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导出了湍流火用传递方程组 ,依此研究了壁面常热流对流换热管的火用传递 ,计算了由于粘性耗散、径向和轴向导热引起的火用损率分布。通过对单位体积总火用损率的计算表明 ,单位体积总火用损率是换热管几何参数和边界条件的多元函数 ,对于给定的几何参数 ,存在使单位体积总火用损率最小的边界条件 ,反之亦然。该结论对优化设计换热器及对给定边界条件的换热器优化选取具有一定的指导意义。
The equations of turbulent exergy transfer were deduced. Based on this, the exergy transfer of convection heat pipe with constant heat flux was studied. The distribution of exergy loss due to viscous dissipation, radial and axial heat conduction was calculated. The calculation of the total exergy loss per unit volume shows that the total exergy loss per unit volume is a multivariate function of geometric parameters and boundary conditions of the exothermic tube. For a given geometric parameter, there exists a problem of minimizing the total exergy loss per unit volume The boundary conditions, and vice versa. This conclusion is of guiding significance for the optimal design of heat exchangers and the optimal selection of heat exchangers for given boundary conditions.