Improved two-phase flow boiling in a minichannel heat sink for thermal management of information and communication technology (ICT) equipment

Hong, Sihui; Dang, Chaobin; Hihara, Eiji; Sakamoto, Hitoshi; Wada, Mizuki

doi:10.1016/j.applthermaleng.2020.115957

Cited by 11 publications

(3 citation statements)

References 32 publications

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“…The heat transfer performance of the expanded microchannel was 1.5 times greater than that of the straight microchannel, and the frictional pressure drop was reduced by 2/3. Additionally, we recently conducted visualization experiments to confirm the beneficial impact of expanded microchannels on enhancing flow boiling behaviors [22][23][24][25]. The results suggested that the use of expanding microchannels allows for the maintenance of stable flow boiling, even under conditions of low inlet inertia and two-phase flow.…”

Section: Introductionmentioning

confidence: 92%

“…In order to comprehend and enhance the thermal performance of PHP, researchers have conducted a series of investigations. Parameters that impact the heat transfer performance of pulsating heat pipes can be roughly categorized into three groups: (1) Geometric parameters of PHPs: pipe diameter [5][6][7], section shape [8][9][10][11], channel structure [5,[12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28], length of evaporating and condensing section [29,30], number of turns [16,31,32], etc. (2) Physical characteristics of working medium filling in PHP [33,34]: surface tension, latent heat, dynamic viscosity, etc.…”

Section: Introductionmentioning

confidence: 99%

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An Experimental Investigation on the Heat Transfer Characteristics of Pulsating Heat Pipe with Adaptive Structured Channels

Yu,

Hong,

Koudai

et al. 2023

Energies

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In recent years, the development of electronic chips has focused on achieving high integration and lightweight designs. As a result, pulsating heat pipes (PHPs) have gained widespread use as passive cooling devices due to their exceptional heat transfer capacity. Nevertheless, the erratic pulsations observed in slug flow across multiple channels constitute a significant challenge, hindering the advancement of start-up and heat dissipation capabilities in traditional PHP systems. In this paper, we introduce a flat plate pulsating heat pipe (PHP) featuring adaptive structured channels, denoted as ASCPHP. The aim is to enhance the thermal performance of PHP systems. These adaptive structured channels are specifically engineered to dynamically accommodate volume changes during phase transitions, resulting in the formation of a predictable and controllable two-phase flow. This innovation is pivotal in achieving a breakthrough in the thermal performance of PHPs. We experimentally verified the heat transfer performance of the ASCPHP across a range of heating loads from 10 to 75 W and various orientations spanning 0 to 90 degrees, while maintaining a constant filling ratio (FR) of 40%. In comparison to traditional PHP systems, the ASCPHP design, as proposed in this study, offers the advantage of achieving a lower evaporation temperature and a more uniform temperature distribution across the PHP surface. The thermal resistances are reduced by a maximum of 37.5% when FR is 40%. The experimental results for start-up characteristics, conducted at a heating power of 70 W, demonstrate that the ASCPHP exhibits the quickest start-up response and the lowest start-up temperature among the tested configurations. Furthermore, thanks to the guiding influence of adaptive structured channels on two-phase flow, liquid replenishment in the ASCPHP exhibits minimal dependence on gravity. This means that the ASCPHP can initiate the start-up process promptly, even when placed horizontally.

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Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

An Experimental Investigation on the Heat Transfer Characteristics of Pulsating Heat Pipe with Adaptive Structured Channels

Yu,

Hong,

Koudai

et al. 2023

Energies

Self Cite

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“…The heat sink technology also has been adopted by a larger heat exchanging system with minichannels with hydraulic diameter range between 200 µm to 3 mm while microchannel range between 10 µm to 200 µm according to the classification by Kandlikar and Grande 12) . The technology advances into radial movement expanding system 13,14) , complex wall geometry such as triangular cavities 15) and zig-zag to increase surface area for convection 16) , and topology design to decrease pressure drop 17) . However, some of these innovations are limited to minichannels only.…”

Section: Introductionmentioning

confidence: 99%

Effect of Wall Resistance on the Total Thermal Resistance of a Stacked Microchannel Heat Sink

Shamsuddin¹,

Abidin²,

Abd-Zaidan³

et al. 2021

Evergreen

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This paper reports on the different modeling approach of the total thermal resistance in a microchannel heat sink (MCHS); with wall resistance and the frequently used fin model, in comparison with experimental results. For a single stack MCHS, the wall model caused more than 10% difference but it can be extended to a stacked MCHS while the fin model could not, due to the adiabatic top condition. The wall resistance model is idealized, assuming a 100% efficient convective heat transfer while in the fin model 70% was the maximum. Meanwhile, stacking showed that at a constant flow rate, the thermal resistance could be reduced by 3% for a double stack, while increasing beyond that will decrease the thermal performance of the MCHS. The study showed the limits of models used and possible stacking of a MCHS for improved heat removal capability.

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Experimental and numerical study on two-phase minichannel cold plate for high-power device

Zhang

Yi²,

Liu

2023

Applied Thermal Engineering

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Improved two-phase flow boiling in a minichannel heat sink for thermal management of information and communication technology (ICT) equipment

Cited by 11 publications

References 32 publications

An Experimental Investigation on the Heat Transfer Characteristics of Pulsating Heat Pipe with Adaptive Structured Channels

An Experimental Investigation on the Heat Transfer Characteristics of Pulsating Heat Pipe with Adaptive Structured Channels

Effect of Wall Resistance on the Total Thermal Resistance of a Stacked Microchannel Heat Sink

Experimental and numerical study on two-phase minichannel cold plate for high-power device

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