ライブラリ登録: Guest

ISSN Online: 2377-424X

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

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

Simulation of Multiphase Flow and Heat Transfer in Porous Media Using Lattice Boltzmann Method

Get access (open in a dialog) DOI: 10.1615/IHTC15.pmd.009217
pages 6913-6925

要約

A corrected heat flux of thermal lattice Boltzmann model is proposed in this paper, which ensures the heat flux continuity at the phase-phase interface naturally. And a new equivalent relaxation time is set at the phase-phase interface in the thermal lattice Boltzmann model, and through thermal energy transport model with series and parallel set respectively, the reliability of the new method on dealing with phase-phase interface is verified. The porous media is generated by the quartet structure generation set (QSGS). The effective thermal conductivity is obtained both with single phase and multiphase fluid in porous media. The non-wetting fluid in the large aperture is easy to merge, and the initial phase distribution will affect the final steady distribution. Varying the velocity of the displacing fluid into the porous media, the contents of twophase fluid are different and corresponding to different effective thermal conductivities. The effective thermal conductivity of porous media increases with increasing particle size. The connectivity of the particles along heat transfer direction provides a preferential path for heat transfer, which creates the higher effective thermal conductivity. When the wetting fluid with the lower thermal conductivity absorbed on the porous matrix, the predicted effective thermal conductivity is close to the Hashin-Shtrikman lower bound.