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Multiphase Science and Technology

Published 4 issues per year

ISSN Print: 0276-1459

ISSN Online: 1943-6181

SJR: 0.144 SNIP: 0.256 CiteScore™:: 1.1 H-Index: 24

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MECHANISTIC SIMULATION OF SLUG FLOW IN VERTICAL PIPES USING THE ONE-DIMENSIONAL TWO-FLUID MODEL

Volume 27, Issue 2-4, 2015, pp. 229-245
DOI: 10.1615/MultScienTechn.v27.i2-4.90
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ABSTRACT

In this paper, an extension of the "slug capturing" technique to vertical slug flow is presented. In this method, the initiation and development of the slugs are obtained by solving the 1D transient two-fluid model equations. This approach has the advantage of being almost entirely mechanistic: the flow develops naturally as part of the transient calculation, thus minimizing the necessity of empirical correlations typically required to model the slug dynamics. The slug capturing technique had in the past been successfully applied in horizontal slug flow configurations, but the application to vertical flow is new. In the present work, the method was found to be able to capture the formation of slugs automatically in vertical pipes. Numerous simulations were performed for a large number of flow conditions and the results are compared with experimental data. It is shown that the computed flow and slug characteristics−such as the average liquid holdup in the pipe, and the velocity and frequency of the slugs−compare fairly well with the experimental data. A mesh sensitivity study is also presented to ensure that the predicted slug characteristics do not depend on the cell length for the practical sizes of the mesh used.

CITED BY
  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. Pucciarelli A., Galleni F., Moscardini M., Martelli D., Forgione N., STH/CFD coupled calculations of postulated transients from mixed to natural circulation conditions in the NACIE-UP facility, Nuclear Engineering and Design, 370, 2020. Crossref

  3. Leporini Mariella, Bonzanini Arianna, Ferrari Marco, Poesio Pietro, The extension of the one‐dimensional two‐fluid slug capturing method to simulate slug flow in vertical pipes , International Journal for Numerical Methods in Fluids, 93, 3, 2021. Crossref

  4. Andrea Pucciarelli, Francesco Galleni, Marigrazia Moscardini, Daniele Martelli, Nicola Forgione, STH/CFD Coupled Simulation of the Protected Loss of Flow Accident in the CIRCE-HERO Facility, Applied Sciences, 10, 20, 2020. Crossref

  5. Castello Branco Rodrigo L., Fontalvo Eric M.G., de Paula Igor Braga, Carneiro João N.E., Nieckele Angela O., Stability analysis of vertical annular flows with the 1D Two–Fluid Model: effect of closure relations on wave characteristics, International Journal of Multiphase Flow, 152, 2022. Crossref

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