Experimental study on hydrogen pulsating heat pipes under different number of turns

Sun, Ximing; Li, Sizhuo; Ji, Bo; Gan, Zhihua; Pfotenhauer, John M.; Wang, Bo; Zhao, Qinyu; Liu, Dongli

doi:10.1016/j.cryogenics.2020.103174

Cited by 24 publications

(6 citation statements)

References 29 publications

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“…The research team lead by Prof Pfotenhauer focussed on the investigation of helium [88] and hydrogen [90] CLPHPs in vertical bottom heated mode, reporting remarkable equivalent thermal conductivities, especially when the device is filled with helium [88]. In this special issue Pfotenhauer et al [91] raised the issue that in a practical application of PHPs in a superconducting magnet, the path between the cryocooler and the magnet shall likely consist of both horizontal and vertical sections ("L" profile) and proposed an analysis on the effect of the vertical to horizontal aspect ratio on the thermal performance of CLPHP charged with helium and hydrogen.…”

Section: Cryogenic Applicationsmentioning

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: Cryogenic Applicationsmentioning

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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“…When the turns number is too less, the oscillation of the work medium in the pipe is easier to stop. There is no recognized standard for the selection of PHP turns, which hinders the large-scale application of PHP [105]. Qian N et al [106] described the startup process of single loop PHP through the second-order dynamic system control equation.…”

Section: Characteristics Of Turnsmentioning

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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“…The published experimental studies with the key parameters and heat transfer performance are summarized in Table 1. Our team specifically focused on researching PHPs with hydrogen [20]. Experimental investigations have been conducted to explore the effects of key factors, such as filling ratios, number of turns, length of adiabatic section, and heating modes.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Heat Transfer and Fluid Flow Characteristics of a Hydrogen Pulsating Heat Pipe with Medium Filling Ratio

Yang,

Bu,

Jiao

et al. 2024

Energies

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Benefiting from its high thermal conductivity, simple structure, and light weight, the pulsating heat pipe (PHP) can meet the requirements for high efficiency, flexibility, and low cost in industrial heat transfer applications such as aerospace detector cooling and vehicle thermal management. Compared to a PHP working at room temperature, the mechanism of a PHP with hydrogen as the working fluid differs significantly due to the unique thermal properties of hydrogen. In this paper, a two-dimensional model of a hydrogen PHP with a filling ratio of 51% was established to study the flow characteristics and thermal performance. The volume of fluid (VOF) method was used to capture the phase distribution and interface dynamics, and the Lee model was employed to account for phase change. To validate the model, a comparison was conducted between the simulation results and experimental data obtained in our laboratory. The simulation results show that the pressure and temperature errors were within 25% and 5%, respectively. Throughout a pressure oscillation cycle, the occurrence of uniform flow velocity, acceleration, and flow reversal can be attributed to the changes in the vapor–liquid phase distribution resulting from the effect of condensation and evaporation. In addition, when the fluid velocity was greater than 0.6 m/s, dynamic contact angle hysteresis was observed in the condenser. The results contribute to a deeper understanding of the flow and heat transfer mechanism of the hydrogen PHPs, which have not been yet achieved through visualization experiments.

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Experimental study on hydrogen pulsating heat pipes under different number of turns

Cited by 24 publications

References 29 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

Numerical Study of Heat Transfer and Fluid Flow Characteristics of a Hydrogen Pulsating Heat Pipe with Medium Filling Ratio

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