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Experimental and Computational Multiphase Flow 2023, 5(2): 221-231 https://doi.org/10.1007/s42757-022-0138-6
Research Article | Issue | Published: 08 August 2022

Effect of two-group void fraction covariance correlations on interfacial drag predictions for two-fluid model calculations in large diameter pipes

Show Author's Information Alexander Swearingen1,  Sean Drewry1,  Joshua P. Schlegel1( ),  Takashi Hibiki2
Department of Nuclear Engineering and Radiation Sciences, Missouri University of Science and Technology, 301 W 14th St, Rolla, MO 65401, USA
School of Nuclear Engineering, Purdue University, 516 Northwestern Ave, West Lafayette, IN 47907, USA
Keywords:
numerical solution, two-fluid model, interfacial area transport, large diameter pipe, void fraction covariance
Cite this article:
Swearingen A, Drewry S, Schlegel JP, et al. Effect of two-group void fraction covariance correlations on interfacial drag predictions for two-fluid model calculations in large diameter pipes. Experimental and Computational Multiphase Flow, 2023, 5(2): 221-231. https://doi.org/10.1007/s42757-022-0138-6
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Abstract Full text About this article

Void fraction covariance has been introduced into the interfacial drag calculation used to close the one-dimensional two-fluid model. A model for void fraction covariance has been developed for large diameter pipes. The newly developed model has been compared with two previously developed models in terms of void fraction prediction accuracy. The effects of these additions on the void fraction prediction uncertainty have been evaluated utilizing a computational tool developed in MATLAB. The results indicate that there are small differences in the void fraction prediction between the models evaluated and the two-fluid model without void fraction covariance. Higher void fractions above 0.7 show the most significant changes. However, the differences in the uncertainty are not significant when compared to the uncertainty in the data used for the comparison. The results highlight a need for additional data for higher void fractions, collected with steam–water systems in large diameter pipes.


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About this article

Effect of two-group void fraction covariance correlations on interfacial drag predictions for two-fluid model calculations in large diameter pipes

Show Author's information Alexander Swearingen1, Sean Drewry1, Joshua P. Schlegel1( ), Takashi Hibiki2
Department of Nuclear Engineering and Radiation Sciences, Missouri University of Science and Technology, 301 W 14th St, Rolla, MO 65401, USA
School of Nuclear Engineering, Purdue University, 516 Northwestern Ave, West Lafayette, IN 47907, USA

Abstract

Void fraction covariance has been introduced into the interfacial drag calculation used to close the one-dimensional two-fluid model. A model for void fraction covariance has been developed for large diameter pipes. The newly developed model has been compared with two previously developed models in terms of void fraction prediction accuracy. The effects of these additions on the void fraction prediction uncertainty have been evaluated utilizing a computational tool developed in MATLAB. The results indicate that there are small differences in the void fraction prediction between the models evaluated and the two-fluid model without void fraction covariance. Higher void fractions above 0.7 show the most significant changes. However, the differences in the uncertainty are not significant when compared to the uncertainty in the data used for the comparison. The results highlight a need for additional data for higher void fractions, collected with steam–water systems in large diameter pipes.

Keywords: numerical solution, two-fluid model, interfacial area transport, large diameter pipe, void fraction covariance

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Publication history
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Publication history

Received: 22 December 2021
Revised: 25 March 2022
Accepted: 24 May 2022
Published: 08 August 2022
Issue date: June 2023

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