Buoyant convective flow of different hybrid nanoliquids in a non-uniformly heated annulus

Reddy, N. Keerthi; Swamy, H. A. Kumara; Sankar, M.

doi:10.1140/epjs/s11734-021-00034-y

Cited by 33 publications

(10 citation statements)

References 42 publications

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“…Hartmann numbers. Recently, the effect of different nanoparticles on fluidity and thermal dissipation rate under various constraints has been investigated and proposed the suitable combination of parametric values to improve HTR in the annular domain (Reddy et al, 2021;Lakshmi et al, 2021).…”

Section: Entropy Generation Of Nanofluidmentioning

confidence: 99%

Effect of solid obstacle and thermal conditions on convective flow and entropy generation of nanofluid filled in a cylindrical chamber

Swamy,

Mani,

Reddy

et al. 2023

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Purpose One of the major challenges in the design of thermal equipment is to minimize the entropy production and enhance the thermal dissipation rate for improving energy efficiency of the devices. In several industrial applications, the structure of thermal device is cylindrical shape. In this regard, this paper aims to explore the impact of isothermal cylindrical solid block on nanofluid (Ag – H2O) convective flow and entropy generation in a cylindrical annular chamber subjected to different thermal conditions. Furthermore, the present study also addresses the structural impact of cylindrical solid block placed at the center of annular domain. Design/methodology/approach The alternating direction implicit and successive over relaxation techniques are used in the current investigation to solve the coupled partial differential equations. Furthermore, estimation of average Nusselt number and total entropy generation involves integration and is achieved by Simpson and Trapezoidal’s rules, respectively. Mesh independence checks have been carried out to ensure the accuracy of numerical results. Findings Computations have been performed to analyze the simultaneous multiple influences, such as different thermal conditions, size and aspect ratio of the hot obstacle, Rayleigh number and nanoparticle shape on buoyancy-driven nanoliquid movement, heat dissipation, irreversibility distribution, cup-mixing temperature and performance evaluation criteria in an annular chamber. The computational results reveal that the nanoparticle shape and obstacle size produce conducive situation for increasing system’s thermal efficiency. Furthermore, utilization of nonspherical shaped nanoparticles enhances the heat transfer rate with minimum entropy generation in the enclosure. Also, greater performance evaluation criteria has been noticed for larger obstacle for both uniform and nonuniform heating. Research limitations/implications The current numerical investigation can be extended to further explore the thermal performance with different positions of solid obstacle, inclination angles, by applying Lorentz force, internal heat generation and so on numerically or experimentally. Originality/value A pioneering numerical investigation on the structural influence of hot solid block on the convective nanofluid flow, energy transport and entropy production in an annular space has been analyzed. The results in the present study are novel, related to various modern industrial applications. These results could be used as a firsthand information for the design engineers to obtain highly efficient thermal systems.

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Section: Entropy Generation Of Nanofluidmentioning

confidence: 99%

Effect of solid obstacle and thermal conditions on convective flow and entropy generation of nanofluid filled in a cylindrical chamber

Swamy,

Mani,

Reddy

et al. 2023

HFF

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“…[10] recently published the results of another investigation on the addition of multi-walled carbon nanoparticles to the dynamics of water within a vertical Cleveland Z-staggered cavity, which demonstrated that raising the Reynold number increases the inertial force. [11] revealed that an optimal mix of nanoparticles is another essential feature in increasing thermal transfer in an annular geometry comprising nanoliquids with variably heated borders. According to [12], adding nanoparticles to the base fluid reduces the strength of fluid flow and the rate of heat transmission.…”

Section: Background Informationmentioning

confidence: 99%

“…Aluminum oxide is useful to improve the rheological and filtration properties of drilling fluid. Some hybrid nanoliquids flow owing to buoyancy across a non-uniformly heated annulus, as examined by [15], Oke [16], [17], [18], and [19]. It was discovered that the proper mix of nanoparticles is a critical criterion for improving heat transfer.…”

