Start-up and heat transfer characteristics of oscillating heat pipe with different check valve layouts

Ando, Makiko; Okamoto, Atsushi; Nagai, Hiroki

doi:10.1016/j.applthermaleng.2021.117286

Cited by 22 publications

(8 citation statements)

References 19 publications

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“…A multi-scale approach is needed to understand what are the most crucial issues that hinder PHP technological readiness in several fields of application: at the macroscale level they concern the device transient behaviour, especially the start-up phase [14], [15], local dry-outs, also known as thermal crises or instabilities [16], and the quantitative definition of PHP operational limits [13]. These aspects are linked to a number of physical phenomena occurring at the microscale level that are not fully understood, such as: a) the liquid evaporation at the triple line (i.e., the liquid/vapour meniscus line in contact with the inner tube surface at the start-up) [17][18]; b) the characterization of the thin liquid film that surrounds the vapour plugs in different dynamic conditions (thickness, instability etc) [11]; c) the dynamic effects (viscous, inertial) on the rupture of the liquid/vapour menisci and the consequent stability of the slug flow regime [19], [21]; and, d) the detection and characterization of the non-equilibrium thermodynamic states and their role in the heat transfer mechanism [22][23].…”

Section: Current Knowledge Open Issues and Challengesmentioning

confidence: 99%

“…Check valves introduce a certain level of complexity too but they are also more reliable and efficient as described in the paper published in the present issue by Ando et. al [67]. The transparent layout allows to unequivocally infer that, among the different CV layouts, the one where check valves are located closer to the condenser section is preferable both in terms of start-up reliability and of steady-state performance.…”

Section: Flow Stabilization Techniquesmentioning

confidence: 99%

See 1 more Smart Citation

Innovations in pulsating heat pipes: From origins to future perspectives

Mameli

Besagni

Bansal

et al. 2022

Applied Thermal Engineering

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Section: Current Knowledge Open Issues and Challengesmentioning

confidence: 99%

Section: Flow Stabilization Techniquesmentioning

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 use of valves helps PHP to promote and maintain the oscillation cycle of the work medium, which improved the heat transfer performance and stability. Ando et al [131,132] investigated the effect of check valves on PHP start and heat transfer performance. The effective thermal conductivity of the check valve at normal weight is about 6000 W/(m•K), which is 30 times that of conventional aluminum alloy.…”

Section: Valves and Fins Of The Work Mediummentioning

confidence: 99%

Micro-Channel Oscillating Heat Pipe Energy Conversion Approach of Battery Heat Dissipation Improvement: A Review

Xin

Zhu

2022

Energies

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The application of batteries has become more and more extensive, and the heat dissipation problem cannot be ignored. Oscillating Heat Pipe (OHP) is a good means of heat dissipation. In this paper, the methods to improve the energy conversion and flow thermal performance of micro-channel OHP are studied and summarized. The working principle, heat transfer mechanism, advantages and applications of PHP are also introduced in detail in this study. Proper adjustment of the micro-channel layout can increase the heat transfer limit of PHP by 44%. The thermal resistance of two-diameter channel PHP is 45% lower than that of conventional PHP. The thermal resistance of PHP under uneven heating can be reduced to 50% of the original. PHP pulse heating can alleviate the phenomenon of dryness. Different working fluids have different effects on PHP. The use of graphene nano-fluids as the work medium can reduce the thermal resistance of PHP by 83.6%. The work medium obtained by the mixture of different fluids has the potential to compensate for the defects while inheriting the advantages of a single fluid.

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“…Xing et al [2] found that adding cetyltrimethyl ammonium bromide to reduce the surface tension of water can enhance the anti-gravity characteristics of OHP. Zhou et al [3] tested the capability of OHP with non-azeotropic mixture of HFE-7100 and ethanol. The OHP performance highly depend on the mixing ratio.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the performance of oscillating heat pipe with hybrid fluids of ammonia and liquid metal

Huang,

Yu,

Chen

2024

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

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Oscillating heat pipe (OHP), as a heat transfer element, has a broad application prospect in the conversion and utilization of waste heat generated by mechanical equipment and thermal management of chip in intelligent manufacturing system. How to improve the heat capability of the OHP to enhance its applicability has always been a research hotspot. Liquid metal is used to improve the heat capability of the OHP in this paper. The evaporator, adiabatic and condenser lengths of the OHP are 40 mm, 51 mm and 64 mm, respectively. The effects of liquid metal volume fraction, heating power and angle on the start-up and heat capability of the OHP were studied experimentally. The results show that adding liquid metal will increase the start-up temperature and start-up time. When the heating power is greater than 100W, liquid metal can enhance the heat capability of the OHP, and the thermal resistance first decreases and then increases with the increase of the volume fraction of liquid metal. When the OHP is placed vertically and the heating power is 350W, compared with the pure ammonia OHP, the heat capability of the OHP with liquid metal volume fraction of 2.43% is enhanced by 10.45%.

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Start-up and heat transfer characteristics of oscillating heat pipe with different check valve layouts

Cited by 22 publications

References 19 publications

Innovations in pulsating heat pipes: From origins to future perspectives

Innovations in pulsating heat pipes: From origins to future perspectives

Micro-Channel Oscillating Heat Pipe Energy Conversion Approach of Battery Heat Dissipation Improvement: A Review

Experimental study on the performance of oscillating heat pipe with hybrid fluids of ammonia and liquid metal

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