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首页> 外文期刊>International Journal of Heat and Mass Transfer >On the use of effective thermophysical properties to predict the melting process of composite phase change materials with coarse structures
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On the use of effective thermophysical properties to predict the melting process of composite phase change materials with coarse structures

机译：关于使用有效热物理性能预测复合相变材料的粗结构熔化过程

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Composite PCMs combining metallic foam and paraffin are widely used as phase change materials (PCMs) to tailor the properties of pure PCMs and enhance the thermal energy storage/release. For the complex composites structures, the transient thermal response prediction by direct simulation (DS) is not easy in term of geometry generation and computation. The volume-averaged model (1T model) considering the composite PCMs as homogeneous media is sometimes used to deal with thermal transport in Composite PCMs, not always with a sufficiently good local description of non-steady conditions. The paper carries out a set of cases where a composite PCM modelled as an open-pore body-centred cell made of Aluminium (Al) filled with paraffin (ⅰ) to investigate the combined effects of the geometry of the unit cell (side length, porosity), the composite sample (sample height) and boundary conditions (heat input) on the heat response; (ⅱ) to identify the local/overall errors in temperature and volume fraction of liquid PCM (and thus of stored heat) induced by the use of 1T model for various geometry/heat flux combinations. Analytical equations are proposed to predict the maximum temperature difference between Al and PCM as well as the maximum temperature difference calculated by applying the 1T or DS model as a function of the open cell structure geometry and heat flux. The main novelty introduced in the paper is the analytical model used to quantify the maximum local error on molten PCM volume fraction for the 1T model, and thus on heat stored/released. The model supplies good local thermal response predictions for fine structures and lower heat flux input. Nevertheless, errors in the volume fraction of molten PCMs predicted for the whole sample are far lower and the 1T model can be easily applied in a wider range of geometry/conditions.
机译：组合金属泡沫和石蜡的复合PCM广泛用作相变材料（PCM），以定制纯PCM的性质，并增强热能存储/释放。对于复合复合材料结构，直接模拟（DS）的瞬态热响应预测在几何生成和计算期间不容易。考虑复合PCM作为均匀介质的体积平均模型（1T模型）有时用于处理复合PCM中的热传输，并不总是具有足够良好的非稳定条件的局部描述。本文采用一组案例，其中复合PCM以填充用石蜡填充的铝（Al）制成的开放式孔体为中心电池，以研究单位电池（侧长度）的几何形状的综合影响孔隙率），复合样品（样品高）和热响应上的边界条件（热输入）; （Ⅱ）以鉴定使用1T模型用于各种几何/热通量组合的液体PCM温度和体积分数的局部/总体误差。提出了分析方程来预测Al和PCM之间的最大温差以及通过将1T或DS模型应用于开放电池结构几何和热通量的函数来计算的最大温度差。本文中介绍的主要新奇是用于量化1T型号熔融PCM体积分数上的最大局部误差的分析模型，从而进行热量储存/释放。该模型为细结构和较低的热通量输入提供良好的局部热响应预测。然而，对整个样本预测的熔融PCMS的体积分数的误差远低得多，1T模型可以容易地应用于更广泛的几何/条件。

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