Experimental study on influences of cylindrical grooves on thermal efficiency, exergy efficiency and entropy generation of CPU cooled by nanofluids

Zhao, Ning; Qi, Cong; Chen, Tiantian; Tang, Jinghua; Cui, Xin

doi:10.1016/j.ijheatmasstransfer.2019.01.106

Cited by 75 publications

(22 citation statements)

References 57 publications

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“…Sedimentation is the first issue of nanofluids, which can be overcome by improving the stability of nanofluids in the future of design and practical applications. An increase in the viscosity of the nanofluids compared with the base fluids is the second challenge . It means more pumping power should be required to overcome the pressure drop along a system for carrying nanofluids, which is interesting for the aim of the present study.…”

Section: Introductionmentioning

confidence: 99%

“…The top exergy efficiency was detected at 0.1 vol% TiO 2 ‐water with low Reynolds number. The effect of tubular grooves on the thermal and exergy efficiencies of mini HSs were assessed by Zhao et al using TiO 2 ‐water nanofluids (0.1‐0.5 vol%). The findings indicated that exergy efficiency strengthened with groove for the same pumping power and flow rate.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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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Section: Introductionmentioning

confidence: 99%

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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“…In some studies related to nanofluid cooling of CPU, the temperature of CPU is reduced to enhance its performance by using various types of bulges and grooves. The bulges and grooves of different shapes in aligned and staggered arrangements show a positive outcome for CPU cooling . Thus, the same idea can be employed in the PV module to lower its temperature and enhance its performance.…”

Section: Literature Review On the Cooling Of Pv Module With Nanofluidsmentioning

confidence: 99%

Performance enhancement of photovoltaic modules by nanofluid cooling: A comprehensive review

2020

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Summary Only 15‐20% of solar radiation incident on the photovoltaic (PV) cells is utilized which further reduces due to the rise in the temperature of the PV module and it also degrades the lifespan of the PV module. Therefore, numerous attempts were made to reduce this rising temperature of the PV module and different cooling techniques were employed. Nanofluid cooling is one of the potential cooling techniques for lowering the temperature of the PV module and augmenting the heat transfer by increasing the thermal conductivity of the nanofluid relative to the base fluid (BF). The experimental and numerical studies related to the cooling of PV cells with nanofluids have been reviewed. It was found that the heat transfer from the back of the PV module is enhanced with the augmentation in the concentration of nanoparticle in BF; however, some studies also demonstrate that the enhancement in the heat transfer also depends upon other factors such as the geometry at the rear of the PV module, nanoparticle material, nanoparticle size, BF, ambient conditions, etc. This review article also demonstrates the various issues with nanofluids such as instability, technological difficulties, high system costs, and the impossibility of finding a viable operational design which creates a barrier in the commercialization of the nanofluid cooling technique for PV modules.

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“…The heat transfer mediums used in photothermal conversion have been replaced by nanofluids recently. [10][11][12][13] Natural convection of nanofluids is one of the most important research topics. 7 Ag@TiO 2 nanoparticles were used to absorb the sunlight selectively.…”

Section: Introductionmentioning

confidence: 99%

“…9 The combination of nanofluids with different intensified structures could be used for CPU cooling as well. [10][11][12][13] Natural convection of nanofluids is one of the most important research topics. The simulation of natural convection becomes an advantageous mathematical method with the improvement of computer performance.…”

Section: Introductionmentioning

confidence: 99%

Influence of rotation angle of a triangular tube with a built‐in twisted tape on the thermal‐exergy efficiency and entropy generation of nanofluids in the heat exchange system

Zhao

et al. 2020

Asia-Pacific J Chem Eng

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In order to investigate the thermal-exergy efficiency and entropy generation of nanofluids flowing through a triangular tube with a built-in twisted tape, a heat exchange system is designed and established. Deionized water and three mass concentration nanofluids (ω = 0.1 wt%, 0.3 wt%, and 0.5 wt%) are applied as the heat-transfer mediums flowing through three different rotation angle (α = 0 , 30 , and 60 ) triangular tubes, respectively.Thermal efficiency index (η) and entropy generation (S) are used to characterize the performance of the heat exchange system. It is proved that the increase of nanoparticles can not only effectively promote the heat transfer effect but also augment the pressure loss. Nusselt number of nanofluids is increased by 20.2% on average, whereas the flow resistance coefficient is increased by 10.1% on average. Based on the thermal efficiency index, the data demonstrate that ω = 0.5 wt% nanofluids in the triangular tube at α = 0 can make the most effective use of energy, whose value could reach 1.32 at most. Exergy efficiency of nanofluids in the heat exchange system can be evidently heightened under the same pumping power and flow rate. Entropy production of 0.1 wt% nanofluids is the smallest. K E Y W O R D Snanofluids, forced convection, exergy efficiency, entropy generation

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Experimental study on influences of cylindrical grooves on thermal efficiency, exergy efficiency and entropy generation of CPU cooled by nanofluids

Cited by 75 publications

References 57 publications

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

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

Performance enhancement of photovoltaic modules by nanofluid cooling: A comprehensive review

Influence of rotation angle of a triangular tube with a built‐in twisted tape on the thermal‐exergy efficiency and entropy generation of nanofluids in the heat exchange system

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