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NUMERICAL INVESTIGATION OF TWO-PHASE GAS-LIQUID FLOWS IN CIRCULAR AND NON-CIRCULAR HORIZONTAL TUBES

卷 12, 册 5, 2020, pp. 453-475
DOI: 10.1615/ComputThermalScien.2020026493
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摘要

The aim of this study is to investigate whether the Barnea flow-pattern map, which was originally developed for two-phase gas-liquid flows in circular tubes, can reliably predict gas-liquid flow patterns in non-circular tubes. To this end, air-water flows close to flow transition boundaries are selected and numerically simulated in one circular and two non-circular horizontal tubes of hydraulic diameter 0.051 m and length 2 m using ANSYS Fluent 18.0. The two non-circular tubes have rectangular cross sections with aspect ratios 1 (i.e., square) and 10, respectively. The following six flow transitions are investigated over a total of 40 simulations: smooth stratified to plug, plug to bubbly, slug to bubbly, annular to slug, stratified wavy to slug, and stratified wavy to annular flow. The results from the CFD simulations are validated against the flow patterns expected from the experimentally derived Barnea map for horizontal gas-liquid flows in circular tubes and good agreement is found overall, with some limited exceptions. In addition, good agreement is found between the flow patterns in circular and non-circular tubes with the same hydraulic diameter and otherwise similar flow conditions. Therefore, based on these findings, there is an indication that the Barnea map is capable of predicting flow patterns in circular, square, and rectangular tubes with reasonable reliability, although, given the large investigation space, further numerical and experimental confirmation is required before this statement can be generalized and confirmed. Furthermore, the influence of flow pattern transitions on important flow characteristics such as the void fraction and wall shear stress is investigated in the three tube geometries. The void fraction in the numerically simulated flows is validated against corresponding predictions from the experimentally derived Chisholm-Armand correlation and good agreement is observed. An increasing trend of wall shear stress with increasing superficial liquid velocity is also found.

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对本文的引用
  1. Ronshin Fedor, Dementyev Yuriy, Kochkin Dmitry, Eloyan Karapet, Vozhakov Ivan, Investigation of two-phase flow regimes in square minichannels with different mixers created using additive technologies, Experimental Thermal and Fluid Science, 132, 2022. Crossref

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