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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Numerical Simulation of Liquid-Gas Two-Phase Flow with Large Density Difference in Multi-Layered Sintered Wick by the Lattice Boltzmann Method

Get access (open in a dialog) DOI: 10.1615/IHTC15.tpn.009543
pages 8681-8693

要約

The numerical simulations of fluid flow in porous media by means of the Lattice Boltzmann Method (LBM) have been reported from the 1990’s because the LBM is a promising numerical method for fluid dynamics and suitable for complex boundary structures such as porous media. Since the density difference between saturated vapour and liquid is quite large, we have to get over this difficulty when we use the LBM to simulate the twophase flow composed of saturated vapour and liquid, such as saturated water. In this study Inamuro model is used to simulate the two-phase flow in a sintered wick of a heat pipe. This model is the athermal Lattice Boltzmann models for immiscible two-phase fluids with large density difference. In our present approach, the treatment of boundary has been modified from the original model to deal with complex boundary structure. And the interpolation method for viscosity in the region of phase interface has also been modified. The two sizes solid spheres are arranged in the two layers, respectively, in order to simulate the new design of the sintered wick of heat pipes proposed by Hwang, et al. The behaviours of the bubbles in this wick under the gravitational field were simulated. We could have succeeded in stably getting the results of calculation for the two-phase flow with large density difference in the complex boundary. The modifications from the original model are explained, and the results of simulation for the two-phase flow with large density difference (the density ratio is 50, namely this ratio is nearly identical to the saturated vapour and liquid of water at approx. 240°C) in the multi-layered sintered wick are shown in 3D pictures.