Numerical and Experimental Investigation on Photothermal Performance of Polyimide/High-Electrical-Performance-Coating Composite Films Considering Surface Roughness

  • JING Peng ,
  • ZHOU Xiao ,
  • XU Zhengyang ,
  • XU Zhiguo
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  • 1. School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
    2. Sunman (Zhenjiang) Co., Ltd, Zhenjiang 212000, China

Online published: 2023-12-01

Supported by

This work is supported by the National Natural Science Foundation of China (Grant No. 51576126).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022

Abstract

Polyimide (PI) films are the common and important components on spacecraft for thermal control. Their parameter design accuracy has an important impact on the spacecraft thermal balance but there are few studies focusing on the effect of film surface defects. In the present study, photothermal properties of composite films made of PI films and germanium/indium tin oxide/aluminum coatings are obtained by UV-VIS-NIR spectrophotometer. The film surface morphology of composite films is obtained by the atomic force microscope. The present study creatively introduces surface roughness into modeling from the perspective of finite-difference time-domain (FDTD) model. The FDTD method considering surface roughness is used to present a comprehensive investigation on the coating effect on the photothermal properties including transmittance and reflectance of composite films. Based on the random rough surface generated by root-mean-square (RMS) roughness and correlation length, the FDTD method is applied to characterize the electromagnetic field of composite films. It has been found that the numerical accuracy is greatly improved and the numerical results agree well with the experimental data when surface roughness is considered. The results also show that coating material and thickness have remarkable impacts on photothermal properties of the composite films.

Cite this article

JING Peng , ZHOU Xiao , XU Zhengyang , XU Zhiguo . Numerical and Experimental Investigation on Photothermal Performance of Polyimide/High-Electrical-Performance-Coating Composite Films Considering Surface Roughness[J]. Journal of Thermal Science, 2022 , 31(4) : 1206 -1219 . DOI: 10.1007/s11630-022-1453-7

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