通过数值研究扩展用于确定低导热材料比热容的瞬态平面源扫描方法

IF 3.1 2区 化学 Q2 CHEMISTRY, ANALYTICAL Thermochimica Acta Pub Date : 2024-10-28 DOI:10.1016/j.tca.2024.179883
Zijin Zeng , Christian Müller , Besira Mihiretie
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引用次数: 0

摘要

与传统的瞬态平面源 (TPS) 方法不同,瞬态平面源扫描 (TPSS) 技术可直接测定比热容,但需要使用专门设计的样品支架才能进行精确测量。虽然这种方法能正确测定中等和高导热系数样品的比热容,但往往会低估低导热系数样品的比热容值。本文证明,比热容被低估的原因是测量过程中的热量损失。为了精确量化热损失,我们根据测量数据调整了关键材料属性,并基于有限元法建立了一个数值模型。该模型可密切描述测量的热响应曲线,从而精确测定比热容。因此,本研究引入了一种新方法,结合数值模拟来增强导电性差样品的 TPSS 测量,为确定比热容提供了一种可靠的替代方法。
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Extending the Transient Plane Source Scanning method for determining the specific heat capacity of low thermal conductivity materials through a numerical study
In contrast to the conventional Transient Plane Source (TPS) method, the Transient Plane Source Scanning (TPSS) technique allows for the direct determination of the specific heat capacity and requires the use of a specially designed sample holder for accurate measurements. While this method correctly determines the specific heat capacity of samples with moderate and high thermal conductivity, it tends to underestimate the values for those with low thermal conductivity. This paper demonstrates that the underestimated specific heat capacity results from heat loss during the measurement process. To precisely quantify the heat loss, a numerical model based on the finite element method was developed, with key material properties tuned based on measurement data. This model can closely describe the curve of measured thermal response, thereby enabling the precise determination of the specific heat capacity. Consequently, this study introduces a novel approach that incorporates numerical simulation to enhance TPSS measurements of poorly conducting samples, providing a reliable alternative for determining the specific heat capacity.
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来源期刊
Thermochimica Acta
Thermochimica Acta 化学-分析化学
CiteScore
6.50
自引率
8.60%
发文量
210
审稿时长
40 days
期刊介绍: Thermochimica Acta publishes original research contributions covering all aspects of thermoanalytical and calorimetric methods and their application to experimental chemistry, physics, biology and engineering. The journal aims to span the whole range from fundamental research to practical application. The journal focuses on the research that advances physical and analytical science of thermal phenomena. Therefore, the manuscripts are expected to provide important insights into the thermal phenomena studied or to propose significant improvements of analytical or computational techniques employed in thermal studies. Manuscripts that report the results of routine thermal measurements are not suitable for publication in Thermochimica Acta. The journal particularly welcomes papers from newly emerging areas as well as from the traditional strength areas: - New and improved instrumentation and methods - Thermal properties and behavior of materials - Kinetics of thermally stimulated processes
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