water with a surfactant as test liquids to know the effects of the reduced surface tension on the wall and the interfacial friction forces. The data showed that both the wall and the interfacial friction forces were higher in air-water with a surfactant system than air-water one. In the analysis, the respective data have been compared with the predicted values by existing correlations, and the existing correlations were modified to improve its prediction accuracy against the present data. The modified correlations can predict well the present data on the wall and the interfacial friction forces for both air-water and air-water with a surfactant systems.

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