Analysis of entropy generation and convective heat transfer of Al2O3 nanofluid flow in a tangential micro heat sink

Shalchi-Tabrizi, Amir; Seyf, Hamid Reza

doi:10.1016/j.ijheatmasstransfer.2012.04.005

Cited by 89 publications

(22 citation statements)

References 17 publications

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“…In other research lines, some authors analysed the use of nanofluids in microtubes with tangential impingement [14,15]. The results showed an improvement of both the temperature uniformity and the heat transfer, but with a slightly higher cost in terms of pressure drop.…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

Stepwise varying width microchannel cooling device for uniform wall temperature: Experimental and numerical study

Riera

Barrau

Omri

et al. 2015

Applied Thermal Engineering

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Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

Stepwise varying width microchannel cooling device for uniform wall temperature: Experimental and numerical study

Riera

Barrau

Omri

et al. 2015

Applied Thermal Engineering

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“…When heat transfer irreversibility is dominant, the suspension of nanoparticles decreases the entropy generation of the flow [15,16]. Numerous studies have reported the advantages of using nanofluid in term of exergetic effectiveness [17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Viscous Dissipation Effect on Streamwise Entropy Generation of Nanofluid Flow in Microchannel Heat Sinks

Ting

Hung

Guo

2016

Journal of Energy Resources Technology

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The effects of viscous dissipation on the entropy generation of water-alumina nanofluid convection in circular microchannels subjected to exponential wall heat flux are investigated. Closed-form solutions of the temperature distributions in the streamwise direction are obtained for the models with and without viscous dissipation term in the energy equation. The two models are compared by analyzing their relative deviations in entropy generation for different Reynolds numbers and nanoparticle volume fractions. The incorporation of viscous dissipation prominently affects the temperature distribution and consequently the entropy generation. When the viscous dissipation effect is neglected, the total entropy generation and the fluid friction irreversibility are nearly twofold overrated while the heat transfer irreversibility is underestimated significantly. By considering the viscous dissipation effect, the exergetic effectiveness for forced convection of nanofluid in microchannels attenuates with the increasing nanoparticle volume fraction and nanoparticle diameter. The increase in the entropy generation of nanofluid is mainly attributed to the intensification of fluid friction irreversibility. From the aspect of the second-law of thermodynamics, the widespread conjecture that nanofluids possess advantage over pure fluid associated with higher overall effectiveness is invalidated.

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“…Mohammed et al [13] conducted the combined effect of rib-groove and nanofluids on thermal and hydrodynamic characteristics in the channel. Shalchi-Tabrizi and Seyf [14] investigated the effect of volume fractions and particle diameters on entropy generation and thermal performance in a tangential micro heat sink. Zirakzadeh et al [15] experimentally investigated the characteristics of Al 2 O 3 nanofluids through a novel heat sink.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer enhancement of Al2O3-H2O nanofluids flowing through a micro heat sink with complex structure

Zhai

Xia

Liu

et al. 2015

International Communications in Heat and Mass Transfer

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Analysis of entropy generation and convective heat transfer of Al2O3 nanofluid flow in a tangential micro heat sink

Cited by 89 publications

References 17 publications

Stepwise varying width microchannel cooling device for uniform wall temperature: Experimental and numerical study

Stepwise varying width microchannel cooling device for uniform wall temperature: Experimental and numerical study

Viscous Dissipation Effect on Streamwise Entropy Generation of Nanofluid Flow in Microchannel Heat Sinks

Heat transfer enhancement of Al2O3-H2O nanofluids flowing through a micro heat sink with complex structure

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