Numerical investigation of heat transfer enhancement and fluid flow characteristics in a microchannel heat sink with different wall/design configurations of protrusions/dimples

Rehman, M. Mohib Ur; Cheema, Taqi Ahmad; Ahmad, Faraz; Abbas, Ahmad; Malik, Muhammad Sohail

doi:10.1007/s00231-019-02697-9

Cited by 32 publications

(10 citation statements)

References 30 publications

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“…They revealed that flow separation occurs earlier in the case of dimples, so the wake flow is more intense in that case as com-pared to the pin fin case. Similarly, Rehman et al 15 investigated numerically the heat transfer and fluid flow behavior of microchannel heat sink by applying protrusions and dimples at different walls of the channel. They analyzed different designs, walls, and geometric configurations of these protrusions and dimples to optimize the performance 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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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

Self Cite

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“…Prolonged heat flux causes a hot spot on electrical gadgets and lowers their lifetime [2]. Thermal management of such high power density and compact electronics is very crucial to improve their safety, operational life, efficiency, and performance through advance and robust cooling techniques [3,4]. Due to rise in power density and size miniaturization of electronic devices, traditional cooling methods have become inefficient.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, heat transfer was enhanced due to periodic interruption and redevelopment of thermal and hydraulic boundary layers. Rehman et al [3] numerically investigated the hydrothermal performance of MCHS with different configurations of protrusions and dimples. With the addition of protrusions/ dimples to different walls, the fluid flow pattern was enhanced, resulting in better fluid intermixing and lower pumping power augmentation to transfer the same heat load as smooth micro channel.…”

Section: Introductionmentioning

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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“…4B, pp. 3641-3651 [9,10], channel curvature [11,12], dimples and protrusions [13,14], ribs [15][16][17][18], and grooves [19][20][21][22][23][24][25]. Among these innovative designs, the micro-channel with ribs can generate a significant thermal enhancement due to the strengthened flow disturbance in channels [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Effects of geometric parameters on fluid-flow and heat transfer in micro-channel heat sink with trapezoidal grooves in sidewalls

Zhu

et al. 2022

THERM SCI

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Trapezoidal grooves were arranged in channel sidewalls of the proposed microchannel heat sinks to enhance heat transfer for cooling microelectronic systems. Three-dimensional numerical simulations were carried out to investigate the characteristics of fluid flow and heat transfer in the proposed microchannels. Field structures of thermal fluid flow, Nusselt number (Nu) and friction factor (f) were employed to study the effects of the relative groove depth (?) and relative grooves spacing length (?) of trapezoidal grooves on the thermal and hydraulic performance of the proposed microchannels. The results showed that the proposed microchannel presented better flow and thermal performance than the smooth straight one for Re <597.74 with f/f0<1 and for Re >149.44 with Nu/Nu0>1, respectively. The thermal enhancement factor (?) was achieved up to 1.197 with ?=0.4 and ?=1 for Re=714.18. Furthermore, the relative groove depth had much more significant influence on the overall performance than the relative groove spacing length.

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Numerical investigation of heat transfer enhancement and fluid flow characteristics in a microchannel heat sink with different wall/design configurations of protrusions/dimples

Cited by 32 publications

References 30 publications

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

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

Effects of geometric parameters on fluid-flow and heat transfer in micro-channel heat sink with trapezoidal grooves in sidewalls

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