Heat and Mass Transfer Mechanisms of Helium Film Condensation on Vertical Surfaces
As an important cryogenic fluid with the lowest boiling point(4.21 K),liquid helium is used in various cryogenic systems and cryogenic laboratories.The film condensation efficiency of helium is the key for the performance improvement of small-scale helium liquefaction and recon-densation systems using cryocoolers,but there is a lack of targeted theoretical and experimental researches.This study established a CFD model of helium film condensation on vertical surfaces at low temperatures based on existing experimental research.The helium film condensation process on vertical surfaces under different condensing temperature differences was simulated to reveal the heat transfer and liquid film distribution characteristics.This study aims to provide theoretical guidance for the design and optimization of helium condensers in small-scale helium liquefiers.
helium liquefactionfilm condensationCFD simulationliquid filmheat transfer coefficient
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