Simulation of Two-Phase Flow and Heat Transfer in a Channel and around a Tube by Lattice-Boltzmann Method

Document Type : Research Article

Authors

1 Ph.D. Student, Department of Mechanical Engineering, College of Engineering, Guilan University

2 Associate Professor, Department of Mechanical Engineering, College of Engineering, Guilan University

3 Associate Professor, Department of Mechanical Engineering, College of Engineering, Tehran University

Abstract

Determination of multiphase flow dynamics and thermal behavior of two-phase flow in a channel are of importance. The small-scale surface tension effect and related simulation efficiency, precision, and stability, have caused mesoscopic Lattice Boltzmann method broadening application. In the current study, the thermal-hydraulic behavior of subcooled falling flow in a vertical channel and around a single horizontal tube is simulated by using the Lee method and phase-filed model, and thermal passive scalar model. The modified curved boundary conditions and two different boundary conditions for side boundaries are investigated. The density ratio is 20 and other property’s ratios of water are applied, and the outside diameter of the tube is 28.9mm. The flow, temperature, and pressure fields are presented and a detailed understanding of the movement of the three-phase contact line, circulating flow and local and average Nusselt numbers are determined. The film thickness, thermal boundary layer variation by the film thickness, Reynold number effect on Nusselt number and mass conservation are investigated as verification. The results have shown good consistency and high effectiveness in the simulation of multiphase gas-liquid flows in the presence of a circular obstacle, and for viscosity and thermal diffusivity ratios of water.

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References

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Amirkabir Journal of Mechanical Engineering
Volume 53, Issue 1 (Special Issue)
April 2021
Pages 499-516

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