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A MODEL FOR PREDICTING THE TRANSITION BETWEEN STRATIFIED AND ANNULAR FLOW IN HORIZONTAL PIPES

卷 25, 册 1, 2013, pp. 79-100
DOI: 10.1615/MultScienTechn.v25.i1.40
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摘要

In this paper a mechanistic one-dimensional approach to the prediction of the transition from stratified to annular two-phase flow in horizontal pipes is presented. Such transition is deemed to occur when the liquid film wets the whole of the pipe circumference. This is determined from a consideration of the effects of the interface curvature, which is modeled here by a double circle geometric configuration incorporating a correlation for the calculation of the wetted angle. The model is cast in the framework of the two-fluid model and incorporated in a numerical procedure. The model also accounts for local droplet entrainment and deposition between the film and the gas core. With the model, it is possible to predict the growth and spread of the liquid film around the circumference along the pipe in a dynamic manner; transition to annular flow eventually occurs in a seamless manner when the film wets the whole of the circumference. The results are evaluated by comparing the numerical prediction of the transition from stratified to annular flow with an experimentally determined flow pattern map found in the literature. The comparison shows satisfactory agreement with experimental data.

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对本文的引用
  1. Fontalvo Eric M.G., Branco Rodrigo L. Castello, Carneiro João N.E., Nieckele Angela O., Assessment of closure relations on the numerical predictions of vertical annular flows with the two-fluid model, International Journal of Multiphase Flow, 126, 2020. Crossref

  2. Naghibi Falahati, Shokri Vahid, Majidian Alireza, Comparison of well-posedness criteria of two-fluid models for numerical simulation of gas-liquid two-phase flows in vertical pipes, Thermal Science, 26, 2 Part B, 2022. Crossref

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