Experimental data were collected for the void fraction, pressure drops and flow regimes aboard the NASA KC-135 zero gravity aircraft. The slip ratio was obtained from in-situ void-fraction measurements and the liquid and gas superficial velocities. The gas-phase distribution parameter "C{sub}0", which is obtained from the drift flux model, has also been estimated for dl flow regimes at 1-g and μ-g conditions. Results have shown that in bubbly flow the slip ratio is unity at μ-g, and less than unity at 1-g. For slug flow at microgravity, the slip ratio was between 1 and 1.5, and approximately 20 for annular flow. In transitional flow, it varied from 1.5 to 20.
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