Section: Background Informationmentioning

confidence: 99%

Effects of Branched Fins on Alumina and N-Octadecane Melting Performance Inside Energy Storage System

et al. 2022

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The importance of Phase change material (PCM) energy storage systems is no longer new in the industry. However, the influence of using branched fins inside the energy storage system on the melting process of alumina nanoparticles and n-octadecane has not been reported in the literature. Consequently, the outcome of a study on the numerical simulation for optimizing the melting performance of a PCM in various tubes, including those with branching fins is presented in this report. Four examples were assessed in relation to a suspension of alumina nanoparticles and n-octadecane paraffin that contains heated fins. A numerical technique based on the Galerkin finite element method (GFEM) was used to solve the dimensionless governing system. The average liquid percentage over the flow zone in question was computed. The primary results indicated that altering the number of heated fins might affect the flow structures, the system’s irreversibility, and the melting process. Case four, with eight heated fins, likewise produces the greatest average liquid fraction values and completes the melting process in 850s. Additionally, when 6% nano-enhanced PCM was used instead of pure PCM, the melting process is accelerated by 28.57 percent.

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“…Choosing the best hybrid combination of nanoparticles suspended in water produces better heat transfer performance than Cu − H 2 O . Several researchers have conducted experimental studies in recent years to improve the heat transmission properties of mono- and hybrid nanofluids (Reddy et al , 2021; Al-Kouz et al , 2021; Vijayalakshmi and Sivaraj, 2022; Thirumalaisamy et al , 2022; Thirumalaisamy and Sivaraj, 2023). They synthesized hybrid nanofluids by using different combinations of nanoparticles suspended in base fluids.…”

Section: Introductionmentioning

confidence: 99%

Numerical computation on MHD natural convective ternary nanofluid flow and heat transfer in a porous square cavity: Marker-and-cell technique

Thirumalaisamy

Reddy

2023

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Purpose The analysis of fluid flow and thermal transport performance inside the cavity has found numerous applications in various engineering fields, such as nuclear reactors and solar collectors. Nowadays, researchers are concentrating on improving heat transfer by using ternary nanofluids. With this motivation, the present study analyzes the natural convective flow and heat transfer efficiency of ternary nanofluids in different types of porous square cavities. Design/methodology/approach The cavity inclination angle is fixed ω = 0 in case (I) and ω=π4 in case (II). The traditional fluid is water, and Fe3O4+MWCNT+Cu/H2O is treated as a working fluid. Ternary nanofluid's thermophysical properties are considered, according to the Tiwari–Das model. The marker-and-cell numerical scheme is adopted to solve the transformed dimensionless mathematical model with associated initial–boundary conditions. Findings The average heat transfer rate is computed for four combinations of ternary nanofluids: Fe3O4(25%)+MWCNT(25%)+Cu(50%),Fe3O4(50%)+MWCNT(25%)+Cu(25%),Fe3O4(33.3%)+MWCNT(33.3%)+Cu(33.3%) and Fe3O4(25%)+MWCNT(50%)+Cu(25%) under the influence of various physical factors such as volume fraction of nanoparticles, inclined magnetic field, cavity inclination angle, porous medium, internal heat generation/absorption and thermal radiation. The transport phenomena within the square cavity are graphically displayed via streamlines, isotherms, local and average Nusselt number profiles with adequate physical interpretations. Practical implications The purpose of this study is to determine whether the ternary nanofluids may be used to achieve the high thermal transmission in nuclear power systems, generators and electronic device applications. Social implications The current analysis is useful to improve the thermal features of nuclear reactors, solar collectors, energy storage and hybrid fuel cells. Originality/value To the best of the authors’ knowledge, no research has been carried out related to the magneto-hydrodynamic natural convective Fe3O4+MWCNT+Cu/H2O ternary nanofluid flow and heat transmission filled in porous square cavities with an inclined cavity angle. The computational outcomes revealed that the average heat transfer depends not only on the nanoparticle’s volume concentration but also on the existence of heat source and sink.

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Buoyant convective flow of different hybrid nanoliquids in a non-uniformly heated annulus

Cited by 33 publications

References 42 publications

Effect of solid obstacle and thermal conditions on convective flow and entropy generation of nanofluid filled in a cylindrical chamber

Effect of solid obstacle and thermal conditions on convective flow and entropy generation of nanofluid filled in a cylindrical chamber

Effects of Branched Fins on Alumina and N-Octadecane Melting Performance Inside Energy Storage System

Numerical computation on MHD natural convective ternary nanofluid flow and heat transfer in a porous square cavity: Marker-and-cell technique

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