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采用分析方法,求解了壁面热流呈指数变化的圆管内层流热入口段的换热.结果表明,换热系数与壁温沿轴向的温度梯度直接相关,轴向壁温梯度越大,换热就越强.进而,分析讨论了壁面热流不同变化情况下,充分发展段的场协同度.通过分析场协同度和对流换热系数的对应关系,验证了场协同原理的正确性,也表明优化热边界条件是提高场协同度、从而实现强化换热的途径之一.
The analytical results show that the heat transfer coefficient is directly related to the temperature gradient of the wall temperature along the axial direction, and the larger the axial wall temperature gradient, the more the heat transfer coefficient The heat is stronger.Furthermore, the field coordination degree of the fully developed section under different changes of the wall heat flow is analyzed and discussed.The correctness of the field coordination principle is verified by analyzing the correspondence between the field coordination degree and the convection heat transfer coefficient Optimizing the thermal boundary conditions is to improve the field coordination, so as to achieve one of the ways to strengthen the heat exchange.