Numerical investigation of nanofluid mixed convection in a T-shaped cavity by considering a thermal barrier

Xia, Jian Sheng; Mostafavi, Mohammad; Alghazali, Tawfeeq; sadi, Sajad; Guerrero, John William Grimaldo; Suksatan, Wanich; Toghraie, Davood; Khan, Afrasyab

doi:10.1016/j.aej.2022.01.009

Cited by 13 publications

(4 citation statements)

References 49 publications

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“…The authors found that the driven walls cause a considerable enhancement of the heat transfer. A similar study was conducted by Xia et al [10] in a T-shaped cavity. Hatami et al [11] studied the mixed convection in a porous cavity saturated with various nanofluids (Al 2 O 3 , Cu and TiO 2 ).…”

Section: Introductionsupporting

confidence: 56%

Heat transfer enhancement in an inclined solar collector using partially driven cold wall and carbon nanotubes based nanofluid

2022

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In order to improve the performance of a solar collector in low heat transfer rate zones, a three-dimensional numerical study of the effects of partially moving wall sections and the use of a water nanofluid (CNT) in a tilted parallelepiped solar collector was performed. Equations governing the mixed convection phenomena occurring in the cavity are developed based on the three-dimensional potential-vorticity formulation and solved using the finite volume method (FVM). Two cases related to the direction of the moving surfaces are considered and compared to the base case (no driven walls). The results are presented in term of flow structures, temperature fields and local and average Nusselt numbers. The Richardson number (Ri) is varied from 0.001 to 10 and the CNTs volume fraction from 0 to 0.045. The results showed that for low Richardson values (less than 1), the motion direction of the moving surfaces has no significant effect on heat transfer rates and becomes effective for higher values. The highest rates of heat transfer are found for high Richardson values and CNTs volume fractions, while the enhancement ratio (compared to the base case) occurs for low Richardson values.

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Section: Introductionsupporting

confidence: 56%

Heat transfer enhancement in an inclined solar collector using partially driven cold wall and carbon nanotubes based nanofluid

2022

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“…8 In this regard, nanofluid is an efficient growing investigation field such that many experimental and numerical fact-finding have been tried in this field. [9][10][11][12] A numerical survey on the convective heat transfer of Al 2 O 3 -water nanofluids via a cylindrical pipe was conducted by Mahammedi et al 13 In light of their findings, a considerable enhancement in Nusselt number with enhancing volume fractions was observed, and also found that with the rise of nanoparticles concentration pressure losses enhanced. Behi et al 14 investigated the hydro-thermal effectiveness of Al 2 O 3 -water single-phase nanofluids in a manner that the laminar flow regime is governing.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of heat transfer and pressure drop of nanofluids in a combined porous media of hydrophobic and hydrophilic surfaces

Babaei

Aminian

Saffari

2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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The present study provides a 3D numerical research on the hydro-thermal performance of water-Al2O3/CuO nanofluids and water/Al2O3-CuO hybrid nanofluid inside a U-bend tube incorporating a porous medium with both hydrophilic and hydrophobic surfaces. Furthermore, a single-phase flow is adopted to simulate the nanofluid flow. Taking into consideration the equation of the Darcy-Brinkman-Forchheimer, to simulate the flow of fluids in the porous media. The influence of Dean number on hydro-thermal performance in the range of (600–1750) was investigated. And according to the results, Dn = 600 had the best performance. Considering the outcomes, a completely hydrophobic wall has a better hydro-thermal performance than a completely hydrophilic one and other hydrophilicity and hydrophobicity combinations. As well, improvement in heat transfer efficiency is considerably influenced by the Darcy number (10−4–10−1) and the augmentation of the porous thickness ratio. Additionally, average Nusselt number and pressure losses for any and all types of nanofluids show an incremental schema with augmenting volume fraction, while PEC exhibits a reducing pattern. Besides this, structures with permeable porous media or ones with Da = 0.1 and rp = 0.6 present the highest PEC. Also, among the reviewed nanoparticles, Al2O3 with a volume percentage of 1% had the maximum PEC.

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“…Feng et al [2022] removed a particular portion of the cavity, inserted a heat block there in a 2D porous cavity, and numerically performed convection heat transfer by varying the position of heat source. Xia et al [2022] considered a T-shaped lid driven cavity fitted with a thermal barrier and inserted combination of Al 2 O 3 -Water combination as nanofluid. They concluded that the highest amount of heat transfer and the Nusselt number are obtained when the geometrical position of the thermal barrier is near to the lid.…”

Section: Introductionmentioning

confidence: 99%

Forced Convection Characteristics with Parabolic Temperature Variations in a Transposed C-Shaped Lid-Driven Square Cavity using Lattice Boltzmann Method

Yadav

Makinde

2023

Preprint

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The present study is focused on the numerical simulations of forced convection characteristics with parabolic temperature variations in a wall-driven C-Shaped cavity using the lattice Boltzmann method. In this study, the flow parameters being investigated are Reynolds number, Nusselt number, skin friction coefficient, kinetic energy density function, and aspect ratio. The results show that the development of the primary vortex inside the cavity can lead to an assisting effect to the different hot surfaces for different aspect ratios to enhance the heat transfer rate. It is found that for aspect ratio one, the upper hot surface, assigned with parabolic temperature variations, gives the best heat transfer rate, whereas, for aspect ratios two and three, the right hot surface gives the best heat transfer rates. Further, The average Nusselt number is found to be increasing with the increase of Reynolds number and found to be decreasing with the increase of aspect ratio. Besides this, for low Reynolds numbers with elongation of the cavity in the horizontal direction, perfect sand clock patterns are recorded in the streamlines formation, whereas for high Reynolds numbers, the sand clock patterns become distorted in the streamlines formation. Moreover, the distribution of the skin friction coefficient and the kinetic energy density function against the Reynolds number is also presented.

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Numerical investigation of nanofluid mixed convection in a T-shaped cavity by considering a thermal barrier

Cited by 13 publications

References 49 publications

Heat transfer enhancement in an inclined solar collector using partially driven cold wall and carbon nanotubes based nanofluid

Heat transfer enhancement in an inclined solar collector using partially driven cold wall and carbon nanotubes based nanofluid

Numerical study of heat transfer and pressure drop of nanofluids in a combined porous media of hydrophobic and hydrophilic surfaces

Forced Convection Characteristics with Parabolic Temperature Variations in a Transposed C-Shaped Lid-Driven Square Cavity using Lattice Boltzmann Method

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