The influence of aspect ratio on the thermal performance of a cryogenic pulsating heat pipe

Pfotenhauer, John M.; Sun, Ximing; Berryhill, Adam; Shoemaker, C. B.

doi:10.1016/j.applthermaleng.2021.117322

Cited by 22 publications

(4 citation statements)

References 16 publications

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“…Second, the cells in the evaporation section that are closer to the centerline have a similar temperature to the cells in the adiabatic section. This feature reflects that most of the temperature difference between the evaporator and adiabatic section occurs at the wall-fluid interface, an observation in keeping with other reported studies (Pfotenhauer et al [8])…”

Section: Visualized Temperaturesupporting

confidence: 91%

CFD Modelling of a Helium Cryogenic Pulsating Heat Pipe

Pfotenhuaer

Miller

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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This paper explores the development of a 3D model using ANSYS Fluent to characterize the two-phase (gas/liquid) flow of helium in a cryogenic pulsating heat pipe. The model includes condensation and evaporation phenomena and uses the VOF model to capture aspects of the two phase flow. Temperature dependent properties were applied for helium in the range of 2.2 K and 20 K. Bubble formation and movement were observed, as well as flow direction at various times in each of the individual pipes. Grid independence tests were performed by plotting the average temperature of different sections. The influence of the number of turns on the performance of PHP is also investigated.

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Section: Visualized Temperaturesupporting

confidence: 91%

CFD Modelling of a Helium Cryogenic Pulsating Heat Pipe

Pfotenhuaer

Miller

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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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. As expected, the thermal performance increases with the aspect ratio.…”

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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“…A single 8-turn configuration displayed a maximum effective conductivity of 15600 kW/m-K, larger than the 48-turn configuration at 12300 kW/m-K. Likewise, Pfotenhauer et al [5] studied the effect of the vertical-to-horizontal aspect ratio of L-shaped helium PHPs. All adiabatic lengths were 1 m, and five aspect ratios from 4:1 to 1:4 were tested.…”

Section: Background and Motivationmentioning

confidence: 99%

The design of an extended length helium pulsating heat pipe experiment

Kossel

Pfotenhauer

Miller

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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Pulsating heat pipes, also known as PHPs, are passive two-phase heat transfer devices capable of moving heat at cryogenic temperatures with high effective thermal conductivities around two orders of magnitude higher than copper. A recent Helium Pulsating Heat Pipe experiment demonstrated a surprising phenomenon, where Helium PHPs of different lengths (300 mm and 1000 mm) displayed the same thermal conductance at equal heat loads. The purpose of this research is to experimentally characterize this apparent length-independence and determine the size limits for Helium PHPs. An experimental approach is developed where three additional Helium PHP experiments will be conducted with the same operating parameters as the original experiment except with extended adiabatic lengths – 1.25 m, 1.5 m, and 1.75 m. All PHPs considered in this study are in the vertical orientation and are bottom-heated. This will give five complete sets of data from which the influence of length on helium pulsating heat pipes’ performance may be analysed. This paper serves as a work-in-progress report describing the experimental design and fabrication of these Helium PHP experiments.

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The influence of aspect ratio on the thermal performance of a cryogenic pulsating heat pipe

Cited by 22 publications

References 16 publications

CFD Modelling of a Helium Cryogenic Pulsating Heat Pipe

CFD Modelling of a Helium Cryogenic Pulsating Heat Pipe

Innovations in pulsating heat pipes: From origins to future perspectives

The design of an extended length helium pulsating heat pipe experiment

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