Thermal spreading characteristics of novel radial pulsating heat pipes with diverging nonuniform channels

Jang, Dong Soo; Cho, Wonhee; Ham, Se Hyeon; Kim, Yongchan

doi:10.1016/j.ijheatmasstransfer.2022.123488

Cited by 7 publications

(1 citation statement)

References 32 publications

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“…Heat transfer performance of rar-OHPs is correlated with the dimensionless number, according to Liu et al [46]. The non-uniform arrangement helps the RR-OHP to circulate unidirectionally, so the heat transfer performance is good [47]. Chen et al investigated the change in the flow pattern of RR-OHP and AR-OHP at a =40 m/s 2 [48,49], but the visualization study with higher centrifugal acceleration was not addressed.…”

Section: Introductionmentioning

confidence: 99%

Visualization Experiments of Radial-Rotating Oscillating Heat Pipe Filled with Methanol

Wang,

Qian,

2023

Glob. J. Energ. Technol. Res. Updat.

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Oscillating heat pipes (OHP) have highly efficient heat transfer capability. Some researchers have applied OHPs to cutting tools and rotating machines by embedding tubular OHPs in machines or by making flow channels on metal plates. Most studies are on heat transfer performance, and there are few studies on the heat transfer behavior of radial-rotating oscillating heat pipes (RR-OHP) under operating conditions. This paper conducted the visualization test of an RR-OHP filled with methanol by studying the flow patterns and motion modes at rotation speed (0-860 rpm) and heat flux (20000-40000 W/m2). When the heat flux is increased from 20000 W/m2 to 40000 W/m2, the flow patterns include flowless, slug flow, annular flow, and churn flow, and the motion modes contain oscillatory motion, cyclic motion, unilateral boiling, and bilateral boiling. The distribution map of the flow patterns and motion modes with the centrifugal acceleration and the heat flux was plotted, which shows the evolution of the flow patterns and the transformation of the motion modes of the RR-OHP, and elucidates the effect of the centrifugal acceleration and the heat flux on the flow patterns and motion modes.

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