Thermo-dynamic irreversibility induced by natural convection in square enclosure with inner cylinder. Part-I: Effect of tilted angle of enclosure

Mun, Gi Su; Doo, Jeong Hoon; Ha, Man Yeong

doi:10.1016/j.ijheatmasstransfer.2016.02.055

Cited by 27 publications

(3 citation statements)

References 33 publications

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“…Prandtl number reduces total EG in the cavity (Mun et al, 2016). Alsabery et al (2018) studied the effect of solid adiabatic block on nanofluid movement, EG and HTR and reported that the optimization of system efficiency could be controlled by thermal conductivity ratio and block size.…”

Section: Entropy Generation Of Nanofluidmentioning

confidence: 99%

“…Sheikhzadeh et al (2012) made computational analysis to address the impact of hot square block mounted at the central region of nanofluid-filled cavity and reported that an increase in the block size has better thermal efficiency (maximum HTR with minimum EG) at lower Rayleigh number. The influence of cylindrical isothermal body located at the central region of tilted enclosure has been analyzed on fluid flow and EG and found that decrease in Prandtl number reduces total EG in the cavity (Mun et al , 2016). Alsabery et al (2018) studied the effect of solid adiabatic block on nanofluid movement, EG and HTR and reported that the optimization of system efficiency could be controlled by thermal conductivity ratio and block size.…”

Section: Introductionmentioning

confidence: 99%

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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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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%

Section: Introductionmentioning

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

View full text Add to dashboard Cite

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“…Park et al 8 analyzed the natural convection heat transfer provoked by a temperature difference in a cold external square cavity and four hot interior circular cylinders arranged in a rectangular array. Mun et al 9 investigated natural convection heat transfer influenced by a temperature gradient in a sloped square cavity containing a hot internal circular cylinder for different Prandtl (10 −2 ≤ Pr ≤ 10 2 ) and Rayleigh numbers (10 3 ≤ Ra ≤ 10 6 ). According to El Moutaouakil et al, 10 the lattice Boltzmann method tests study the laminar natural convection in a square cavity containing a horizontal hexagonal cylinder filled with water at center.…”

Section: Introductionmentioning

confidence: 99%

Numerical research of double‐diffusive natural convection in elliptical cylinders: Effect of thermal Rayleigh number

et al. 2020

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This paper is the first part of a two-part study, and it presented numerical research of double-diffusive natural convection within an annulus area, situated in two horizontal confocal elliptic solids charged by a Newtonian fluid. The elliptical coordinates were used to transform the physical domain into a rectangular one. To resolve the governing equations and the boundary layer conditions, a calculator code based on the finite volume approach was developed. The details of the influences of thermal Rayleigh number on heat and mass transfer were investigated. Results obtained were compared with those existing in other reasearch works. K E Y W O R D S double-diffusive, elliptical cylinders, natural convection, Rayleigh number, stream function formulation

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Conjugate Natural Convection-Surface Radiation in a Square Cavity with an Inner Elliptic Body

Moutaouakil

Boukendil

Zrikem

et al. 2020

Lecture Notes in Intelligent Transportation and Infrastructure

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Thermo-dynamic irreversibility induced by natural convection in square enclosure with inner cylinder. Part-I: Effect of tilted angle of enclosure

Cited by 27 publications

References 33 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

Numerical research of double‐diffusive natural convection in elliptical cylinders: Effect of thermal Rayleigh number

Conjugate Natural Convection-Surface Radiation in a Square Cavity with an Inner Elliptic Body

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