Sains Malaysiana 53(10)(2024): 3487-3497

http://doi.org/10.17576/jsm-2024-5310-21

Automatic Algorithm Applied for Calculating Thermal Conductivity by Transient Plane Source Method

 (Algoritma Automatik Digunakan untuk Menghitung Kekonduksian Terma melalui Kaedah Sumber Satah Fana)

ZHIJIE JIA^1,2, LIPING YANG^2,3, CHENGCHENG CAO², HUIDONG LI², CAIYUN LUO², YE TAO², QIU ZHONG², ZIJUN XU², ZEZHONG CHEN^1,*

¹School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China

²Inorganic Materials Analysis and Testing Center, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China

³State Key Laboratory of High-Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China

Diserahkan: 14 Mac 2024/Diterima: 13 Ogos 2024

Abstract

As a thermal conductivity measurement method, Transient Plane Source (TPS) method has gained much popularity because of its broad applicability, short measurement times, high precision and simple sample preparation. However, the accuracy of thermal conductivity calculations based on temperature rise data is often hindered by factors such as probe thickness, contact thermal resistance, and input power. Currently, there is no standardized criteria for selecting effective temperature rise data for thermal conductivity calculation. Consequently, the accuracy of results are limited by the operator's understanding of the TPS methods, and repeatability of the results is often poor. To address this issue, an automatic algorithm based on the international standard (ISO22007-2:2008) is proposed in this paper. By applying this algorithm to the measurement of different materials, it has been demonstrated that the proposed algorithm can produce more precise and consistent results than the conventional method. Additionally, the integration of the time window function , typically utilized solely for result validation in conventional methods, further enhances the objectivity and reproducibility of the results obtained by the automatic algorithm.

Keywords: Linear regression analysis; thermal conductivity; the effective measurement interval; transient plane source method

Abstrak

Sebagai kaedah pengukuran kekonduksian terma, kaedah Sumber Satah Fana (TPS) telah mendapat populariti kerana kebolehgunaannya yang luas, masa pengukuran yang singkat, ketepatan tinggi dan penyediaan sampel yang mudah. Walau bagaimanapun, ketepatan pengiraan kekonduksian terma berdasarkan data kenaikan suhu sering dihalang oleh faktor seperti ketebalan prob, rintangan terma sentuhan dan kuasa input. Pada masa ini, tiada kriteria piawai untuk memilih data kenaikan suhu yang berkesan untuk pengiraan kekonduksian terma. Akibatnya, ketepatan keputusan dihadkan oleh pemahaman pengendali tentang kaedah TPS, dan kebolehulangan keputusan selalunya lemah. Untuk menangani isu ini, algoritma automatik berdasarkan piawaian antarabangsa (ISO22007-2:2008) dicadangkan dalam kertas ini. Dengan menggunakan algoritma ini untuk pengukuran bahan yang berbeza, ia telah menunjukkan bahawa algoritma yang dicadangkan boleh menghasilkan keputusan yang lebih tepat dan tekal berbanding kaedah konvensional. Selain itu, penyepaduan fungsi tetingkap masa , biasanya digunakan semata-mata untuk pengesahan keputusan dalam kaedah konvensional, meningkatkan lagi objektiviti dan kebolehulangan hasil yang diperoleh oleh algoritma automatik.

Kata kunci: Analisis regresi linear; kaedah sumber satah fana; kekonduksian terma; selang pengukuran berkesan

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^*Pengarang untuk surat-menyurat; email: zzhchen@usst.edu.cn