在矿井地热预测中，矿井风流与围岩之间的非稳定传热系数是传热计算的重要参数。
In mine geothermal prediction, the instable heat transfer coefficient is an important parameter for heat transfer (between country rock and air flow) computation.
本文在实验模型的基础上，经简化建立了有三个污染源的置换通风三维稳定传热、流动的物理模型和数学模型。
Based on experimental models, the paper sets up three-dimensional steady heat transfer and flow physical model and mathematical model on a three polluting heat sources after simplification.
本文在轴对称不稳定热传导有限元分析模型的基础上，提出了一个内燃机燃烧室的活塞与缸套偶合系统的不稳定传热数值分析模型。
Based on an axisymmetric unsteady conduction model by FEM, a numerical analysis model of unsteady heat transfer for the piston-liner coupling system of combustion chamber in an I.
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