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Hydrodynamics and Heat Transfer of Liquid Nitrogen Laminar Falling Films in Cryogenic Heat Exchanger

[+] Author Affiliations
Ying-Bai Xie, Cheng Zhao, Jian-Cheng Tang, Ying-Cheng Mai

North China Electric Power University, Baoding, Hebei, China

Paper No. IMECE2009-11737, pp. 595-599; 5 pages
doi:10.1115/IMECE2009-11737
From:
  • ASME 2009 International Mechanical Engineering Congress and Exposition
  • Volume 9: Heat Transfer, Fluid Flows, and Thermal Systems, Parts A, B and C
  • Lake Buena Vista, Florida, USA, November 13–19, 2009
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4382-6 | eISBN: 978-0-7918-3863-1
  • Copyright © 2009 by ASME

abstract

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.

Copyright © 2009 by ASME

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