Effect of aspect ratio on saturated flow boiling in microchannels

Markal, Burak; Aydın, Orhan; Avcı, Mete

doi:10.1016/j.ijheatmasstransfer.2015.10.024

Cited by 103 publications

(37 citation statements)

References 31 publications

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“…As can be seen from Figure 11A, the microchannel with a large hydraulic diameter has a smaller pressure drop, and the microchannel with a smaller hydraulic diameter has a larger pressure drop. There is no clear relationship between the aspect ratio and the two-phase pressure drop, which is similar to the conclusion of Markal et al 11 Because of the instability of the flow boiling, the value of the two-phase pressure drop fluctuates with time, and the amplitude of the fluctuation is also large. This also shows the complexity of this physical phenomenon.…”

Section: Pressure Dropsupporting

confidence: 71%

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Effect of aspect ratio on saturated boiling flow in microchannels with nonuniform heat flux

Yan

2019

Heat Trans. Asian Res.

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Microchannel two‐phase flow is an effective cooling method used in microelectronics, in which the heat flux density is unevenly distributed usually. The paper is focused on numerical study the effect of aspect ratio on the flow boiling of microchannels with nonuniform heat flux. The heat source is a three‐dimensional (3D) integrated circuit. 3D microchannel model and volume of fluid method are coupled in numerical simulation. The results show that the aspect ratio has no relationship with the two‐phase pressure drop of the microchannel. It has a certain influence on the distribution of bubble shape. In terms of the heat transfer coefficient, the aspect ratio has a certain influence on a section of the inlet. Due to the nucleate boiling, the convective heat transfer in the remaining areas is the dominant factor and the average heat transfer coefficient is mainly determined by the heat flux at the bottom of the channel.

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Section: Pressure Dropsupporting

confidence: 71%

“…Flow boiling of microchannels with different aspect ratios has also been extensively studied. Markal et al studied the saturated flow boiling characteristics of deionized water in microchannels with different aspect ratios, the height of microchannels was 100 μm. The aspect ratio was changed by changing the width of different channels.…”

Section: Introductionmentioning

confidence: 99%

Effect of aspect ratio on saturated boiling flow in microchannels with nonuniform heat flux

Yan

2019

Heat Trans. Asian Res.

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“…A significant number of researchers reported that the flow boiling pressure drop increased with increasing mass flux and heat flux [1][2][3][4][5][6][7][8][9][10][11]. Lee and Mudawar [1] investigated the flow boiling pressure drop characteristics in a copper rectangular parallel microchannel (Dh = 0.35 mm) using R-134a as the working fluid.…”

Section: Introductionmentioning

confidence: 99%

“…The channel aspect ratio effect on the flow boiling pressure drop is examined in the literature by for example [4,6,15,16]. Harirchian and Garimella [15], stated that channels having similar cross-sectional area but different aspect ratio exhibited almost similar flow boiling pressure drop values.…”

Section: Introductionmentioning

confidence: 99%

“…This explanation may be applicable only for bubbly flow and it did not explain the high pressure drop in annular flow. Markal et al [4] carried out an experimental study with de-ionised water in six rectangular microchannels (Dh = 0.1 mm, L = 48 mm, β = 0.37 -5). They reported that there is no "regular" relationship between pressure drop and the channel aspect ratio.…”

Section: Introductionmentioning

confidence: 99%

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Flow Boiling Pressure Drop Characteristics in a Rectangular Metallic Microchannel

Özdemir¹,

Mahmoud²,

Karayiannis³

2019

Proceedings of the 5th World Congress on Mechanical, Chemical, and Material Engineering

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The research presented in this paper is a part of long research programme on flow boiling in rectangular metallic microchannels. The present experiments were conducted in three rectangular oxygen-free copper microchannels with the same hydraulic diameter (Dh = 0.56 mm) and length (L = 62 mm) but different aspect ratios (β = width/height = 0.5, 2.56 and 4.94). The range of mass flux and heat flux was between 200-800 kg/m 2 s and 4-1350 kW/m 2 respectively with an inlet subcooling of ~14 K. The results consistently indicated that the flow boiling pressure drop increased monotonically with heat and mass flux. Also, the flow boiling pressure drop increased with increasing vapour quality. The flow boiling pressure drop was found to increase with the decreasing channel aspect ratio. The experimental flow boiling pressure drop data were compared with widely used macro and micro scale correlations. The macro-scale correlations could not predict the experimental data well, while some of micro-scale correlations predicted the experimental results reasonably well.

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Research progress of the liquid cold plate cooling technology for server electronic chips: A review

Zhou

Dong

Sun

et al. 2022

Intl J of Energy Research

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A significant quantity of research has been dedicated to the application of liquid cold plates to eliminate the high heat flux in server electronic chips. Traditional parallel straight microchannel liquid cold plates suffer from low heat flux density with uneven flow distribution, which poses a serious challenge to high-performance server chip heat dissipation. This paper reviews recent research progress in geometry optimization, interrupted structures, channel patterns, and two-phase flow of liquid cold plates. The optimal geometry parameters of rectangular cross-sectional microchannels including the aspect ratio, length, and hydraulic diameter are summarized. Inquest of higher thermal performance, various interrupted structures (ribs, pin fins, etc.), special channel patterns (wavy-shaped, zigzag-shaped, fractal, serpentine, and doublelayered microchannels, etc.), and two-phase flow on the liquid cold plate are applied to promote fluid-turbulivity and increase heat transfer area, meanwhile they lead to more pressure drop. Furthermore, it is an essential approach to commercialize liquid cold plates by applying the academic and prototype of the liquid cold plate to manufacturing and liquid cooling system solutions. In the end, this review provides a discussion about the limitations of current research on liquid cold plates and an outlook on future research directions.

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Effect of aspect ratio on saturated flow boiling in microchannels

Cited by 103 publications

References 31 publications

Effect of aspect ratio on saturated boiling flow in microchannels with nonuniform heat flux

Effect of aspect ratio on saturated boiling flow in microchannels with nonuniform heat flux

Flow Boiling Pressure Drop Characteristics in a Rectangular Metallic Microchannel

Research progress of the liquid cold plate cooling technology for server electronic chips: A review

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