Open AccessSimulation of effect of bottom heat source on natural convective heat transfer characteristics in a porous cavity by lattice Boltzmann method
Author(s) -
He Zong-Xu,
Yan Wu,
Kai Zhang,
Yang Xiang-Long,
Wei Yi-Kun
Publication year - 2017
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.66.204402
Subject(s) - heat transfer , lattice boltzmann methods , materials science , mechanics , natural convection , convective heat transfer , porous medium , thermodynamics , convection , heat transfer coefficient , porosity , physics , composite material
The influence of bottom heat source on natural convective heat transfer characteristics in a two-dimensional square cavity fully filled with a homogeneous porous medium is numerically studied by the lattice Boltzmann method. In this physical model, the upper wall of porous cavity is set to be a cold heat source, and the bottom wall is designed as a local hot heat source. Both the left wall and the right wall are set to be adibatic. Specifically, the effects of both the position and size of bottom heat source on the properties of natural convective heat transfer are analyzed. The numerical results show that the position and size of bottom heat source have great influences on the characteristics of natural convective heat transfer, and there also exist the best position (a=4/16) and optimal size (b=0.75) of the bottom heat source for the maximal convective heat transfer intensity (Numax 10.35) and heat exchange capacity (Qmax 5.69).