Exergy analysis and performance evaluation of flow and heat transfer in different micro heat sinks with complex structure

Zhai, Yuling; Xia, Guodong; Liu, Xianfei; Li, Y.F.

doi:10.1016/j.ijheatmasstransfer.2015.01.039

Cited by 98 publications

(22 citation statements)

References 31 publications

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“…Based on our previous work, we pointed out that for a certain velocity value, velocity or temperature gradient, the smaller synergy angle or higher field synergy number results in more effective heat transfer [20]. Therefore, the two parameters are important to evaluate heat transfer performance in double-layered microchannels.…”

Section: Data Reducationmentioning

confidence: 99%

Analysis of field synergy principle and the relationship between secondary flow and heat transfer in double-layered microchannels with cavities and ribs

Zhai

Wang

et al. 2016

International Journal of Heat and Mass Transfer

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Section: Data Reducationmentioning

confidence: 99%

Analysis of field synergy principle and the relationship between secondary flow and heat transfer in double-layered microchannels with cavities and ribs

Zhai

Wang

et al. 2016

International Journal of Heat and Mass Transfer

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“…The following studies performed different numerical investigations of the energy and exergy efficiencies. For instance, the efficiency of the second law (exergy) and thermal performance of six micro HSs, which include six different cavities and ribs, were evaluated by Zhai et al using pure water. They found that the drop in the temperature distribution led to a decline of the irreversibility and an increase in thermal energy performance.…”

Section: Introductionmentioning

confidence: 99%

Three‐dimensional computational comparison of mini‐pinned heat sinks using different nanofluids: Part two—energy and exergy characteristics

Al‐damook

Alfellag

Khalil

2019

Heat Trans. Asian Res.

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The energy and exergy characteristics of 3D-pinned heat sink (HS) designs have been computationally compared as the second part of a three-part investigation. Different pin profiles, such as circular, square, triangular, strip and elliptic pins, and without pin HS are conducted with three different types of nanofluids-Al 2 O 3 -water, SiO 2 -water, and CuO-water for laminar forced convection. The concentrations of nanofluids vary from 0 to 5 vol% with different Reynolds numbers ranging between 100 and 1000. The finite volume method employing the SIMPLE algorithm for a computational solution is applied to solve the Navier-Stokes and energy equations. Four criterions studies are explained-energy efficiency, exergy loss, and exergy efficiency of HSs with pressure drop. The results showed that the highest energy and exergy efficiencies are nearly 76% and 57%, respectively, for elliptic-pinned HSs using pure water, while about 82% and 62% using 5 vol% of SiO 2 -water nanofluids. Besides, the elliptic-pinned HSs have a favorable reduction in the exergy loss, nearly 17% using 5 vol% of SiO 2 -water nanofluids. Subsequently, the elliptic-pinned HS is recommended to apply with pure water considering the development in pressure drop required. However, the elliptic-pinned HSs could be employed with 5 vol% of SiO 2 -water nanofluids regardless of the development in pressure drop required for thermal energy dissipation applications with more exergy efficiency and reduction of exergy loss. K E Y W O R D Sdifferent nanofluids, different pinned heat sinks, energy and exergy characteristics, exergy loss, thermal energy enhancement

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“…Based on entropy generation analysis for rectangular, triangular, trapezoidal and fan-shaped ribs placed between fan-shaped cavities, Zhai et al [116] predicted superiority of trapezoidal and fan-shaped ribs respectively below and above Re of 300. Zhai et al [120] with triangular and fan-shaped cavities exhibited better performance for triangular cavity with trapezoidal rib for Re in the range of 100-300 and with triangular rib for 300\ Re\600. Ghani et al [121] considered microchannels with rectangular rib (MC-RR), secondary branches (MC-SOC), and both (MC-SOCRR).…”

Section: Authorsmentioning

confidence: 97%

A review of liquid flow and heat transfer in microchannels with emphasis to electronic cooling

2019

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Since the realization of microchannel devices more than three and half decades ago with water as the cooling fluid providing heat transfer enhancement, significant progress has been made to improve the cooling performance. Thermal management for electronic devices with their ever-widening user profile remains the major driving force for performance improvement in terms of miniaturisation, long-term reliability, and ease of maintenance. The ever-increasing requirement of meeting higher heat flux density in more compact and powerful electronic systems calls for further innovative solutions. Some recent studies indicate the promise offered by processes with phase change and the use of active devices. But their adoption for electronic cooling still weighs unfavourably against long-term fluid stability and simplicity of device profile with moderate to high heat transfer capability. Applications and reviews of these promising research trends have been briefly visited in this work. The main focus of this review is the flow and heat transfer regime related to electronic cooling in evolving channel forms, whose fabrication are being enabled by the significant advancement in micro-technologies. Use of disruptive wall structures like ribs, cavities, dimples, protrusions, secondary channels and other interrupts along with smooth-walled channels with curved flow passages remain the two chief geometrical innovations envisaged for these applications. These innovations target higher thermal enhancement factor since this implies more heat transfer capability for the same pumping power in comparison with the corresponding straight-axis, smooth-wall channel configuration. The sophistication necessary to deal with the experimental uncertainties associated with the micron-level characteristic length scale of any microchannel device delayed the availability of results that exhibited acceptable matching with numerical investigations. It is indeed encouraging that the experimental results pertaining to simple smooth channels to grooved, ribbed and curved microchannels without unreasonable increase in pumping power have shown good agreement with conventional numerical analyses based on laminar-flow conjugate heat-transfer model with no-slip boundary condition. The flow mechanism with the different disruptive structures like dimple, cavity and rib, fin and interruption, vortex generator, convergingdiverging side walls or curved axis are reviewed to augment the heat transfer. While the disruptions cause heat transfer enhancement by interrupting the boundary layer growth and promoting mixing by the shed vortices or secondary channel flow, the flow curvature brings in enhancement by the formation of secondary rolls culminating into chaotic advection at higher Reynolds number. Besides these revelations, the numerical studies helped in identifying the parameter ranges, promoting a particular enhancement mechanism. Also, the use of modern tools like Poincare section and the analysis of flow bifurcation leading to chaotic advection is discussed....

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Exergy analysis and performance evaluation of flow and heat transfer in different micro heat sinks with complex structure

Cited by 98 publications

References 31 publications

Analysis of field synergy principle and the relationship between secondary flow and heat transfer in double-layered microchannels with cavities and ribs

Analysis of field synergy principle and the relationship between secondary flow and heat transfer in double-layered microchannels with cavities and ribs

Three‐dimensional computational comparison of mini‐pinned heat sinks using different nanofluids: Part two—energy and exergy characteristics

A review of liquid flow and heat transfer in microchannels with emphasis to electronic cooling

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