Transient numerical simulation and research of hydrogen condensation characteristics in a thermosyphon

27th International Cryogenics Engineering Conference and International Cryogenic Materials Conference 2018

Wang, J.Z.^1^2 ; Lv, C.^1 ; Pan, W.^1 ; Wu, J.H.^1 ; Li, Q.^1

Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, China^1

University of Chinese Academy of Sciences, Beijing, China^2

关键词: Condensation characteristics;    Design and optimization;    Large scale hydrogen;    Numerical investigations;    Temperature differences;    Transient numerical simulation;    Two dimensional numerical models;    Vapor-liquid interfaces;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/502/1/012006/pdf
DOI  :  10.1088/1757-899X/502/1/012006

来源: IOP

【 摘 要 】

A transient numerical investigation is performed to study the hydrogen condensation characteristics which are needed in the design and optimization of the heat-exchangers in large scale hydrogen liquefaction system. A two-dimensional numerical model of a thermosyphon has been implemented in ANSYS-FLUENT and the properties database of hydrogen are replaced with REFPROP. The volume of fluid (VOF) multiphase model is adopted to reconstruct the vapor-liquid interface, and the mass transfer and heat generation are modeled by introducing source terms to governing equations. In addition, the surface tension and contact angle are also taken into account. The simulation results, mainly the condensing heat transfer coefficient and temperature difference across the condensate film, are consistent with the public experiment data and new mass transfer time relaxation parameters for condensation are proposed. This study can provide some advice in the design of cryogenic fluid liquefaction system.