As an efficiency heat and mass transfer method, thin liquid film has been widely used in industry. This paper studies on liquid nitrogen laminar film flows in the brazed cryogenic heat exchanger with 2.3mm distance between plates. Simplified theoretical models are established based on the characteristics of both the dynamic and heat and mass transfer of nitrogen film. Relationship between the dimensionless thickness and the coefficient of heat convection of liquid nitrogen film is derived. And the impact of rate of vapor content, intensity of interfacial convection heat transfer and Reynolds numbers are calculated and analyzed.

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