界面積濃度輸送方程式の未発達気泡・スラグ流への適用性に関する検討(流体工学, 流体機械)

概要

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Developing air-water bubble flows in a vertical pipe were calculated using the combination of a multi-fluid model and an interfacial area concentration (IAC) transport equation. Calculations were conducted by using (a) a standard two-fluid model, (b) a two-fluid model and a one-group IAC equation, (c) a two-fluid model and a two-group IAC equation and (d) a three-fluid model and a two-group IAC equation. As a result of comparisons between measured and calculated void fractions, we confirmed that (1) the use of IAC equations brings about the reconstruction or reconsideration of interfacial drag models, (2) the two-group IAC equation requires initial values for a large bubble group even for the condition of no large bubbles, (3) the combination of the two-group IAC equation and two-fluid model cannot give good predictions for flows consisting of large and small bubbles, and (4) a multi-fluid model and a reconstructed drag force model are indispensable to obtain good predictions for bubbly to slug flow transition.
社団法人日本機械学会の論文
2002-05-25