An experiment and three-dimensional numerical simulation of pulsating heat pipes

Vo, Duy-Tan; Kim, Hyoung-Tak; Ko, Junghyuk; Bang, Kwang-Hyun

doi:10.1016/j.ijheatmasstransfer.2020.119317

Cited by 32 publications

(8 citation statements)

References 18 publications

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“…The dominant fluid oscillation frequency increases with the power input (Figs. [15][16], and the fluid oscillations become more and more repeatable within the overall device, thus denoting a full activation of the PHP. However, power spectrum of Fig.…”

Section: Frequency Analysismentioning

confidence: 95%

“…In fact, during fluid oscillations and flow reversal phenomena, the wall-to-fluid heat flux provided information about the flow direction, although the fluid motion assessment is usually achieved by means of either intrusive techniques, i.e. temperature-pressure transducers directly inserted in the fluid flow and transparent inserts [10,11,12], or by using transparent PHPs for the direct fluid visualisation [13,14,15]. The effectiveness of the non-intrusive IR measurements for the fluid motion assessment was also pointed out by Karthikeyan et al [16], who studied a multi-turn PHP for different heat load to the evaporator without any direct fluid visualisation, even though no local heat flux was here estimated.…”

Section: Introductionmentioning

confidence: 99%

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Thermal characterization of a multi-turn pulsating heat pipe in microgravity conditions: Statistical approach to the local wall-to-fluid heat flux

Pagliarini

Cattani

Bozzoli

et al. 2021

International Journal of Heat and Mass Transfer

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Section: Frequency Analysismentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Thermal characterization of a multi-turn pulsating heat pipe in microgravity conditions: Statistical approach to the local wall-to-fluid heat flux

Pagliarini

Cattani

Bozzoli

et al. 2021

International Journal of Heat and Mass Transfer

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“…The liquid is transferred owing to the pressure difference between the evaporator and condenser. However, the liquid return in RHP depends on the centrifugal force 236‐290 . There are two types of RHPs; axial RHP and radial RHP.…”

Section: Thermal Management Of Pem Fuel Cells and Gaps In Technologymentioning

confidence: 99%

Factors influencing the performance of PEM fuel cells: A review on performance parameters, water management, and cooling techniques

Singh

Oberoi

Singh

2021

Intl J of Energy Research

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Summary This paper addresses the effects of critical parameters that affect the performance and lifespan of proton exchange membrane (PEM) fuel cells. Amongst all, control of excess water content and dehydration in PEM fuel cells is the major issue under various operating conditions. Therefore, their effects on cathode, anode, gas diffusion layer (GDL), catalyst layer (CL), and flow channels are summarized in the initial part of this paper. Various active cooling strategies such as air cooling, liquid cooling, and phase change method to extract the waste heat from the stack are represented. The lateral part of this paper throws light on the role of heat pipes, working fluid, and the effect of the addition of nanofluid with pertinent filling ratio (FR) in cooling of PEM fuel cells. This work is intended to aid the selection of cooling methods for PEM fuel cells through the consideration of the variety of affecting parameters preceding major expenditure for wide‐scale production. In future, cost comparison associated with the cooling techniques of the fuel cell would be evaluated.

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“…); in this way, it is possible not only to capture the overall performance in some particular regimes, but also describe transitions between them and consider the temporal evolution of various PHP parameters; the latter feature is essential for such a non-stationary system as the PHP. Vo et al [25] modeled the 3D flow in PHP by using the ANSYS Fluent ® software that captured qualitatively the circulating plug motion observed experimentally. With the same software, Wang et al [26] simulated a miniature single loop PHP in 2D to investigate the effects of tube constrictions in the condenser zone.…”

Section: Introductionmentioning

confidence: 99%

Experimental analysis and transient numerical simulation of a large diameter pulsating heat pipe in microgravity conditions

Abela,

Mameli,

Nikolayev

et al. 2022

Preprint

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A multi-parametric transient numerical simulation of the start-up of a large diameter Pulsating Heat Pipe (PHP) specially designed for future experiments on the International Space Station (ISS) are compared to the results obtained during a parabolic flight campaign supported by the European Space Agency. Since the channel diameter is larger than the capillary limit in normal gravity, such a device behaves as a loop thermosyphon on ground and as a PHP in weightless conditions; therefore, the microgravity environment is mandatory for pulsating mode. Because of a short duration of microgravity during a parabolic flight, the data concerns only the transient start-up behavior of the device. One of the most comprehensive models in the literature, namely the in-house 1-D transient code CASCO (French acronym for Code Avancé de Simulation du Caloduc Oscillant: Advanced PHP Simulation Code in English), has been configured in terms of geometry, topology, material properties and thermal boundary conditions to model the experimental device. The comparison between numerical and experimental results is performed simultaneously on the temporal evolution of multiple parameters: tube wall temperature, pressure and, wherever possible, velocity of liquid plugs, their length and temperature distribution within them. The simulation results agree with the experiment for different input powers. Temperatures are predicted with a maximum deviation of 7%. Pressure variation trend is qualitatively captured as well as the liquid plug velocity, length and temperature distribution. The model also shows the ability of capturing the instant when the fluid pressure begins to oscillate after the heat load is supplied, which is a fundamental information for the correct design of the engineering model that will be tested on the ISS. We also reveal the existence of strong liquid temperature gradients near the ends of liquid plugs both experimentally and by simulation. Finally, a theoretical prediction of the stable functioning of a large diameter PHP in microgravity is given. Results show that the system provided with an input power of 185 W should be able to reach the steady state after 1 min and maintain a stable operation from then on.

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An experiment and three-dimensional numerical simulation of pulsating heat pipes

Cited by 32 publications

References 18 publications

Thermal characterization of a multi-turn pulsating heat pipe in microgravity conditions: Statistical approach to the local wall-to-fluid heat flux

Thermal characterization of a multi-turn pulsating heat pipe in microgravity conditions: Statistical approach to the local wall-to-fluid heat flux

Factors influencing the performance of PEM fuel cells: A review on performance parameters, water management, and cooling techniques

Experimental analysis and transient numerical simulation of a large diameter pulsating heat pipe in microgravity conditions

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