局部非热平衡条件下多孔介质复合系统中的流动与传热研究

There are a wide variety of theoretical and engineering applications for flow and heat transfer in composite porous/fluid systems under local thermal non-equilibrium (LTNE) conditions. The stress jump and flux jump conditions at porous medium/clear fluid interface are adopted to investigate the flow and heat transfer in the channels partially filled with porous media more accurately under LTNE conditions. The phenomenon of heat flux bifurcation in composite system will be studied. The internal influences between two types of heat flux bifurcation which occur at the channel wall and inside the porous media will be investigated. The complicated heat transfer mechanisms represented by the phenomena of heat flux bifurcations, and the influence of heat flux bifurcation on the thermal performance of the system will be discussed. Experimental methods will be presented to measure the stress jump coefficient and the surface heat transfer coefficient at porous medium/clear fluid interface. Experiments will be carried out to measure the coefficients, and corresponding experimental correlations will be obtained, which will provide the basic data for the study of composite system. In addition, the momentum and heat transfer mechanisms at the porous medium/clear fluid interface will be studied, and the improved models for momentum and heat transfer at the interface will be developed. These studies will contribute to improve the theoretical and engineering works related to the flow and heat transfer in composite systems.

局部非热平衡条件下多孔介质复合系统中的流动和传热具有广泛的理论及工程应用背景。本项目将采用交界面应力跳跃模型和热流跳跃模型更为精细准确地研究局部非热平衡条件下部分填充多孔介质通道中的流动和传热；深入分析多孔介质复合系统中的热流分歧现象，研究通道壁面处与多孔介质内部产生的两种热流分歧现象间相互影响机理及其模式，阐明其表征的多孔介质复合系统中存在的复杂热量传递机制，揭示热流分歧现象对多孔介质复合系统宏观传热性能的影响；发展应力跳跃系数和交界面换热系数实验测量方法，对其进行实验测量，获得实验关联式，为多孔介质复合系统的研究提供最基本的科学数据；进一步揭示多孔介质复合系统中多孔介质区域与纯流体区域交界面处的动量与热量传输机理，完善交界面动量和热量传输模型。研究结果可以完善多孔介质复合系统中流动与传热研究，并为相关工程应用提供参考。

局部非热平衡条件下多孔介质复合系统中的流动和传热具有广泛的理论及工程应用背景。本项目采用交界面应力跳跃模型和热流跳跃模型研究了局部非热平衡条件下部分填充多孔介质通道中的流动和传热；深入分析了多孔介质复合系统中的热流分歧现象，阐明了其表征的多孔介质复合系统中存在的复杂热量传递机制，揭示了热流分歧现象对多孔介质复合系统宏观传热性能的影响；提出了应力跳跃系数和交界面换热系数的测量方法，研究了不同的流动方式以及不同的系统参数对他们的影响；研究了多孔介质复合系统中多孔介质区域与纯流体区域交界面处的动量与热量传输机理，提出了一种新的交界面过渡层模型，获得了几种实际多孔介质在交界面区域的过渡层厚度，对交界面动量和热量传输模型进行了完善。研究结果可以为相关理论研究及工程应用提供参考。