Predicting the performance of a loop heat pipe considering evaporation from the meniscus at the three-phase contact line

Yamada, Yuya; Nishikawara, Masahito; Yanada, Hideki; Ueda, Yosuke

doi:10.1016/j.tsep.2019.03.022

Cited by 16 publications

(2 citation statements)

References 18 publications

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“…Because of wettability, the menisci form at all corners of the grooves unless the wick is two-phase state. The effect of the meniscus which is affected by pressure difference at the liquid-vapor interface and two contact angles with the wick and the casing might be significant, especially at low heat flux (Yamada et al, 2019), as the meniscus can direct the applied heat to the groove. It is considered that the simulation underestimated the heat transfer at the TPCL.…”

Section: Heat-transfer Coefficient (W/m 2 K)mentioning

confidence: 99%

Numerical exploration of optimal microgroove shape in loop-heat-pipe evaporator

Yamada

Nishikawara

Yanada

2020

JTST

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A loop heat pipe (LHP) is a heat transport device driven by capillary pressure in porous media and the vapor-liquid phase change of a working fluid. LHPs are widely used in the electronic cooling systems of spacecraft (Okamoto et al., 2016), insulated gate bipolar transistors (Dupont et al., 2013), laptops (Lin et al., 2013), and other thermal engineering applications. As shown in Fig. 1, an LHP consists of an evaporator, a condenser, a vapor line, a liquid line, and a compensation chamber (CC). Unlike conventional heat pipes, the wick is enclosed in the evaporator, enabling long transport lengths and large radiation areas. The operating characteristics and working mechanisms of LHPs are reviewed in Maydanik (2005), Ku (1999), and Launay et al. (2007). The wick shape as well as porous materials and capillary structures critically affects the evaporator performance, but the design of the wick shape is complicated, which is focused in this paper. Some papers have attempted enhancement of the evaporator heat-transfer coefficient by parametric studies with respect to the shape (e.g., contact surface area between casing and wick, groove number, groove width, groove pitch, groove cross-sectional shape, groove location (in a wick or casing) and wick thickness) with a cylindrical or flat evaporator (

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Section: Heat-transfer Coefficient (W/m 2 K)mentioning

confidence: 99%

Numerical exploration of optimal microgroove shape in loop-heat-pipe evaporator

Yamada

Nishikawara

Yanada

2020

JTST

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“…The different vapor-liquid phase distributions brought the different temperature profile during the process of start-up. Yamada et al [47] carried out a visualization experiment for the quartz wick-acetone LHP with a glass tube evaporator. Their results demonstrated two vapor-liquid phase states at the casewick contact surface.…”

Section: Introductionmentioning

confidence: 99%