Numerical Simulation of Micro-Channel Heat Sink with Dimpled Surfaces

Gururatana, Suabsakul

doi:10.3844/ajassp.2012.399.404

Cited by 21 publications

(1 citation statement)

References 13 publications

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“…Gururatana [29] also showed that Nu could be enhanced using dimpled structure but it was found useful for Re more than 125. Liu et al [30] used different grooved microstructures and observed that Nu for V-grooved structure was 1.5 times more than that for other structures considered.…”

Section: Introductionmentioning

confidence: 99%

Flow and heat transfer characteristics in convergent-divergent shaped microchannel with ribs and cavities

Srivastava¹,

Dewan²,

Bajpai³

2017

IJHT

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A computational study has been carried out to examine the effects of ribs and cavities on flow and heat transfer in a convergent-divergent shaped microchannel heat sink with constant heat flux for Reynolds number (Re) ranging from 120 to 900. Three-dimensional governing equations were discretized using the finite-volume method. The computational domain included solid silicon and fluid regions. A significant amount of work has been reported in the literature on the individual effects of channel shape and flow disruption using obstacles on thermal performance of microchannels. In the present study convergent-divergent (CD) shaped microchannel with and without ribs and cavities (RC) are considered and their friction coefficient, thermal resistance and maximum substrate temperature are investigated in detail. The present results show that the usage of CD shape with ribs and cavities can reduce the overall thermal resistance up to 40% and make the bottom surface temperature quite uniform. This heat transfer enhancement is mainly due to interruption and redevelopment of boundary-layers along with recirculation zone. The results also show that increasing Re leads to an enhanced heat transfer in terms of increased averaged Nusselt number from 15% to 46%. The combined effect of CD shape with RC is quite effective in heat transfer augmentation but it gradually loses its effectiveness at large values of Re due to a high pressure drop penalty.

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Section: Introductionmentioning

confidence: 99%

Flow and heat transfer characteristics in convergent-divergent shaped microchannel with ribs and cavities

Srivastava¹,

Dewan²,

Bajpai³

2017

IJHT

View full text Add to dashboard Cite

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Heat transfer enhancement using elliptical fin microchannel

Peddigari

Kupireddi

Balasubramanian

et al. 2021

Asia-Pacific J Chem Eng

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Thermal performance and fluid flow characteristics of elliptical fin microchannel are numerically investigated by varying fin orientation in the laminar flow region. Six distinctly oriented elliptical fins ranging 0 -12 along channel length are numerically examined for inlet Reynolds number (Re) ranging 174-748. The same is compared with the conventional straight fin microchannel. It is found that continuous straight fin when replaced with a series of short length elliptical fins leads to re-establishment of the thermal boundary layer and results in thinning of boundary layer thickness. By varying the fin angle, fluid is directed from primary channel to secondary channel which finally flows into the primary channel. These secondary flows disrupt the boundary layer and show better fluid mixing in the channel. Among all the orientations considered, elliptical fin oriented at 2 yields better cooling performance ensuing an optimum average Nusselt number enhancement of 116% (7.68-16.64) with a very less pressure penalty (15%). Besides this, the rise in wall temperature is reduced by 25.39% in comparison to straight fin microchannel.

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