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Relationship between Phase Distribution and Heat-Transfer Coefficient Of Loop Heat Pipe Evaporator Investigated by Lateral Observation of Porous Media

SSRN, ISSN: 1556-5068
2023
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Metric Options:   Counts1 Year3 Year

Metrics Details

  • Usage
    104

Article Description

Loop heat pipes (LHPs) that passively operate, need no electric power, and can be flexibly arranged are promising in thermal control systems for both terrestrial and aerospace applications. Understanding the two-phase state in the porous media of the capillary evaporator induced by nucleate boiling is the key to enhancing the evaporator performance. This study visualizes the liquid–vapor (L–V) phase distribution on the contact surface between the cylindrical evaporator casing and the wick to investigate the L–V phase distribution and its relationship with the evaporator heat transfer coefficient. The observed results show the phase transition from a liquid-saturated to a two-phase state of the wick by nucleation boiling and the evolution of the L–V phase distribution with the changing heat load. In conclusion, the relationship between the heat-transfer coefficient and the length of the three-phase contact line within the heated casing, liquid, and vapor phases is discovered.

Bibliographic Details

Masahito Nishikawara; Shohei Tomita; Hiroshi Yokoyama; Hideki Yanada

Elsevier BV

Multidisciplinary; Capillary Evaporator; Liquid-Vapor Interface; Porous Media; Three-Phase Contact Line; Visualization

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