Three dimensional numerical analyses and optimization of offset strip-fin microchannel heat sinks

Hong, Fangjun; Cheng, Ping

doi:10.1016/j.icheatmasstransfer.2009.02.015

Cited by 123 publications

(53 citation statements)

References 12 publications

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“…To carry out a 3-D analysis of interrupted microchannel heat sink, several studies ignored the multichannel effect and simulated only the repeating geometry of microchannels (Wong and Lee, 2015;and Hong and Cheng, 2009). A 2-D analysis provides the flexibility to analyze in detail the consequences of multichannel effect.…”

Section: Multi-channel Effectmentioning

confidence: 99%

“…Their results showed that the offset ribs result in significant heat transfer enhancement at the cost of a higher pressure drop. Hong and Cheng (2009) presented a threedimensional numerical study on laminar, forced convection of water in offset strip-fin microchannels network heat sinks for microelectronic cooling. The heat transfer and fluid flow characteristics in offset strip-fin microchannels heat sinks were analyzed and the heat transfer enhancement mechanism, effects of geometric size of strip-fin on the heat sink performance were investigated.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Interrupted Rectangular Microchannel Heat Sink with High Aspect Ratio

Kamal

Dewan

2017

JAFM

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A computational modelling of microchannel heat sinks with high aspect ratio has been performed to compare the geometrical features in the plane parallel to the heating surface and to determine the optimum configuration for the best heat transfer characteristics. A periodic thermal development of flow can cause significant heat transfer enhancement. A consensus on a particular geometrical configuration that provides the best heat transfer characteristics has not been reached in the literature, although many novel ideas have been proposed recently. Firstly the validity and applicability of microchannel sink modelling is presented followed by an optimization of parameters of interrupted microchannel heat sink. Consequences of the multichannel effect due to the introduction of transverse microchamber are also presented. It has been shown that the average Nusselt number of the microchannel heat sink increases by the introduction of a transverse microchamber with the additional advantage of a lower pressure drop. There exists an optimum width for the transverse microchamber for which the interrupted microchannel heat sink shows optimum characteristics.

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Section: Multi-channel Effectmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of Interrupted Rectangular Microchannel Heat Sink with High Aspect Ratio

Kamal

Dewan

2017

JAFM

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“…Using a coarse arrangement of strip fins with AR=5.3, the pressure drop in their experiments was substantially lower than for a denser arrangement of pins but with a similar thermal resistance. Hong and Cheng [24] studied the performance of strip fins in staggered arrangements in a micro-channel heat sink. They varied fin's length and the spaces between fins to find the optimal design.…”

Section: Introductionmentioning

confidence: 99%

A numerical investigation of thermal airflows over strip fin heat sinks

Al-Sallami

Al‐damook

Thompson

2016

International Communications in Heat and Mass Transfer

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The benefits of using strip fin heat sinks (SFHSs) where the cross-sectional aspect ratio of the fins lie between those for plate fins (high aspect ratio) and pins fins (aspect ratio ) are explored computationally, using a conjugate heat transfer model. Results show that strip fins provide another effective means of enhancing heat transfer, especially when staggered arrangements of strip fins are used. A detailed parameter investigation demonstrates that perforating the strip fins provide additional improvements in terms of enhanced heat transfer, together with reduced pressure loss and heat sink mass. Results are also given which show that, for practical applications in micro-electronics cooling, perforated SFHSs offer important benefits as a means of achieving smaller processor temperatures for reduced mechanical power consumption.

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“…Foong et al [22] used four longitudinal internal fins and analysed optimum fin height for heat transfer augmentation. Effects of geometric size of strip-fin were investigated by Hong et al [23]. They concluded that an optimal design of strip-fin size could reduce the pressure drop with maximum wall temperature.…”

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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Three dimensional numerical analyses and optimization of offset strip-fin microchannel heat sinks

Cited by 123 publications

References 12 publications

Analysis of Interrupted Rectangular Microchannel Heat Sink with High Aspect Ratio

Analysis of Interrupted Rectangular Microchannel Heat Sink with High Aspect Ratio

A numerical investigation of thermal airflows over strip fin heat sinks

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

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