Numerical Investigation of Heat Transfer Characteristics of a Novel Wavy-Tapered Microchannel Heat Sink

Eltaweel, Ahmed; Baobeid, Abdulla; Tompkins, Brian; Hassan, Ibrahim

doi:10.1115/ht2016-7432

Cited by 4 publications

(2 citation statements)

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“…Numerical investigations were carried out by Gong et al (2011) using two different wavy microchannels (Serpentine and Racoon) for Reynolds numbers in the range of 50 to 150 and predicted improved heat transfer performance in serpentine channels with a small increase in pressure drop. A novel wavy channel of tapering configuration with alternating coolant flow for different aspect ratios were numerically studied by Eltaweel et al (2016). Because of the strong dependency on aspect ratio, thermal resistance was reduced by 15%.…”

Section: Introductionmentioning

confidence: 99%

Thermal performance improvement in wavy microchannels using secondary channels

Paramanandam,

Srinivasan

et al. 2024

HFF

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Purpose This study aims to minimize the pressure drop across wavy microchannels using secondary branches without compromising its capacity to transfer the heat. The impact of secondary flows on the pressure drop and heat transfer capabilities at different Reynolds numbers are investigated numerically for different wavy microchannels. Finally, different channels are evaluated using performance evaluation criteria to determine their effectiveness. Design/methodology/approach To investigate the flow and heat transfer capabilities in wavy microchannels having secondary branches, a 3D conjugate heat transfer model based on finite volume method is used. In conventional wavy microchannel, secondary branches are introduced at crest and trough locations. For the numerical simulation, a single symmetrical channel is used to minimize computational time and resources and the flow within the channels remains single-phase and laminar. Findings The findings indicate that the suggested secondary channels notably improve heat transfer and decrease pressure drop within the channels. At lower flow rates, the secondary channels demonstrate superior performance in terms of heat transfer. However, the performance declines as the flow rate increased. With the same amplitude and wavelength, the introduction of secondary channels reduces the pressure drop compared with conventional wavy channels. Due to the presence of secondary channels, the flow splits from the main channel, and part of the core flow gets diverted into the secondary channel as the flow takes the path of minimum resistance. Due to this flow split, the core velocity is reduced. An increase in flow area helps in reducing pressure drop. Practical implications Many complex and intricate microchannels are proposed by the researchers to augment heat dissipation. There are challenges in the fabrication of microchannels, such as surface finish and achieving the required dimensions. However, due to the recent developments in metal additive manufacturing and microfabrication techniques, the complex shapes proposed in this paper are feasible to fabricate. Originality/value Wavy channels are widely used in heat transfer and micro-fluidics applications. The proposed wavy microchannels with secondary channels are different when compared to conventional wavy channels and can be used practically to solve thermal challenges. They help achieve a lower pressure drop in wavy microchannels without compromising heat transfer performance.

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Section: Introductionmentioning

confidence: 99%

Thermal performance improvement in wavy microchannels using secondary channels

Paramanandam,

Srinivasan

et al. 2024

HFF

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“…Machine vision of mass dispersion of gas in a liquid is important in many applications such as detection of air bubbles in dense dispersion [1] and air bubble segmentation in multiphase flow [2] and is characterised by multiple parameters such as volume, size and size distribution, number of bubbles and bubble velocity. Micro‐channel heat sinks with sinusoidal channel trajectories showed excellent thermal performance due to dean vortices [3, 4] and produce turbulence in the laminar flow with application in high end electronics requiring fast heat dissipation beyond the scope of conventional cooling techniques [5]. Recent advances in flow visualisations and image processing focus on detection and tracking of bubbles moving along vertical trajectories.…”

Section: Introductionmentioning

confidence: 99%

Detection and tracking of bubbles in two‐phase air water flow for non‐convergent sinusoidal channel

Ali

Sajid

Gillani

et al. 2019

IET Image Processing

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A Multivariable Numerical Investigation of Wavy-Based Microchannel Heat Sink Geometry Toward Optimal Thermal Performance

Eltaweel,

Hassan

2024

Journal of Thermal Science and Engineering Applications

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This research provides a comprehensive multivariable comparative investigation of the effect of various microchannel configurations on their thermal performance. Three-dimensional fluid flow and heat transfer simulations are performed with different arrangements of the channel's width tapering and cross-sectional aspect ratio with an emphasis on the synergistic proven effects of geometrical parameters in innovatory combinations. Results confirm that wavy channels are significantly superior to straight channels in terms of thermal performance due to the creation of secondary flow (Dean Vortices), which improves the processes of advective mixing and, therefore, overall heat transfer characteristics with minimal pumping power penalty. Width-tapering of wavy channels also shows better thermal resistance than untapered wavy channels producing almost 10 percent thermal resistance improvement. The study indicates a significant dependency of thermal performance on the cross-sectional aspect ratio of the channel which suggests that there are ideal tapering and aspect ratio conditions. An innovative wavy-tapered microchannel heat sink has been introduced, featuring an optimal parametric configuration and directionally alternating coolant flow. This design results in additional thermal resistance improvement by 15% and significantly improves substrate temperature distribution uniformity. Overall, the results demonstrate the superior potential of the configuration for high-end electronics cooling tasks. These results provide interpretive insight into microchannel heat sink design and optimization.

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Numerical Investigation of Heat Transfer Characteristics of a Novel Wavy-Tapered Microchannel Heat Sink

Cited by 4 publications

References 0 publications

Thermal performance improvement in wavy microchannels using secondary channels

Thermal performance improvement in wavy microchannels using secondary channels

Detection and tracking of bubbles in two‐phase air water flow for non‐convergent sinusoidal channel

A Multivariable Numerical Investigation of Wavy-Based Microchannel Heat Sink Geometry Toward Optimal Thermal Performance

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