Influences of Conjugate Heat Transfer on Fluid Thermal Boundary Conditions in Laminar Pipe-Flows Under Non-uniform Heating
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摘要: 通过对管外壁非均匀加热/冷却条件下层流管内受迫流动热人口段内流体与管壁间耦合传热的分析计算,研究了试件几何尺寸、试件与流体物性参数及流体流动状态对管内流体内管壁处热边界条件均匀性的影响,并就如何选择试验管段材料和尺寸以提高实验精度给出了原则性建议.结果表明,管壁导热与管内流体间的耦合作用对内管壁处流体的热边界条件有着重要的影响.影响流体热边界条件均匀性的主要量纲一的量是Peclet数、管壁材料的相对导热系数、实验段相对加热长度和管壁相对厚度.Abstract: It is important in the experimental investigations of convection heat transfer to carry out the experiments under known fluid thermal boundary conditions. In this paper, in order to identify the influences of wall heat conduction on the fluid thermal boundary conditions, the conjugate heat transfer problem of wall-heat-conduction and forced convection in the thermal entrance region of fully-developed laminar pipe flows with non-uniform heating is studied numerically to find out the influences of pipe sizes, fluid and pipe material properties and flow states on the homogeneity of the fluid thermal boundaries at the fluid-wall interface. The results show that the conjugate heat transfer between the tube wall and fluid has a strong influence on the boundary condition of the in-tube fluid at the wall. Suggestions are given on the size and the wall material of the test section to improve the reliability and accuracy of experimental results.
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Keywords:
- fluid-solid coupling /
- heat conduction /
- convection /
- boundary conditions /
- homogeneity
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