在降膜换热器中研究了R12和R114非共沸混合物的蒸发传热系数。该项目的主要目的是研究当使用混合物代替纯制冷剂时，额外的传质阻力如何影响传热系数。试验装置由一根管子组成，管子从外部加热，制冷剂在内部形成降膜。加热是通过液体在环形空间中逆流流动来实现的。从结果可以得出结论，在表面蒸发条件下，混合物的传热系数在给定Re数下纯制冷剂的相应系数之间。这表明在这种条件下，在降膜中使用混合物时的附加传质阻力很小。 这可能是由于薄膜厚度小。还测量了传热系数与热通量的关系。同样，在给定热流密度下，混合物的数值介于两种纯制冷剂的相应数值之间，无论是在表面蒸发还是核沸腾条件下。引文:研讨会，ASHRAE交易，1985年，第91卷，pt。你好，檀香山2B

The evaporative heat transfer coefficient for nonazeotropic mixtures of R12 and R114 has been studied in a falling film heat exchanger. The main aim with the project was to study how the heat transfer coefficient is influenced by the additional mass transfer resistance that is introduced when a mixture is used instead of a pure refrigerant.The test apparatus consisted of one tube, which was heated from the outside, with the refrigerant forming a falling film on the inside. The heating was done by a liquid flowing in an annular space countercurrently to the falling film.From the results it can be concluded that the heat transfer coefficients for the mixtures at surface evaporation conditions are between the corresponding ones for the pure refrigerants at given Re numbers. This indicates that the additional mass transfer resistance when a mixture is used is small in a falling film at such conditions. This is probably due to the small film thickness.The heat transfer coefficients versus the heat flux were also measured. Again, the values for the mixtures at a given heat flux fall between the corresponding ones for the two pure refrigerants, both at surface evaporation and nucleate boiling conditions.