Thermodynamic Assessment of Microchannel Heat Sinks with Novel Sidewall Ribs

Rehman, M. Mohib Ur; Cheema, Taqi Ahmad; Ahmad, Faraz; Khan, M. Adam; Abbas, Ahmad

doi:10.2514/1.t5770

Cited by 34 publications

(10 citation statements)

References 31 publications

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“…In subsequent studies, researchers have investigated more different shapes of ribs in terms of enhanced heat transfer properties. Rehman et al [41,42] carried out a numerical study of the heat transfer and hydraulic characteristics of elliptical, trapezoidal, hydrofoil-shaped and rectangular ribbed microchannels. The addition of sidewall ribs improves the heat transfer performance, among which the hydrofoil-shaped rib microchannel has the best heat transfer performance and its pressure drop is the lowest among all sidewall rib microchannels.…”

Section: Sidewall Rib Structurementioning

confidence: 99%

Topological structures for microchannel heat sink applications – a review

Wang

et al. 2023

Manufacturing Rev.

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The microchannel heat sink (MCHS) has the advantages of small heat transfer resistance, high heat transfer efficiency and small size, which exhibits good heat transfer performance in the field of active heat dissipation of electronic devices integrated with high heat flux density. In this paper, the application of MCHS in thermal management is reviewed in recent years, and the research progress of microchannel topology on enhancing heat transfer performance is summarized. Firstly, the research progress on the cross-sectional shape of the microchannel shows that the heat transfer area and fluid flow dead zone of the microchannel is the keys to affecting the heat transfer performance; Secondly, the microchannel distribution and the bionic microchannel structure have a great role in enhancing heat transfer performance, especially in microchannel temperature uniformity; Thirdly, the disturbing effect caused by interrupted structures in microchannels such as ribs and concave cavities has become a hot topic of research because it can weaken the thermal boundary layer and increase heat dissipation. Finally, the commonly used MCHS materials and cooling media are summarized and introduced. Based on the above reviews of MCHS research and applications, the future trends of MCHS topologies are presented.

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Section: Sidewall Rib Structurementioning

confidence: 99%

Topological structures for microchannel heat sink applications – a review

Wang

et al. 2023

Manufacturing Rev.

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“…Rehman et al 26 investigated the effect of novel sidewall ribs on the thermal and hydraulic performance of MCHS. In their study, the cross-sections of novel ribs included hydrofoil, trapezoid, ellipse, and rectangular ribs which were installed at side-walls of MCHS.…”

Section: Introductionmentioning

confidence: 99%

Performance improvement and thermodynamic assessment of microchannel heat sink with different types of ribs and cones

Zhang

Ahmad

Khan

et al. 2022

Sci Rep

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The present study aims to investigate the performance of microchannel heat sink via numerical simulations, based on the first and second law of thermodynamics. The heat transfer and flow characteristics of rectangular microchannel heat sinks have been improved by adding six different types of surface enhancers. The cross-sections include rectangular, triangular, and hexagonal-shaped ribs and cones. The cones have been created from the same cross-sections of ribs by drafting them at an angle of 45° orthogonal to the base, which is expected to decrease the pressure drop, dramatically. The performance of ribs and cones has been evaluated using different parameters such as friction factor, wall shear stress, entropy generation rate, augmentation entropy generation number, thermal resistance, and transport efficiency of thermal energy. The results of the present study revealed that the novel effect of coning at an angle of 45° reduces frictional losses (Maximum pressure drop reduced is 85%), however; a compromise on thermal behavior has been shown (Maximum Nusselt number reduced is 25%). Similarly, the application of coning has caused a significant reduction in wall shear stress and friction factor which can lead to reducing the pumping power requirements. Moreover, triangular ribs have more ability to transfer thermal energy than rectangular and hexagonal ribs. Furthermore, it has been examined in the present study that the trend of total entropy generation rate for triangular ribs decreases up to Re = 400 and then increases onwards which means that thermal losses are more significant than frictional losses at lower Reynolds number. However, frictional losses dominate over thermal losses at higher Reynolds numbers, where vortex generation takes place, especially in triangular ribs.

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“…In terms of thermal performance, elliptical ribs performed better, whereas hydrofoil ribs performed better in terms of hydrodynamic performance. Rehman et al [13] performed numerical simulations to investigate the effect of different side wall rib configurations on thermal-hydraulic characteristics of MCHS. Addition of ribs on side wall increased the pressure drop along with significant enhancement of thermal performance.…”

Section: Introductionmentioning

confidence: 99%

“…𝑢 = 𝑣 = 𝑤 = 0 The normal coordinate to the channel's walls is represented by "n ".D. Data reductionThe Reynolds number is defined as: 𝑅𝑒 = 𝜌 𝑓 𝑢 𝑚 𝐷 ℎ µ 𝑓(13) 𝒖 𝒎 is average or mean velocity of fluid and 𝝁 𝒇 is dynamic viscosity of fluid. 𝐷 ℎ = 2𝐻 𝑐 𝑊 𝑐 𝐻 𝑐 +𝑊 𝑐(14)…”

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confidence: 99%

Computational Study of Hydrothermal Performance of Microchannel Heat Sink With Trefoil Shape Ribs

et al. 2022

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Traditional cooling technologies are now become inadequate for electronic chips cooling due to size reduction and increase in generated heat flux. Microchannel heat sink (MCHS) is promising candidate due to its superior cooling performance than its competitors. The aim of this study is to investigate the hydrothermal performance of MCHS with novel trefoil shape ribs. The three configurations of trefoil shape ribs are: MC-AWTR (all wall trefoil ribs), MC-SWTR (side wall trefoil ribs), and MC-BWTR (base wall trefoil ribs). The performance of microchannel is evaluated on the basis of thermal enhancement factor, thermal resistance, transport efficiency and entropy generation at Re=100-1000. The results predict that addition of trefoil ribs to walls of smooth microchannel significantly improve its thermal performance at cost of pressure penalty. Nusselt number and average heat transfer coefficient tends to increase with rise in Reynolds number while thermal resistance and entropy generation reduces. Highest pressure drop occurs for MC-AWTR configuration due to more obstruction of the fluid flow. MC-SWTR configuration has highest thermal enhancement factor among all configurations while MC-AWTR has lowest due to large pressure drop penalty at all Reynold number. So, overall MC-SWTR shows superior performance than any other considered trefoil rib configuration.

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Thermodynamic Assessment of Microchannel Heat Sinks with Novel Sidewall Ribs

Cited by 34 publications

References 31 publications

Topological structures for microchannel heat sink applications – a review

Topological structures for microchannel heat sink applications – a review

Performance improvement and thermodynamic assessment of microchannel heat sink with different types of ribs and cones

Computational Study of Hydrothermal Performance of Microchannel Heat Sink With Trefoil Shape Ribs

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