Analysis of Interrupted Rectangular Microchannel Heat Sink with High Aspect Ratio

Kamal, Harshin; Dewan, Anupam

doi:10.18869/acadpub.jafm.73.238.26366

Cited by 9 publications

(3 citation statements)

References 22 publications

(24 reference statements)

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“…The present simulated results were found to be in excellent agreement with the reported results in the literature for developing flow by Dewan and Kamal [39].…”

Section: Resultssupporting

confidence: 90%

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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“…The present simulated results were found to be in excellent agreement with the reported results in the literature for developing flow by Dewan and Kamal [39].…”

Section: Resultssupporting

confidence: 90%

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

Srivastava¹,

Dewan²,

Bajpai³

2017

IJHT

Self Cite

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“…The shape of the micro-channels and their configuration may largely affect the cooling performance [ 10 , 11 ]. In terms of the micro-channel aspect ratio and inner surface roughness, higher aspect ratio and larger surface roughness are both preferable for heat dissipation [ 12 , 13 ]. In order to study the effects of disturbance in the micro-channels, researchers build turbulent micro structures in the micro-channel, which improve the heat exchange efficiency and realize the consistency of flow rate [ 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

A Comprehensive Study of a Micro-Channel Heat Sink Using Integrated Thin-Film Temperature Sensors

Wang

et al. 2018

Sensors

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A micro-channel heat sink is a promising cooling method for high power integrated circuits (IC). However, the understanding of such a micro-channel device is not sufficient, because the tools for studying it are very limited. The details inside the micro-channels are not readily available. In this letter, a micro-channel heat sink is comprehensively studied using the integrated temperature sensors. The highly sensitive thin film temperature sensors can accurately monitor the temperature change in the micro-channel in real time. The outstanding heat dissipation performance of the micro-channel heat sink is proven in terms of maximum temperature, cooling speed and heat resistance. The temperature profile along the micro-channel is extracted, and even small temperature perturbations can be detected. The heat source formed temperature peak shifts towards the flow direction with the increasing flow rate. However, the temperature non-uniformity is independent of flow rate, but solely dependent on the heating power. Specific designs for minimizing the temperature non-uniformity are necessary. In addition, the experimental results from the integrated temperature sensors match the simulation results well. This can be used to directly verify the modeling results, helping to build a convincing simulation model. The integrated sensor could be a powerful tool for studying the micro-channel based heat sink.

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“…Dewan and Kamal [4] investigated the effect of aspect ratio on heat transfer characteristics in an interrupted microchannel. Xie et al [5] investigated the effects of different geometrical parameters of channel, such as, overall thickness, substrate thickness, and flow rate on heat transfer characteristics using the standard k-ε model.…”

Section: Introductionmentioning

confidence: 99%

A study of turbulent heat transfer in convergent-divergent shaped microchannel with ribs and cavities using CFD

Srivastava¹,

Dewan²

2020

JMES

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This paper presents the effects of microchannel shape with ribs and cavities on turbulent heat transfer. Three-dimensional conjugate heat transfer using the SST k-ω turbulence model has been investigated for four different microchannels, namely, rectangular, rectangular with ribs and cavities, convergent-divergent (CD) and convergent-divergent with Ribs and Cavities (CD-RC). The flow field, pressure and temperature distributions and friction factor are analyzed, and thermal resistance and average Nusselt number are compared. The thermal performance of the CD-RC microchannel is found to be better than that of other microchannels considered in terms of an average Nusselt number increased from 16% to 40%. Heat transfer increases due to a strong fluid mixing and periodic interruption of boundary-layer. It is observed that with an increase in Reynolds number (Re), the thermal resitance drops rapidly. The thermal resistance of the CD-RC microchannel is decreased by 30% than that of the rectangular microchannel for Re ranging from 2500 to 7000. However, such design of microchannel loses its heat transfer effectiveness due to a high pumping power at high values of Re.

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Analysis of Interrupted Rectangular Microchannel Heat Sink with High Aspect Ratio

Cited by 9 publications

References 22 publications

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

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

A Comprehensive Study of a Micro-Channel Heat Sink Using Integrated Thin-Film Temperature Sensors

A study of turbulent heat transfer in convergent-divergent shaped microchannel with ribs and cavities using CFD

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