Interaction of flow pattern and heat transfer in oscillating heat pipes for hot spot applications

Schwarz, Florian; Uddehal, Shabhrish Reddy; Lodermeyer, Alexander; Bagheri, Eman; Forster-Heinlein, Brigitte; Becker, Stefan

doi:10.1016/j.applthermaleng.2021.117334

Cited by 17 publications

(4 citation statements)

References 35 publications

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“…The review by Ayel et al also thoroughly discusses the physical phenomena occurring in FPPHPs with a focus on capillary flows in square/rectangular channels which is actually the other main difference with respect to the tubular assessment. It is worth to mention here indeed that transparent FPPHP assessments can be obtained in a relatively easier way with respect to the tubular layout and usually allow full visual inspection, offering wider opportunities of phenomenological investigations [32]. In this case, due to the unavoidable presence of sealings or plastic materials that are permeable to noncondensable gases, the long-term operation is overlooked in favour of the physical investigation.…”

Section: Flat Plate Pulsating Heat Pipesmentioning

confidence: 99%

Innovations in pulsating heat pipes: From origins to future perspectives

Mameli

Besagni

Bansal

et al. 2022

Applied Thermal Engineering

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Section: Flat Plate Pulsating Heat Pipesmentioning

confidence: 99%

Innovations in pulsating heat pipes: From origins to future perspectives

Mameli

Besagni

Bansal

et al. 2022

Applied Thermal Engineering

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“…The results show that when the heating power is high, the flow pattern changes to a unidirectional circulation. Florian et al [3] used high speed camera to visualize the flow pattern in acetone OHP under local heating conditions. The results showed that the flow velocity of the working fluid is closely related to heat transfer performance.…”

Section: Introductionmentioning

confidence: 99%

Visualization of flat-plate oscillating heat pipe by infrared thermal imaging

Zhang,

Yan,

et al. 2024

Fourth International Conference on Mechanical Engineering, Intelligent Manufacturing, and Automation Technology (MEMAT 2023)

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In this paper, the flow patterns of flat-plate oscillating heat pipe (FPOHP) at different operation stages were analyzed by infrared thermal imaging. The FPOHP with a working fluid of HFE-347 and a heating power of 20W to 140W was placed vertically. A high speed camera is used to record the flow direction and state of the working fluid in the FPOHP, and the temperature distribution of the FPOHP at different operation stages is recorded by infrared thermal imager. The experimental results show that the flow pattern of the FPOHP can be divided into non-oscillation stage, transition stage and stable operation stage according to the different flow state of working fluid. The temperature distribution presented by infrared thermal image is synchronous with the wall temperature fluctuation of FPOHP and the change of the working fluid flow direction. The flow pattern of the working fluid and the heat transfer performance of FPOHP can be qualitatively judged by infrared thermal imaging.

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“…There are many studies on oscillating heat pipes in static conditions, mainly from heat transfer performance [13][14][15][16][17][18][19][20], visualization [21][22][23][24][25][26][27], and numerical simulation studies [28][29][30][31][32][33][34]. However, relatively few studies exist on rotating oscillating heat pipes compared to OHP.…”

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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Interaction of flow pattern and heat transfer in oscillating heat pipes for hot spot applications

Cited by 17 publications

References 35 publications

Innovations in pulsating heat pipes: From origins to future perspectives

Innovations in pulsating heat pipes: From origins to future perspectives

Visualization of flat-plate oscillating heat pipe by infrared thermal imaging

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

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