Effects of Contact Resistance on Heat Transfer Behaviors of Fibrous Insulation

• Published in: Chinese journal of aeronautics Vol. 22; no. 5; pp. 569 - 574
• Main Authors: Shuyuan, Zhao, Boming, Zhang, Shanyi, Du
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.10.2009
• Subjects: Approximation; Contact resistance; Deviation; effective thermal conductivity; Flux; Heat transfer; Insulation; Mathematical analysis; Mathematical models; Monte Carlo methods; radiative properties; 传热行为; 平均绝对偏差; 接触电阻; 瞬态测量; 蒙特卡罗方法; 辐射特性; Monte Carlo methods; radiative properties; effective thermal conductivity; contact resistance; heat transfer
• ISSN: 1000-9361
• DOI: 10.1016/s1000-9361(08)60143-0

In this article, a numerical model combining conduction and radiation is developed based on two flux approximation to predict the heat transfer behavior of fibrous insulation used in thermal protection systems. Monte Carlo method is utilized to determine the modified radiative properties with experimentally measured transient external temperature as high as 1 000 K. It is found that the estimated radiative properties become time-independent after about t = 3 000 s. By comparing the predicted to the measured results in transient state, the contact resistance exerts significant influences upon the temperature distribution in the specimen. Results show that the averaged absolute deviation is 3.25% when contact resistance is neglected in heat transfer model, while 1.82% with no contact resistance.