Abstract
RESEARCH AND DEVELOPMENT OF LOOP HEAT PIPE – A REVIEW
Highlights
With fast development of electronic devices, novel strategies of thermal management have been received great attention to dissipate high heat fluxes
This paper introduced the working principle, the mechanism of thermal cycle and the advantages of loop heat pipe compared with other heat pipes, and summarized the development status of loop heat pipe in the aspects of wick structure, start-up performance, temperature fluctuation, anti-gravity operation and effects of various physical parameters on the heat transfer performance
(1) Seen from the operation characteristics, the loop heat pipe belongs to the heat pipe with vapor-liquid phase separation, indicating relatively different from other heat pipes
Summary
Future thermal management system should pay attention to the simplicity of structure and reliability of performance, avoid the introduction of. If the porous wick short of liquid medium, the vapor will enter the compensation chamber through wicks, so the "water lock failed" could result in "heat lock failed" These two functions of porous wicks ensure a stable circulation of working fluid from the steam line to the compensation chamber, and continuously transfer heat to the condenser and discharge it. It indicates that the porous wick plays a critical role in the LHP. Both of them are phase-change heat transfer processes driven by capillary forces, the difference is that the LHP separates the relative movements of the steam and liquid in the heat pipe, which well solves the conflict and contradiction between steam and liquid in the flow aspects
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