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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Experimental investigations on temperature-dependent effective thermal conductivity of nanoporous silica aerogel composite
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Experimental investigations on temperature-dependent effective thermal conductivity of nanoporous silica aerogel composite

机译：纳米多孔硅气凝胶复合材料温度依赖性有效导热率的实验研究

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摘要

This paper presents an inverse method for retrieving temperature-dependent effective thermal conductivity of nanoporous silica aerogel composite at temperature ranging from 280 K to 1080 K and gas pressure between 0.01 Pa and 100 kPa from experimentally measured transient temperature data. This was achieved by combining a forward method solving combined conductive and radiative heat transfer accounting for temperature-dependent thermal conductivity, and an inverse method based on a real-valued genetic algorithm (GA) optimization. First, the sensitivity coefficients for the transient temperature profiles with respect to the variation of effective thermal conductivity were investigated. Then, several numerical experiments, in which the "experimental data" was numerically generated, were performed to illustrate the robustness and accuracy of the inverse method for retrieving the temperature dependent effective thermal conductivity from transient temperature history. The experimental data were used to retrieve the effective thermal conductivities of silica aerogel composite, the results fell within 0.014-0.044 W.m(-1)K(-1) for the temperature between 280 and 1080 K and gas pressure from 0.01 Pa to 100 kPa, and showed nonlinear increasing trend with increasing temperature, and with increasing gas pressure. (C) 2017 Elsevier Inc. All rights reserved.
机译：本文提出了一种逆方法，用于从实验测量的瞬态温度数据从280k至1080k和0.01Pa和100kPa之间的温度从280k到1080k和气体压力之间检索纳米多孔二氧化硅气凝胶复合物的温度依赖性有效导热率。这是通过组合求解组合的导电和辐射传热算法进行温度依赖性导热性的前进方法和基于实值遗​​传算法（GA）优化的反向方法来实现的。首先，研究了关于瞬态温度分布关于有效导热率变化的敏感性系数。然后，进行几个数值实验，其中执行了“实验数据”，以说明从瞬态温度历史中检索温度相关的有效导热率的逆方法的稳健性和准确性。实验数据用于检测二氧化硅气凝胶复合材料的有效热导率，结果下降在0.014-0.044wm（-1）k（-1）以内，温度为280至1080k，气体压力为0.01pa至100kPa ，并显示出温度升高，气体压力越来越多的非线性增加趋势。 （c）2017年Elsevier Inc.保留所有权利。

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