Natural and mixed convection of a nanofluid in porous cavities: critical analysis using Buongiorno’s model

Zahmatkesh, İman; Habibi, Mohammad Reza

doi:10.15632/jtam-pl.57.1.221

Cited by 13 publications

(2 citation statements)

References 20 publications

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“…The consequence of a magnetic field on nanofluid transportation in an open porous cavity is something that researchers are investigating [ 69 ]. The effects of the Darcy, Rayleigh, and Hartmann numbers, as well as the volume fraction of CuO, on the behavior of hydrothermal systems are being studied.…”

Section: The Role Of Cavities In Nanofluid Transportmentioning

confidence: 99%

The Impact of Cavities in Different Thermal Applications of Nanofluids: A Review

et al. 2023

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Nanofluids and nanotechnology are very important in enhancing heat transfer due to the thermal conductivity of their nanoparticles, which play a vital role in heat transfer applications. Researchers have used cavities filled with nanofluids for two decades to increase the heat-transfer rate. This review also highlights a variety of theoretical and experimentally measured cavities by exploring the following parameters: the significance of cavities in nanofluids, the effects of nanoparticle concentration and nanoparticle material, the influence of the inclination angle of cavities, heater and cooler effects, and magnetic field effects in cavities. The different shapes of the cavities have several advantages in multiple applications, e.g., L-shaped cavities used in the cooling systems of nuclear and chemical reactors and electronic components. Open cavities such as ellipsoidal, triangular, trapezoidal, and hexagonal are applied in electronic equipment cooling, building heating and cooling, and automotive applications. Appropriate cavity design conserves energy and produces attractive heat-transfer rates. Circular microchannel heat exchangers perform best. Despite the high performance of circular cavities in micro heat exchangers, square cavities have more applications. The use of nanofluids has been found to improve thermal performance in all the cavities studied. According to the experimental data, nanofluid use has been proven to be a dependable solution for enhancing thermal efficiency. To improve performance, it is suggested that research focus on different shapes of nanoparticles less than 10 nm with the same design of the cavities in microchannel heat exchangers and solar collectors.

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Section: The Role Of Cavities In Nanofluid Transportmentioning

confidence: 99%

The Impact of Cavities in Different Thermal Applications of Nanofluids: A Review

et al. 2023

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“…Recent years have witnessed an extensive study on heat transfer of nanofluids as a consequence of their appropriate thermophysical properties (eg., Mahfoud and Bendjaghloli [10]; Singh et al [11]; Zahmatkesh and Naghedifar [12]; Zahmatkesh and Torshizi [13]; Zahmatkesh and Habibi [14]). Although a significant number of investigations on MHD free convection of nanofluids in cavities are available in the literature (e.g., Koopaee et al [15,16], Akinshilo and Ilegbusi [17]), only a few recent studies have considered this problem in porous media.…”

Section: Introductionmentioning

confidence: 99%

Effect of Magnetic Field Orientation on Nanofluid Free Convection in a Porous Cavity: A Heat Visualization Study

Zahmatkesh

2020

Journal of Thermal Engineering

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Effect of magnetic field orientation on free convection of several water-based nanofluids in a square porous cavity is analyzed in this study. To this aim, the heatline visualization technique is implemented for the first time. Moreover, streamlines and isotherms are employed to present fluid flow and temperature distribution. The governing equations are transformed into a dimensionless form and then solved using the finite-volume method. Computations are undertaken for different orientations and magnitudes of the imposed magnetic field in circumstances with distinct Rayleigh numbers and the nanoparticles types and volume fractions. The corresponding results are presented in terms of dimensionless distributions of streamlines, isotherms, and heatlines as well as numerical values of the flow strength and the average Nusselt number. Inspection of the results demonstrates that increase in the magnetic field strength deteriorates the heat transfer rate. This effect, however, diminishes with rise in the magnetic field inclination angle.

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Thermal and entropy analysis in L‐shaped non‐Darcian porous cavity saturated with nanofluids using Buongiorno model: Comparative study

Chamkha

Jomardiani

Ismael

et al. 2020

Math Methods in App Sciences

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The current paper deals with the natural convection and entropy generation in L‐shaped porous cavity filled with nanofluids obeying Buongiorno's two‐phase model. Forchheimer–Brinkman‐extended Darcy model is used to represent the macroscopic motion within the porous medium. The governing equations are solved using the finite volume method using OpenFoam software. We have added a house code in C++ to OpenFoam solver for reaching to the Buongiorno's two‐phase model and entropy generation. By alternative considering and ignoring, the roles of Brownian motion and the thermophoresis mechanisms are examined. A comparative study is carried out on these aspects based on the thermal performance criterion. The results show that the thermophoresis diffusion effect is predominant over the Brownian diffusion effect. The Nusselt number and the total entropy generation are higher for svelte cavity. A cavity of aspect ratio of 0.5 and Al2O3 and CuO nanoparticles are proposed for best thermal performance.

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Natural and mixed convection of a nanofluid in porous cavities: critical analysis using Buongiorno’s model

Cited by 13 publications

References 20 publications

The Impact of Cavities in Different Thermal Applications of Nanofluids: A Review

The Impact of Cavities in Different Thermal Applications of Nanofluids: A Review

Effect of Magnetic Field Orientation on Nanofluid Free Convection in a Porous Cavity: A Heat Visualization Study

Thermal and entropy analysis in L‐shaped non‐Darcian porous cavity saturated with nanofluids using Buongiorno model: Comparative study

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