MHD mixed convection and entropy generation of CNT-water nanofluid in a wavy lid-driven porous enclosure at different boundary conditions

Hamzah, Hameed K.; Ali, Farooq H.; Hatami, M.

doi:10.1038/s41598-022-06957-3

Cited by 15 publications

(4 citation statements)

References 37 publications

(42 reference statements)

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“…They observed that the waviness of the lower surface of the cabinet could enhance the Nusselt number. Similar studies are available in the literature (Biswas et al , 2022; Das et al , 2003; Hamzah et al , 2022; Cho, 2019; Hansda et al , 2022; Hussain et al , 2017; Rudziva et al , 2022; Hansda and Pandit, 2022).…”

Section: Introductionsupporting

confidence: 65%

On the analysis of thermosolutal mixed convection in differentially heated and soluted geometries beyond rectangular

Hansda

Pandit

2023

HFF

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Purpose This paper aims to study the impact of convexity and concavity of the vertical borders on double-diffusive mixed convection. In addition, the study of entropy generation is performed. This numerical study has been carried out for different patterns of wavy edges to reveal their effects on heat and mass transfer phenomena. Design/methodology/approach Four different flow features are treated by varying the directions of convexity and concavity of the vertical walls. A uniform temperature, as well as concentration distributions, are introduced to the left border while keeping a cold temperature and low concentration for the right border. The horizontal boundaries are in adiabatic condition. The upper border of the chamber is moving in the right direction with an equal speed. The governing Navies–Stokes equations are designed to describe energy and species transport phenomena, and these equations are solved by compact scheme. Findings The investigated results are analyzed for various parameters, namely, Prandtl number, Richardson number, thermal Grashof number, Lewis number, Buoyancy ratio and amplitude of the wavy walls. It is observed that the thermal and solutal transfer performance becomes effective with lower Richardson numbers. The results reveal that the concavity and convexity of the side borders of the cabinet can control the thermosolutal performance. It is also observed that among all wavy chambers, Case-4 records maximum thermosolutal transfer rate, while Case-3 attains minimum thermosolutal transfer rate. Originality/value This work is an example of solar thermal power conversion, power collection systems, systems of energy deficiency, etc.

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Section: Introductionsupporting

confidence: 65%

On the analysis of thermosolutal mixed convection in differentially heated and soluted geometries beyond rectangular

Hansda

Pandit

2023

HFF

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“…Despite the abundance of work in the field of mixed convection of nanofluids and hybrid nanofluids, most of these studies have been limited to cases of unpartitioned cavities, and very few studies have been conducted using nanofluids and hybrid nanofluids in partitioned cavities. [5][6][7][8][9][10] In addition, work on the study of convective phenomena within ventilated cavities has mainly concerned simple and regular geometries (square, rectangular, etc.). On the other hand, few studies have dealt with the case of more complex geometries such as that of Tmartnhad et al 11 The latter numerically analyzed the heat transfer, in a trapezoidal cavity ventilated and crossed by air.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical investigation of turbulent mixed convection in a round bottom flask using a hybrid nanofluid

Baiti,

Salhi,

Chafai

2023

Advances in Mechanical Engineering

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In this study, we conducted a numerical investigation of the turbulent mixed convection of a hybrid nanofluid (HNF) in a flask equipped with an agitator, which is commonly used in organic chemistry synthesis. The bottom wall and the middle section of the flask were maintained at a constant high temperature Th, while the upper, left, and right walls up to the middle of the flask were kept at a low temperature Tc. The HNF consisted of Graphene (Gr) and Carbon nanotubes (CNTs) nanoparticles (NP) dispersed in pure water. The governing equations were solved numerically using the finite size approach and formulated using the Boussinesq approximation. The effects of the NP volume fraction φ (ranging from 0% to 6%), the Rayleigh number Ra (ranging from 104 to 106), and the Nusselt number ( Nu) were investigated in this simulation. The results indicated that the heat transfer is noticeably influenced by the Ra number and the increase in the φ ratio. Additionally, the agitator rotation speed had a slight effect on the heat transfer.

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“…The outcomes showed that the Bejan and mean Nusselt numbers stood in an inverse relationship with Ha and Ri numbers; additionally, increasing Ha caused the entropy generation rate to drop. Hamzah et al [19] studied the influence of Richardson and Darcy numbers on heat transfer and entropy generation in a wavy lid-driven porous container filled with CNT-water nanofluid. The results indicated that the mean Nusselt number was positively affected by the increased amplitude of the wavy wall, as well as Richardson and Darcy numbers.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of 3D MHD Mixed Convection and Entropy Generation in Trapezoidal Porous Enclosure Filled with a Hybrid Nanofluid: Effect of Zigzag Wall and Spinning Inner Cylinder

et al. 2022

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A numerical study was performed to analyze the impact of the combination of several factors on heat transfer rate, flow behavior, and entropy generation in a hybrid nanofluid occupying a porous trapezoid enclosure containing a rotating inner tube. The governing equations were discretized and solved using the Finite Element Method using Comsol multiphysics. The effects of the Darcy and Hartman number, nanoparticle volume fraction (from 0 to 6%), the utilization of various zigzag patterns of the hot wall, and the rotation speed of the inner tube (Ω = 100. 250 and 500) are illustrated and discussed in this work. The outputs reveal that flow intensity has an inverse relationship with Hartman number and a direct relationship with the Darcy number and the velocity of the inner tube, especially at high numbers of undulations of the zigzag hot wall (N = 4); also, intensification of heat transfer occurs with increasing nanoparticle volume fraction, Darcy number and velocity of the inner tube. In addition, entropy generation is strongly affected by the mentioned factors, where increasing the nanoparticle concentration augments the thermal entropy generation and reduces the friction entropy generation; furthermore, the same influence can be obtained by increasing the Hartman number or decreasing the Darcy number. However, the lowest entropy generation was found for the case of Ø = 0, Ha = 0 and Da = 0.01.

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MHD mixed convection and entropy generation of CNT-water nanofluid in a wavy lid-driven porous enclosure at different boundary conditions

Cited by 15 publications

References 37 publications

On the analysis of thermosolutal mixed convection in differentially heated and soluted geometries beyond rectangular

On the analysis of thermosolutal mixed convection in differentially heated and soluted geometries beyond rectangular

Numerical investigation of turbulent mixed convection in a round bottom flask using a hybrid nanofluid

Numerical Study of 3D MHD Mixed Convection and Entropy Generation in Trapezoidal Porous Enclosure Filled with a Hybrid Nanofluid: Effect of Zigzag Wall and Spinning Inner Cylinder

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