界面常质量流湍流传递

EXERGY TRANSFER OF TURBULENT FLOW THROUGH A DUCT WITH CONSTANT MASS FLUX

导出了常温下充分发展湍流（火用）传递方程组,依此研究了界面常质量流管内湍流（火用）传递,研究了由于粘性耗散、径向和轴向传质不可逆性引起的（火用）损率随流体性质、边界条件及空间位置的变化规律,分析了不同地点由于不同过程产生（火用）损失的机理。对单位长度的总（火用）损率计算表明,对给定的流体单位长度总（火用）损率是传质单元几何参数、边界条件和雷诺数的多元函数,通过（火用）损率最小化可设计和优化传质单元。

An exergy transfer equation set for fully developed turbulent flows under constant temper-ature is derived, with which exergy transfer of turbulent flow through a duct with constant mass flux is investigated. The distribution rules of exergy destruction rates due to viscosity, mass transfer in radial and in axis varying with fluid properties, boundary conditions and location are obtained. The mechanism of exergy destruction at different locations resulting from different processes is analyzed. The calculation shows that the total exergy destruction rate for a duct per unit length depends on geometrical parameters, Reynolds number and boundary conditions, and therefore the design and op-timization of a mass transfer system can be performed by minimizing the exergy destruction in the system.