Estimation of Entropy Generation for Ag-MgO/Water Hybrid Nanofluid Flow through Rectangular Minichannel by Using Artificial Neural Network

Uysal, Cüneyt; Korkmaz, Mehmet Erdi

doi:10.2339/politeknik.417756

Cited by 8 publications

(12 citation statements)

References 38 publications

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“…The incremental trend at high Re was also higher than the incremental trend at low Re. This tend of results gives a good agreement with the trend obtained 38,69 . At Re higher than 200, the highest values of Ṡ� gen,total were for the ternary hybrid nanofluid followed by the binary hybrid nanofluid and water.…”

Section: Frictional Entropy Generationsupporting

confidence: 90%

Thermohydraulic performance improvement and entropy generation characteristics of a microchannel heat sink cooled with new hybrid nanofluids containing ternary/binary hybrid nanocomposites

Souby

Bargal

Wang

2021

Energy Science & Engineering

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Recently, the combination of hybrid nanofluids with microchannel heat sinks (MCHSs) has led to superior heat removal from high heat flux electronics chips.The present work aimed to evaluate numerically the first and second law performances of MCHSs using the new cost-effective binary/ternary hybrid nanofluids. Water-based binary and ternary hybrid nanofluids include the MgO/ TiO 2 nanocomposite and the CuO/MgO/TiO 2 nanocomposite, respectively. The effects of the hybrid nanofluid volume concentration (vol.%) and Reynolds number (Re) on the heat transfer, pressure drop, combined thermohydraulic characteristics, and entropy generation characteristics of the MCHSs are discussed.The results show that higher values of the convective heat transfer coefficient, pressure drop, and frictional entropy generation rate are obtained when using hybrid nanofluids with high Re and vol.% values. Furthermore, by increasing the Re and vol.% values of the hybrid nanofluids, the bottom wall temperature, total thermal resistance, and thermal entropy generation rate decreased, and an increased temperature uniformity was obtained on the bottom surface of the MCHSs. In conclusion, the applied hybrid nanofluids are considered to be more promising heat transfer fluids when compared with conventional fluids such as water. Particularly, the CuO/MgO/TiO 2 -water ternary hybrid nanofluid exhibited a better heat transfer efficiency than did the MgO/TiO 2 -water binary hybrid nanofluid.

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Section: Frictional Entropy Generationsupporting

confidence: 90%

Thermohydraulic performance improvement and entropy generation characteristics of a microchannel heat sink cooled with new hybrid nanofluids containing ternary/binary hybrid nanocomposites

Souby

Bargal

Wang

2021

Energy Science & Engineering

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“…López et al [15] found that Nu increases on the hot wall of a porous microchannel and decreases on its cold wall by increasing φ and injecting the flow. Jalali and Karimipour [16] reported that Nu increases with Re and φ. Convective heat transfer and entropy generation of Ag-MgO/water hybrid nanofluid in microchannel are discussed by Uysal and Korkmaz [17]. They found that heat transfer increases as the volume fraction of hybrid nanofluid increases.…”

Section: Introductionmentioning

confidence: 99%

Nanofluid flow in a microchannel with inclined cross-flow injection

2019

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This paper investigates forced convection of water/Al 2 O 3 nanofluid flow in a microchannel with inclined cross-flow injection on the lower wall. There are a number of injecting holes on its lower wall. Other walls are insulated. The effect of different parameters including injection angle and number of injections on slip flow and heat transfer is investigated. It is concluded that increasing the injection angle up to 94° lead to an enhancement of the slip velocity and the Nusselt number on the microchannel walls. The results demonstrate that maximum heat transfer corresponds to the injection angle of 94°. It is revealed that the variation of Nusselt number decreases with the number of injection. As the volume fraction of nanoparticles increases, the heat transfer rate increases.

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“…It was observed that the heat transfer rate and increasing values of NP had a proportionate relationship. Uysal et al 23 concluded that the Nusselt number increases linearly with increasing Reynolds number.…”

Section: Resultsmentioning

confidence: 99%

“…22 The researchers showed that incorporating NP into a base fluid increases heat transfer. Uysal and Korkmaz 23 numerically studied the entropy generation of a hybrid nanofluid flow through a rectangular mini-channel. The results reveal that the convective heat transfer and S tot of the Ag-MgO/water hybrid nanofluid increased when the NP concentration increased.…”

mentioning

confidence: 99%

Mixed convection and entropy production of a hybrid nanofluid in a porous cylindrical enclosure with rotating top wall

Bellout

Bessaïh

2022

Heat Trans

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A numerical study is carried out to investigate heat transfer and entropy production of a hybrid nanofluid in a porous cylindrical enclosure with a rotating top wall. The bottom wall of the cylinder is taken as hot, the sidewall is adiabatic, except the top wall is considered cold and rotates at an angular velocity (ΩR). The effects of a hybrid nanofluid flow on heat transfer and entropy generation are examined for an aspect ratio (H/R = 1). A FORTRAN program was elaborated for solving the governing equations based on the finite volume method. Good agreement was found when comparing results from this study against published data. Our results are presented for different Reynolds number values (100 ≤ Re ≤ 1500), nanoparticle fraction NP (0 ≤ ϕ ≤ 0.08), Darcy number (10−4 ≤ Da ≤ 10−1) and porosity of the porous medium (0.2 ≤ ε ≤ 0.99) for Ri = 0.5, 1,5 and 8, where (Ri = Gr/Re2). They reveal that the heat transfer increases with Re, ϕ, Da, Ri, and decreasing ε. The simulation data were used to propose four different correlations for trueNu ̅ and Stot as Re, Da, Ri, ϕ, and ε.

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Estimation of Entropy Generation for Ag-MgO/Water Hybrid Nanofluid Flow through Rectangular Minichannel by Using Artificial Neural Network

Cited by 8 publications

References 38 publications

Thermohydraulic performance improvement and entropy generation characteristics of a microchannel heat sink cooled with new hybrid nanofluids containing ternary/binary hybrid nanocomposites

Thermohydraulic performance improvement and entropy generation characteristics of a microchannel heat sink cooled with new hybrid nanofluids containing ternary/binary hybrid nanocomposites

Nanofluid flow in a microchannel with inclined cross-flow injection

Mixed convection and entropy production of a hybrid nanofluid in a porous cylindrical enclosure with rotating top wall

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