Numerical study on significance of wave amplitude, wavelength and aspect ratio on heat transfer and fluid flow characteristics in circular wavy MC heat sink design

Kumar, Valaparla Ranjith; Balasubramanian, Karthik; Kumar, K. Kiran

doi:10.1177/0954406221989378

Cited by 3 publications

(5 citation statements)

References 33 publications

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“…Due to this kind of structure, pressure drop reduction occurred in combination with the permeation effect and the slip effect of the coolant. Recently, Kumar et al 78 concluded that circular wavy microchannel with higher wave amplitude (0.45 mm), smaller wavelength (5 mm), and smaller aspect ratio ( AR = 2) gave higher heat transfer efficiency with corresponding pressure drop. Nemati et al 77 implemented the multi‐objective genetic algorithm.…”

Section: Channel Patternmentioning

confidence: 99%

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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Section: Channel Patternmentioning

confidence: 99%

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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“…Dean number: It represents the ratio of product of inertial force and centripetal force to the viscous force. The local Dean number 26 can be given as…”

Section: Computational Model and Numerical Proceduresmentioning

confidence: 99%

“…It represents the ratio of product of inertial force and centripetal force to the viscous force. The local Dean number 26 can be given as

{De}_{x} goodbreak= {Re}_{x} \sqrt{\frac{D_{h_{x}}}{2 R_{c}}}

where R c = radius of curvature.…”

Section: Computational Model and Numerical Proceduresmentioning

confidence: 99%

“…It was concluded that secondary branches were only a viable method of increased heat transfer at Reynolds number <100. Ranjith et al 25,26 numerically investigated the effect of wave length, wave amplitude and aspect ratio to evaluate the thermo‐hydraulic performance of circular wavy microchannels. They found that while keeping other parameters constant, the Nusselt number increases with increase in wave amplitude, decrease in wavelength or decrease in aspect ratio.…”

Section: Introductionmentioning

confidence: 99%

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Influence of secondary flow channels on heat transfer and fluid flow characteristics in curved microchannel

Mamidi

Balasubramanian

Kupireddi

et al. 2022

Asia-Pacific J Chem Eng

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Microchannel-assisted cooling technologies have found extremely suitable for compact heat exchangers surpassing conventional fan-assisted heat sink solutions. Though extensive research was done on straight channels, research on curved microchannel is scant. In the present study, hydraulic flow characteristics and cooling performance of curved microchannel with secondary flow (CMCSF) with four different oblique angles are investigated numerically and compared with conventional curved microchannel (CCMC). A 3D conjugate heat transfer analysis is performed for four CMCSFs and CCMC using commercial software ANSYS Fluent with Reynolds number (Re) ranging between 125 and 325. A part of fluid from main channel is diverted into the secondary channels, leading to re-initialization of boundary layers. Also, this diverted flow that is fed into adjacent main channels consecutively results in better fluid mixing. Owing to these two phenomena, there is a huge enhancement in heat dissipation through the channel. The results revealed a Nusselt number increment of up to 80.12% for CMCSF in comparison with CCMC. Moreover, the average wall temperature was recorded lowest for CMCSF with oblique angle 30 , which is 8.83 C lower in comparison with CCMC for same Re. For the entire range of Re considered, the overall performance of all CMCSFs was found better than CCMC with maximum performance factor of 1.62 being achieved with secondary channel orientation of 24 .

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“…A Nu improvement of 39% was obtained with the newly introduced design of wavy channels when compared to SWMCs. Further, 13 parametric analysis was carried out for CWMCs by varying the aspect ratios, wave amplitudes, and wavelengths to compare thermal performance with SWMCs. The results revealed that microchannels with lesser wavelength, higher wave amplitude, and lower aspect ratio yield better thermal performance.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer augmentation in a radial curved microchannel

Mamidi

Balasubramanian

Kupireddi

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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Rapid advancement toward miniaturization has emerged with confront for superior heat dissipation techniques. Of all the available cooling systems, microchannel-based cooling systems stand out to provide better cooling performance through superior heat removal abilities. In the present study, the cooling performance and hydraulic flow characteristics of a radial curved microchannel with three curvature ratios were numerically investigated and compared with a radial straight microchannel. Unlike the conventional straight microchannels, curved channels possess better fluid mixing as a result of the centrifugal force caused due to curvature. This phenomenon has a significant effect on heat transfer and fluid flow characteristics. Work on radial curved microchannels has been scarce and there is a lot of potential to augment the heat transfer with lower pumping power particularly with a central inlet. A three-dimensional conjugate heat transfer analysis was carried out for three radial curved microchannels and a radial straight microchannel using the ANSYS Fluent commercial software with the Reynolds number range of 125–275. The results showed a Nusselt number increment of 36.38% for radial curved microchannels when compared to the radial straight microchannel. Further, the lowest average wall temperature was noted for the radial curved microchannel with a curvature ratio of 0.17 which was 15.63 °C lower when compared to that in a radial straight microchannel for the same Reynolds number. Contours of velocity and temperature are presented at various locations along the stream to aid the results. The overall performance of all three radial curved microchannels was found to be higher than that of the radial straight microchannel in the Reynolds number range considered, out of which the maximum performance factor of 1.245 was obtained for the radial curved microchannel with a curvature ratio of 0.17 as compared to the radial straight microchannel.

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Numerical study on significance of wave amplitude, wavelength and aspect ratio on heat transfer and fluid flow characteristics in circular wavy MC heat sink design

Cited by 3 publications

References 33 publications

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

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

Influence of secondary flow channels on heat transfer and fluid flow characteristics in curved microchannel

Heat transfer augmentation in a radial curved microchannel

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