Abstract
In order to clarify the flow characteristics of two-phase flows in pipes under microgravity, general correlations on the volumetric fraction and the frictional pressure loss in the pipe were obtained from the theoretical analysis based on an annular flow model. They were compared with the experimental results which were obtained in an immiscible equal-density silicone oil-water two phase flow in a horizontal tube of 25 mm in I.D. and also in a saturated R114 two-phase flow under microgravity in an aircraft. As a result, the calculated results of the frictional pressure loss were found to agree well with the experimental results by taking the values of 10 to 100 as the constant B for interfacial friction in the silicone oil-water liquid-liquid two-phase flow and values B close to 10 in the saturated R114 two-phase flow.
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