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本文把多组分工质的凝结换热过程分为质扩散和膜状凝结两部分,从热量、质量守恒原理出发,结合相图,首次推导出计算多组分工质凝结换热过程中由于质扩散而引入的附加传热漏差的计算公式。认为在考虑了附加传热温差后,如果将单一工质的物性量代以多组分工质的相应量,即可应用关于单一工质的凝结换热公式进行多组分工质的凝结换热计算。在理想溶液的基础上,详细地分析了双组分混合工质在管内凝结换热条件下附加传热温差的影响因素,指出提高雷诺数Re是减小扩散阻力的主要途径。
In this paper, the condensation heat transfer process of multicomponent working fluid is divided into two parts: mass diffusion and membrane condensation. Based on the principle of conservation of mass and heat, combined with the phase diagram, The introduction of additional heat transfer leakage difference formula. It is considered that after considering the additional heat transfer temperature difference, if the physical property quantity of a single working fluid is replaced by the corresponding quantity of multi-component working fluid, the condensing heat transfer calculation of multi-component working fluid can be applied on the condensation heat transfer formula of single working fluid . On the basis of the ideal solution, the influencing factors of the additional heat transfer temperature difference of the two-component mixed working medium under the condition of tube condensation heat transfer are analyzed in detail. It is pointed out that increasing the Reynolds number Re is the main way to reduce the diffusion resistance.