Yiyang Luo , Nan Gui , Zhiyong Liu , Xingtuan Yang , Jiyuan Tu
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引用次数: 0
摘要
本研究基于力与热传递之间的类比概念,提出了一种新颖的粒子间接触热阻模型。假定接触表面的热通量分布类似于应力分布,从而消除了接触边缘的温度奇异性问题。该模型与现有理论和实验进行了验证,结果显示两者吻合良好。结合使用该模型和热离散元件法,分析了高温试验装置内卵石床的温度和有效导热系数分布。在输入功率分别为 20 kW 和 82 kW 的情况下,热传导得到的平均有效热导率分别为 2.99 和 2.61 W/(m-K)。外壁温度从 200 °C 升至 1000 °C 会导致有效热扩散率增加约 20%。
A novel contact thermal resistance model for heat transfer in granular systems: Leveraging the force-heat analogy
A novel particle-to-particle contact thermal resistance model is proposed in this study, based on the concept of analogy between force and heat transfer. The distribution of heat flux on the contact surface is assumed to resemble the distribution of stress, eliminating the issue of temperature singularity at the contact edge. The model is validated against existing theories and experiments, showing good agreement. The combined use of the model and the thermal discrete element method is applied to analyze temperature and effective thermal conductivity distributions in a pebble bed within a high-temperature test unit. The average effective thermal conductivity obtained from thermal conduction is found to be 2.99 and 2.61 W/(m·K) for power inputs of 20 kW and 82 kW, respectively. An increase in the outer wall temperature from 200 °C to 1000 °C results in an approximate 20 % increase in the effective thermal diffusivity.
期刊介绍:
International Journal of Heat and Mass Transfer is the vehicle for the exchange of basic ideas in heat and mass transfer between research workers and engineers throughout the world. It focuses on both analytical and experimental research, with an emphasis on contributions which increase the basic understanding of transfer processes and their application to engineering problems.
Topics include:
-New methods of measuring and/or correlating transport-property data
-Energy engineering
-Environmental applications of heat and/or mass transfer