Analysis of natural convection in nanofluid-filled H-shaped cavity by entropy generation and heatline visualization using lattice Boltzmann method

Rahimi, Alireza; Sepehr, Mohammad Noori; Lariche, Milad Janghorban; Mesbah, Mohammad; Kasaeipoor, Abbas; Malekshah, Emad Hasani

doi:10.1016/j.physe.2017.12.003

Cited by 92 publications

(31 citation statements)

References 48 publications

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“…It was reported that the increase in loading ratio of nanoparticle in the base fluid caused an increment of total entropy generation. Rahimi et al (2018) used the SiO2-TiO2/Water-Ethylene glycol (60:40) nanofluid in a square channel. The results showed that the total entropy generation showed a descending trend with the increment of nanofluid volume fraction.…”

Section: Introductionmentioning

confidence: 99%

Grafen-Demir Oksit Hibrit Nanoakışkanı Kullanılan Bir Isı Değiştirici Borusunun Entropi Üretim Analizi

Keklikçioğlu¹

2021

European Journal of Science and Technology

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In this study, the entropy generation analysis of the Graphene-Iron Oxide-Water hybrid nanofluid with six different volumetric fractions in the range of 0.5-1% in a heat exchanger tube under turbulent flow conditions was numerically investigated. The constant surface heat flux was applied to the tube and the Reynolds number was obtained in the range of 10000-50000. The k − ε RNG solver method was selected for the turbulence method and grid independence was checked. According to the results examining the dimensionless entropy production, entropy production showed a descending trend with the increment of hybrid nanofluid volume fraction. For the dimensionless entropy generation number, which increased with the increasing Reynolds number, configurations above unity were found at the volumetric fractions of 0.5, 0.6, 0.7 and 0.8 %, in addition, all values for entropy generation number with the volume fractions of 0.9 and 1 % were realized below unity up to the Reynolds number of 40000. This result showed that the use Graphene-Iron oxide of hybrid nanofluid in heat exchangers provides great advantages in terms of thermodynamics.

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Section: Introductionmentioning

confidence: 99%

Grafen-Demir Oksit Hibrit Nanoakışkanı Kullanılan Bir Isı Değiştirici Borusunun Entropi Üretim Analizi

Keklikçioğlu¹

2021

European Journal of Science and Technology

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“…It has been observed that the heat transfer decreases with increasing magnetic field applied to the cavity. Rahimi et al [34] analyzed the entropy generation and heat lines depending on different aspect ratios, solid volume fraction and Rayleigh number parameters of H-shaped cavity filled with hybrid nanofluid which includes SiO 2 -TiO 2 / H 2 O-EG. They determined that the total entropy generation decreased with increasing solid volume fraction and the heat transfer increased.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of entropy generation in a square cavity filled with boron-water nanofluid

Şahin

2020

J Braz. Soc. Mech. Sci. Eng.

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The entropy generation and natural convection in a square cavity filled with boron-water nanofluid is numerically investigated under the influence of different nanoparticle volume fractions and buoyancy forces when heated from left vertical wall and cooled from right vertical wall while horizontal walls are insulated. The results are compared with copper (Cu) and aluminum oxide (Al 2 O 3) nanoparticles generally used in the applications. Differential equations are discretized over the SIMPLE algorithm and solved iteratively using the finite control volume method. Entropy generation contours due to heat transfer and fluid friction are presented. Local and average Bejan numbers are also investigated. The results of the study show that the entropy generation increases with the increase in Rayleigh number for all nanoparticles, and fluid friction irreversibility is more dominant in entropy generation with increasing Rayleigh number, and almost all entropy generation is caused by fluid friction in high Rayleigh numbers.

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“…The preparation of nanofluids by the addition of nanoparticles to the base fluid should not be considered as a simple solid–liquid mixture 10,15‐18 . Because nanofluid preparation requires special conditions, some of these special conditions include suspension uniformity, suspension stability, and low particle mass, and no change in fluid chemical nature 19‐23 . Different approaches are used to achieve such special properties.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of exergetic performance of Al₂O₃ nanofluid in a double‐pipe heat exchanger fitted by a new modified twisted tape

Shirazi

2020

Heat Trans

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The use of nanofluids and surface enhancers today are among the new technologies used to increase heat transfer. In this study, heat transfer phenomena in heat exchanger were investigated using Al2O3 nanoparticles and modified spiral band as flow turbulator. Results are verified with well‐known correlations. The results show that the tube with cross‐hollow twisted tape inserts has the best exergetic performance for different hollow widths of the tape. Clearance, which is defined as the width between the tube and twisted tape, also affects the heat transfer performance. The smaller the clearance, the better is the exergetic performance. The tube can achieve the best exergetic performance when the number of unilateral twisted tapes is four. The results showed that increasing nanofluid concentration improves exergetic performance.

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Analysis of natural convection in nanofluid-filled H-shaped cavity by entropy generation and heatline visualization using lattice Boltzmann method

Cited by 92 publications

References 48 publications

Grafen-Demir Oksit Hibrit Nanoakışkanı Kullanılan Bir Isı Değiştirici Borusunun Entropi Üretim Analizi

Grafen-Demir Oksit Hibrit Nanoakışkanı Kullanılan Bir Isı Değiştirici Borusunun Entropi Üretim Analizi

Numerical analysis of entropy generation in a square cavity filled with boron-water nanofluid

Experimental study of exergetic performance of Al₂O₃ nanofluid in a double‐pipe heat exchanger fitted by a new modified twisted tape

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Analysis of natural convection in nanofluid-filled H-shaped cavity by entropy generation and heatline visualization using lattice Boltzmann method

Cited by 92 publications

References 48 publications

Grafen-Demir Oksit Hibrit Nanoakışkanı Kullanılan Bir Isı Değiştirici Borusunun Entropi Üretim Analizi

Grafen-Demir Oksit Hibrit Nanoakışkanı Kullanılan Bir Isı Değiştirici Borusunun Entropi Üretim Analizi

Numerical analysis of entropy generation in a square cavity filled with boron-water nanofluid

Experimental study of exergetic performance of Al2O3 nanofluid in a double‐pipe heat exchanger fitted by a new modified twisted tape

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Product

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Experimental study of exergetic performance of Al₂O₃ nanofluid in a double‐pipe heat exchanger fitted by a new modified twisted tape