Inverse method for retrieving high-temperature effective thermal conductivity of nanocomposite thermal insulation

doi:10.7523/j.issn.2095-6134.2018.02.010

Abstract

Abstract: An experimental apparatus was built to measure transient thermal characteristics of nanocomposite thermal insulation within a temperature range between 290 and 1 090 K. An inverse method was developed to retrieve the temperature-dependent effective thermal conductivity based on transient temperature measurements. It was achieved by combining a forward model for solving combined conduction and radiation and an optimization method based on genetic algorithm (GA). The method was validated by numerical experiments. The temperature-dependent effective thermal conductivities of nanocomposite thermal insulation at normal pressure were retrieved by solving the inverse method. The retrieved value increased from 0.027 to 0.043 W/(m·K) as temperature increased from 290 to 1 090 K.

Key words: nanocomposite thermal insulation, effective thermal conductivity, inverse identification, high temperature experiment

CLC Number:

TK124

LIU Hua, XIE Xiangqian, JIN Zicheng, XIA Xinlin, AI Qing, LI Donghui. Inverse method for retrieving high-temperature effective thermal conductivity of nanocomposite thermal insulation[J]. , 2018, 35(2): 216-221.

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