Melting with convection and radiation in a participating phase change material
Melting with convection and radiation in a participating phase change material
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DOI：
10.1016/j.apenergy.2012.11.031
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发表时间：
2013-09
期刊：
影响因子：
11.2
通讯作者：
J. Fuentes;K. Johannes;F. Kuznik;Matthieu Cosnier;J. Virgone
中科院分区：
文献类型：
--
作者：
J. Fuentes;K. Johannes;F. Kuznik;Matthieu Cosnier;J. Virgone
本文提出了一种新的模型来模拟相变材料在自然对流和辐射作用下的熔化过程。对于相变问题，采用焓公式。能量方程用有限差分法求解，流体流动方程用晶格玻尔兹曼法求解。对于辐射强度，采用离散坐标法求解辐射传递方程，然后在能量方程中加入辐射通量。首先用文献结果对模型进行了验证。然后，模拟了填充脂肪酸的玻璃砖壁的传热过程。结果表明：(1)自然对流在整体换热过程的过渡行为中起重要作用；(2)长波辐射对熔化过程的影响较小。
This article presents a novel model to simulate melting of a phase change material, with natural convection and radiation. For the phase change problem, the enthalpy formulation is used. Energy equation is solved by finite differences, whereas fluid flow equations are solved by the lattice Boltzmann method. For radiation intensity, the radiative transfer equation is solved by the discrete ordinates method, and then radiation flux is added into the energy equation. The model is first validated with literature results. Then, a glass brick wall filled with a fatty acid is simulated to evaluate the heat transfer processes. The results show that (1) natural convection plays an important role in the transitional behaviour of the global heat transfer process and (2) the long wave radiation has few impacts on the melting process.