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The effect of fouling on thermodynamic performance of forced convective heat transfer through a duct

机译：结垢对通过管道强制对流换热的热力学性能的影响

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摘要

Based on the first and second thermodynamic laws, a new systematic approach to study in detail the effect of fouling on the thermodynamic performance of forced convective heat transfer through a duct with constant wall temperature and constant wall heat flux for thermally and hydrodynamically fully developed turbulent flow is investigated. When considering fouling exists inside the duct, the local and mean exergy variation coefficient, exergy variation flux, dimensionless exergy variation number and the equation of exergy variation rate of working fluids, etc. have been put forward and their generalized expressions derived. A criterion evaluating the effect of fouling on the exergy variation of working fluids of the forced convective heat transfer process, which is defined as the exergy variation degradation rate, has been put forward. By reference to a duct, the numerical results of the exergy variation of working fluids are obtained (considering fouling or not), the effects of Reynolds number, the thickness of the fouling layer, dimensionless inlet temperature difference and wall heat flux on the exergy variation of working fluids are discussed. The results show that the exergy variation degradation rate increases with the increase of Reynolds number and decreases with the increase of dimensionless inlet temperature and wall heat flux. The exergy variation caused by the heat conduction of fouling plays an important role in the total exergy variation of working fluids.
机译：根据第一和第二热力学定律，采用一种新的系统方法来详细研究结垢对通过恒定壁温和恒定壁热通量的管道进行强制对流换热的热力学性能的影响，以充分利用热力和水动力充分发展的湍流被调查。当考虑管道内部存在结垢时，提出了局部和平均火用变化系数，火用变化通量，无因次火用变化数和工作流体的火用变化率方程等，并推导了它们的一般表达式。提出了评价结垢对强制对流换热过程中工作流体的（火用）变化影响的标准，即“火用变化退化率”。参照管道，获得了工作流体的火用变化的数值结果（考虑是否结垢），雷诺数，污垢层的厚度，无因次入口温度差和壁热通量对火用变化的影响。的工作流体的讨论。结果表明，随着雷诺数的增加，火用能级变化的降解率增加，而随着无因次入口温度和壁热通量的增加，火用变化降解率降低。由结垢的热传导引起的火用变化在工作流体的总火用变化中起重要作用。

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