Validation of a parietal heat transfer model in a constant volume spherical vessel

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Thermal Sciences Pub Date : 2025-07-01 DOI:10.1016/j.ijthermalsci.2025.110082

Taïssir Kasraoui , Karl Joulain , Rémi Bertossi

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Abstract

This work aims to numerically estimate the parietal heat flux in various thermal systems, such as the spherical combustion chamber at constant volume. We estimate mainly the convective heat coefficient using a new approach based on the kinetic theory of gas instead of existing macroscopic models. In this configuration, which is marked by high pressures and temperatures, assessing the wall heat flux presents an important challenge. This study employs a transient heat transfer model derived from an innovative application of kinetic theory of gases to elucidate conduction phenomena between gas particles and a cold wall at short scales. We want to analyze and evaluate heat exchange at the wall by modeling the interactions between the flame and the wall, as well as the burned gas and the wall, using an unsteady thermal transfer model implemented in FORTRAN code. Numerical results of time evolution of pressure and heat flux in different operating conditions were illustrated and compared to the experimental ones to validate the approach.

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定容球形容器壁面传热模型的验证

本工作旨在数值估计各种热系统，如定容球形燃烧室的壁热流密度。我们主要用一种基于气体动力学理论的新方法来代替现有的宏观模型来估计对流热系数。在这种以高压和高温为特征的结构中，评估壁面热流是一个重要的挑战。本研究采用一种创新的气体动力学理论推导出的瞬态传热模型来解释短尺度下气体粒子与冷壁之间的传导现象。我们希望通过模拟火焰与壁面之间的相互作用，以及燃烧的气体与壁面之间的相互作用，使用FORTRAN代码实现的非定常传热模型来分析和评估壁面的热交换。给出了不同工况下压力和热流密度随时间变化的数值计算结果，并与实验结果进行了对比，验证了该方法的有效性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Thermal Sciences 工程技术-工程：机械

CiteScore

8.10

自引率

11.10%

发文量

531

审稿时长

55 days

期刊介绍： The International Journal of Thermal Sciences is a journal devoted to the publication of fundamental studies on the physics of transfer processes in general, with an emphasis on thermal aspects and also applied research on various processes, energy systems and the environment. Articles are published in English and French, and are subject to peer review. The fundamental subjects considered within the scope of the journal are: * Heat and relevant mass transfer at all scales (nano, micro and macro) and in all types of material (heterogeneous, composites, biological,...) and fluid flow * Forced, natural or mixed convection in reactive or non-reactive media * Single or multi–phase fluid flow with or without phase change * Near–and far–field radiative heat transfer * Combined modes of heat transfer in complex systems (for example, plasmas, biological, geological,...) * Multiscale modelling The applied research topics include: * Heat exchangers, heat pipes, cooling processes * Transport phenomena taking place in industrial processes (chemical, food and agricultural, metallurgical, space and aeronautical, automobile industries) * Nano–and micro–technology for energy, space, biosystems and devices * Heat transport analysis in advanced systems * Impact of energy–related processes on environment, and emerging energy systems The study of thermophysical properties of materials and fluids, thermal measurement techniques, inverse methods, and the developments of experimental methods are within the scope of the International Journal of Thermal Sciences which also covers the modelling, and numerical methods applied to thermal transfer.