Numerical investigation of the influence of mushy zone parameter Amush on heat transfer characteristics in vertically and horizontally oriented thermal energy storage systems
Numerical investigation of the influence of mushy zone parameter Amush on heat transfer characteristics in vertically and horizontally oriented thermal energy storage systems
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DOI：
10.1016/j.applthermaleng.2019.01.102
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发表时间：
2019-03-25
影响因子：
6.4
通讯作者：
Eames, Philip C.
中科院分区：
文献类型：
--
作者：
Fadl, Mohamed;Eames, Philip C.
研究了糊状区参数A（mush）对相变材料月桂酸（PCM）在垂直和水平封闭空间中的传热和熔化特性的影响。关于该参数的哪个值应用于相变传热的准确模拟缺乏明确性，解决这一问题将有助于LHTES（潜热热能储存）系统的准确模拟和设计。进行的数值分析使用商业CFD代码ANSYS FLUENT 18.2和孔隙度公式。所用的糊状区参数范围为10（5）~ 10（7）。将预测的熔体前沿位置与文献中已发表的实验数据进行了比较。模拟提供了关于能量储存量和熔体分数的定量信息，并提供了对传热过程的更好理解。使用不同的A（mush）值的预测之间的比较，和实验数据表明，正确选择的A（mus）h的值中使用的动量方程是一个重要的参数LHTES的精确建模，并具有显着的影响固-液界面的形状和进展。研究表明，随着A（mush）值的增大，流体速度减小，对流换热速率降低，因此，合理选择糊状区参数对准确模拟LHTES系统，更好地理解相变行为和传热特性是必要的。
The effect of the value used for the mushy zone parameter (A(mush)) on predicted heat transfer and melting characteristics of a phase change material (PCM) Lauric acid, in both vertical and horizontal enclosures was studied. There is a lack of clarity regarding which value of this parameter should be used for accurate simulations of phase change heat transfer, addressing this will aid in accurate simulation and design of systems for LHTES (Latent heat thermal energy storage). The numerical analysis undertaken used a commercial CFD code ANSYS FLUENT 18.2 and the enthalpy-porosity formulation. The range of mushy zone parameter used was from 10(5) to 10(7).The predicted locations of the melt front were compared to published experimental data available in the literature. The simulations provided quantitative information about the amount of energy stored and the melt fraction and providing improved understanding of the heat transfer process. Comparison between predictions using different values of A(mush), and experimental data showed that correct selection of the value of A(mus)h to be used in the momentum equations is an important parameter for accurate modelling of LHTES and has a significant influence on the solid-liquid interface shape and progression. The study reveals that increasing the value of A(mush) leads to a decrease in fluid velocity, decreasing convection and the rate of heat transfer, therefore, proper selection of the mushy zone parameter is necessary to accurately simulate LHTES systems and provide a better understanding of the phase change behaviour and heat transfer characteristics.