Performance Analysis of a Microchannel Heat Sink with Various Rib Configurations

Khan, Aatif Ali; Kim, Sunmin; Kim, Kwang‐Yong

doi:10.2514/1.t4663

Cited by 31 publications

(19 citation statements)

References 31 publications

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“…Ribs mounted in the microchannel heat sink generally result in a higher heat transfer coefficient but are usually accompanied by a higher pressure drop per unit length. Khan et al [ 22 ] presented an analysis of microchannel heat sinks with ribbed channels in various configurations using the three-dimensional Navier–Stokes equations and compared them to smooth channels in a Reynolds number range of 100–500. Their results indicated that the thermal resistance of microchannels was greatly reduced by introducing ribs, and the pressure drop was increased greatly because of the ribs.…”

Section: Literature Reviewmentioning

confidence: 99%

“…Copper heat sinks with integrated microchannels are expected to dominate heat sink applications to handle high heat removal rates. These practical advantages of microchannel heat sinks have stimulated experimental, theoretical, and numerical research [ 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ]. The use of microchannel heat sinks is becoming more common in various industrial applications.…”

Section: Introductionmentioning

confidence: 99%

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Pressure Drop of Microchannel Plate Fin Heat Sinks

Duan

et al. 2019

Micromachines

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The entrance region constitutes a considerable fraction of the channel length in miniaturized devices. Laminar slip flow in microchannel plate fin heat sinks under hydrodynamically developing conditions is investigated semi-analytically and numerically in this paper. The semi-analytical model for the pressure drop of microchannel plate fin heat sinks is obtained by solving the momentum equation with the first-order velocity slip boundary conditions at the channel walls. The simple pressure drop model utilizes fundamental solutions from fluid dynamics to predict its constitutive components. The accuracy of the model is examined using computational fluid dynamics (CFD) simulations and the experimental and numerical data available in the literature. The model can be applied to either apparent liquid slip over hydrophobic and superhydrophobic surfaces or gas slip flow in microchannel heat sinks. The developed model has an accuracy of 92 percent for slip flow in microchannel plate fin heat sinks. The developed model may be used to predict the pressure drop of slip flow in microchannel plate fin heat sinks for minimizing the effort and expense of experiments, especially in the design and optimization of microchannel plate fin heat sinks.

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Section: Literature Reviewmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Pressure Drop of Microchannel Plate Fin Heat Sinks

Duan

et al. 2019

Micromachines

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“…high thermal conductivity solid materials [7] or nanofluids [8,9]; or novel designs, e.g., inserting solid ribs, porous blocks or baffles into the channel [10][11][12][13][14][15], or using wavy channels [16][17][18][19][20]. Among these designs, the outcome of lower thermal resistance usually accompanies with the penalty of high pressure drop, which is still an obstacle to the practical applications.…”

Section: Introductionmentioning

confidence: 97%

A new scheme for reducing pressure drop and thermal resistance simultaneously in microchannel heat sinks with wavy porous fins

Zhao

Lin

et al. 2017

International Journal of Heat and Mass Transfer

121

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“…Ribs mounted in MCHS generally result in a heat transfer enhancement [ 49 ]. Khan et al [ 50 ] conducted a three-dimensional numerical simulation of MCHS with ribbed channels in various configurations. Chai et al [ 51 ] carried out a numerical analysis of the thermal performance of an interrupted microchannel heat sink with ribs in the transverse microchambers.…”

Section: Introductionmentioning

confidence: 99%

Fluid Flow and Entropy Generation Analysis of Al2O3–Water Nanofluid in Microchannel Plate Fin Heat Sinks

Duan

et al. 2019

Entropy

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The flow in channels of microdevices is usually in the developing regime. Three-dimensional laminar flow characteristics of a nanofluid in microchannel plate fin heat sinks are investigated numerically in this paper. Deionized water and Al2O3–water nanofluid are employed as the cooling fluid in our work. The effects of the Reynolds number (100 < Re < 1000), channel aspect ratio (0 < ε < 1), and nanoparticle volume fraction (0.5% < Φ < 5%) on pressure drop and entropy generation in microchannel plate fin heat sinks are examined in detail. Herein, the general expression of the entropy generation rate considering entrance effects is developed. The results revealed that the frictional entropy generation and pressure drop increase as nanoparticle volume fraction and Reynolds number increase, while decrease as the channel aspect ratio increases. When the nanoparticle volume fraction increases from 0 to 3% at Re = 500, the pressure drop of microchannel plate fin heat sinks with ε = 0.5 increases by 9%. It is demonstrated that the effect of the entrance region is crucial for evaluating the performance of microchannel plate fin heat sinks. The study may shed some light on the design and optimization of microchannel heat sinks.

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Performance Analysis of a Microchannel Heat Sink with Various Rib Configurations

Cited by 31 publications

References 31 publications

Pressure Drop of Microchannel Plate Fin Heat Sinks

Pressure Drop of Microchannel Plate Fin Heat Sinks

A new scheme for reducing pressure drop and thermal resistance simultaneously in microchannel heat sinks with wavy porous fins

Fluid Flow and Entropy Generation Analysis of Al2O3–Water Nanofluid in Microchannel Plate Fin Heat Sinks

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