Numerical study on natural convection of Ag–MgO hybrid/water nanofluid inside a porous enclosure: A local thermal non-equilibrium model

Mehryan, S.A.M.; Ghalambaz, Mohammad; Chamkha, Ali J.; Izadi, Mohsen

doi:10.1016/j.powtec.2020.04.005

Cited by 169 publications

(47 citation statements)

References 55 publications

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“…The use of porous media in industrial equipment has been considered to be a practical procedure for ameliorating the heat transfer, which has attracted the attentions of many researchers [ 22 , 23 , 24 , 25 , 26 , 27 , 28 ]. The partial employment of the porous media in the core of a sinusoidal channel was explored by Akbarzadeh and Maghrebi [ 29 ].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Forced Convection Enhancement and Entropy Generation of Nanofluid Flow through a Corrugated Minichannel Filled with a Porous Media

Aminian

Moghadasi

Saffari

et al. 2020

Entropy

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Corrugating channel wall is considered to be an efficient procedure for achieving improved heat transfer. Further enhancement can be obtained through the utilization of nanofluids and porous media with high thermal conductivity. This paper presents the effect of geometrical parameters for the determination of an appropriate configuration. Furthermore, the optimization of forced convective heat transfer and fluid/nanofluid flow through a sinusoidal wavy-channel inside a porous medium is performed through the optimization of entropy generation. The fluid flow in porous media is considered to be laminar and Darcy–Brinkman–Forchheimer model has been utilized. The obtained results were compared with the corresponding numerical data in order to ensure the accuracy and reliability of the numerical procedure. As a result, increasing the Darcy number leads to the increased portion of thermal entropy generation as well as the decreased portion of frictional entropy generation in all configurations. Moreover, configuration with wavelength of 10 mm, amplitude of 0.5 mm and phase shift of 60° was selected as an optimum geometry for further investigations on the addition of nanoparticles. Additionally, increasing trend of average Nusselt number and friction factor, besides the decreasing trend of performance evaluation criteria (PEC) index, were inferred by increasing the volume fraction of the nanofluid (Al2O3 and CuO).

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Section: Introductionmentioning

confidence: 99%

Investigation of Forced Convection Enhancement and Entropy Generation of Nanofluid Flow through a Corrugated Minichannel Filled with a Porous Media

Aminian

Moghadasi

Saffari

et al. 2020

Entropy

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“…The flowing hybrid nanofluid in a cavity has also been one of the trendy topics in fluid dynamics due to its significance in engineering applications like heat exchangers, heating, ventilation, and air conditioning, and building insulation. Ghalambaz et al 5 and Mehryan et al 6 numerically investigated the natural convection flow of Ag‐MgO/water hybrid nanofluid inside a square cavity and porous enclosure, respectively. They also considered different approaches to evaluate the thermal conductivity and dynamic viscosity of the hybrid nanofluid.…”

Section: Introductionmentioning

confidence: 99%

Effect of suction on the stagnation point flow of hybrid nanofluid toward a permeable and vertical Riga plate

et al. 2020

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The application of appropriate wall mass suction (transpiration) has been reported as the key factor to generate steady solutions in the opposing flow (shrinking or opposing buoyancy). This study features the impact of the suction and mixed convection parameters in the stagnation point flow toward a permeable Riga plate. Due to the capability of hybrid nanofluids in enhancing the heat transfer performance, the combination of copper (Cu) and alumina (Al2O3) nanoparticles are used, including water as the base fluid. It appears that the dual solutions are potential in this problem with the negligence of the suction parameter. However, this transpiration effect is efficient in delaying the separation process of the hybrid nanofluid flow and enhancing the heat transfer rate. The heat transfer rate augments with the addition of ϕ 2 and S. The increment of heat transfer rate is reported between 34% and 39% when 30% of the suction parameter ( S = 0.3 ) is applied. Besides, the addition of the mixed convection parameter from the opposing to assisting flow enlarges the velocity profile while reduces the temperature profile. The reduction of temperature distribution with an upsurge of suction, mixed convection, and EMHD parameters implies the operating heat transfer process.

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“…Applying additive nanoparticles to the base fluid to enhance the thermophysical properties of the working fluid has also been considered as an effective technique to modify heat transfer [ 12 , 13 ]. The hybrid nanofluids such as Ag–MgO–water [ 14 , 15 ], Ag–TiO 2 [ 16 ], Cu–Al 2 O 3 [ 16 , 17 ], and MgO–MWCNTs/EG [ 18 ] as well as using of nonencapsulated phase change material suspension [ 19 ] are also promising for enhancement of heat transfer. On the other hand, combining different techniques to promote the thermohydraulic performance of thermal engineering systems as much as possible has been paid a lot of attention in recent years [ 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Overlapped Twisted Tapes Inserted in a Double-Pipe Heat Exchanger Using Two-Phase Nanofluid

Ghalambaz

Arasteh

Mashayekhi³

et al. 2020

Nanomaterials

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This study investigated the laminar convective heat transfer and fluid flow of Al2O3 nanofluid in a counter flow double-pipe heat exchanger equipped with overlapped twisted tape inserts in both inner and outer tubes. Two models of the same (co-swirling twisted tapes) and opposite (counter-swirling twisted tapes) angular directions for the stationary twisted tapes were considered. The computational fluid dynamic simulations were conducted through varying the design parameters, including the angular direction of twisted tape inserts, nanofluid volume concentration, and Reynolds number. It was found that inserting the overlapped twisted tapes in the heat exchanger significantly increases the thermal performance as well as the friction factor compared with the plain heat exchanger. The results indicate that models of co-swirling twisted tapes and counter-swirling twisted tapes increase the average Nusselt number by almost 35.2–66.2% and 42.1–68.7% over the Reynolds number ranging 250–1000, respectively. To assess the interplay between heat transfer enhancement and pressure loss penalty, the dimensionless number of performance evaluation criterion was calculated for all the captured configurations. Ultimately, the highest value of performance evaluation criterion is equal to 1.40 and 1.26 at inner and outer tubes at the Reynolds number of 1000 and the volume fraction of 3% in the case of counter-swirling twisted tapes model.

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Numerical study on natural convection of Ag–MgO hybrid/water nanofluid inside a porous enclosure: A local thermal non-equilibrium model

Cited by 169 publications

References 55 publications

Investigation of Forced Convection Enhancement and Entropy Generation of Nanofluid Flow through a Corrugated Minichannel Filled with a Porous Media

Investigation of Forced Convection Enhancement and Entropy Generation of Nanofluid Flow through a Corrugated Minichannel Filled with a Porous Media

Effect of suction on the stagnation point flow of hybrid nanofluid toward a permeable and vertical Riga plate

Investigation of Overlapped Twisted Tapes Inserted in a Double-Pipe Heat Exchanger Using Two-Phase Nanofluid

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