A Variable Density Single-Fluid Model for Two-Phase Flow With Particular Reference to Steam-Water Flow
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A physical model is proposed for the bubble-flow regime of liquid- gas flow which is in good agreement with the important features of the process. In this model it is conceived that the mixture flows as a suspension of bubbles in the liquid, where radial gradients exist in the concentration of bubbles. The bubble concentration is assumed maximum at the center of the pipe, decreasing monotonically in a radial direction, and vanishing at the pipe wall. An important concept introduced is that the gas and liquid have the same velocity at any radial position. The flow parameter assumes different forms for flow in circular pipes and for flow between two flat plates. (M.C.G.)