Parametric study of natural convection heat transfer from an inclined rectangular cylinder embedded in a square enclosure

Olayemi, Olalekan Adebayo; Al‐Farhany, Khaled; Temitope, Olabemiwo Jekayinoluwa; Victor, Ogunwoye Oloruntobiloba; Odetunde, Christopher; Adegun, I. K.

doi:10.1080/14484846.2021.1913853

Cited by 32 publications

(18 citation statements)

References 40 publications

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“…The first accurate computational solution of equations that describe 2-D natural convection in a square enclosure subjected to various thermal boundary conditions was done by De Vahl Davis (1983). In recent times, because many similar works had been done prior to 2019, many researchers have also carried out multiple studies with similar cavities using different solution methods (Obalalu, 2021;Olayemi et al, 2021a;Olayemi et al, 2021b).…”

Section: Introductionmentioning

confidence: 99%

Effects of Geometric Ratios on Heat Transfer in Heated Cylinders: Modelling and Simulation

Olayemi¹,

Obalalu²,

Ibitoye³

et al. 2023

Nig. J. Technol. Dev.

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The application of fluid and heat transfer in electronic and nuclear technology is gaining popularity, particularly in equipment's life span and risk management. However, further study is required for applications involving rectangular cylinders placed inside a square cavity. This study investigates the effects of height ratio (𝐻𝑅), and width ratio (𝑊𝑅) for Prandtl number 𝑃𝑟=0.71 on natural convective heat transfer and the flow field around the annulus of a square domain fitted internally with a heated rectangular cylinder. The square enclosure and the inner rectangular cylinder walls were respectively maintained at cold and hot isothermal conditions. COMSOL Multiphysics (Version 5.6) software was adopted to implement the governing equations and boundary conditions. The results are presented in the form of streamlines, isothermal contours, and Nusselt number (Nu). The study reveals that the combined average Nu of the rectangular cylinder walls improves with 𝐻𝑅, 𝑊𝑅, and Rayleigh number (Ra). The maximum Nu occurred at 𝐻𝑅=0.7, and 𝑊𝑅=0.7; however, height variation at peak average Nu was 37.7% greater than width variation at peak average Nu. This study finds applications in the cooling of electronic chips and aerospace engines.

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Section: Introductionmentioning

confidence: 99%

Effects of Geometric Ratios on Heat Transfer in Heated Cylinders: Modelling and Simulation

Olayemi¹,

Obalalu²,

Ibitoye³

et al. 2023

Nig. J. Technol. Dev.

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“…The data showed that increasing the Darcy number directly with the modified Rayleigh number and fin dimension increased the average Nusselt number. They also reviewed current research for natural convection in cavities of different shapes with internal hosts, such as the MHD effect and double diffusion [ 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 ].…”

Section: Introductionmentioning

confidence: 99%

The Baffle Length Effects on the Natural Convection in Nanofluid-Filled Square Enclosure with Sinusoidal Temperature

et al. 2022

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The proper process of applying heat to many technological devices is a significant challenge. There are many nanofluids of different sizes used inside the system. The current study combines this potential to improve convection effects, considering numerical simulations of natural convection using Cu/water nanofluids in a square enclosure with bottom blocks embedded in baffles. The enclosure consists of two vertical walls with isothermal boundary conditions; the left wall is the sinusoidal heat source, whereas the right wall is cooled. The investigations dealt with the influences of nanoparticle concentration, Rayleigh number, baffle length, and thermal conductivity ratioon isotherms, stream functions, and average Nusselt number. The results present that, when the Rayleigh number rises, the fluid flow velocity increases, and the heat transfer improves. Furthermore, the baffle length case (Lb = 0.3) provides higher heat transfer characteristics than other baffle height cases.

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“…Olayemi et al 11 considered buoyancy‐dependent flow in a square domain, which housed a heated rectangular obstacle; the assessment conducted revealed that at AR = 0.1, the Nu av is invariant at the orientation of

0^\circ

and

90^\circ

. Ismael et al 12 analyzed mixed convective flow in a porous domain containing two spinning cylinders.…”

Section: Introductionmentioning

confidence: 99%

Magnetoconvection around an elliptic cylinder placed in a lid‐driven square enclosure subjected to internal heat generation or absorption

Olayemi

Al‐Farhany

Obalalu³

et al. 2022

Heat Trans

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The impacts of MHD and heat generation/absorption on lid‐driven convective fluid flow occasioned by a lid‐driven square enclosure housing an elliptic cylinder have been investigated numerically. The elliptic cylinder and the horizontal enclosure boundaries were insulated and the left vertical lid‐driven wall was experienced at a fixed hot temperature, and the right wall was exposed to a fixed cold temperature. COMSOL Multiphysics 5.6 software was used to resolve the nondimensional equations governing flow physics. A set of parameters, such as Hartmann number (0 ≤ italicHa ≤ 50 $0\le {Ha}\le 50$), Reynolds number (1 0 2 ≤ italicRe ≤ 1 0 3 $1{0}^{2}\le {Re}\le 1{0}^{3}$), Grashof number (1 0 2 ≤ italicGr ≤ 1 0 5 $1{0}^{2}\le {Gr}\le 1{0}^{5}$), heat generation‐absorption parameter (− 3 ≤ J ≤ 3 $-3\le J\le 3$), and elliptical cylinder aspect ratio (AR) (1.0 ≤ italicAR ≤ 3.0 $1.0\le {AR}\le 3.0$) have been investigated. The current study discovered that for low Reynolds number, the adiabatic cylinder AR of 2.0 provided the optimum heat transfer enhancement for the model investigated, also the impact of cylinder size diminishes beyond Gr = 104. But for high Reynolds (Re = 1000), the size of the cylinder with AR = 3.0 offered the highest heat transfer augmentation. The clockwise flow circulation reduces because of an increase in AR, which hinders the flow circulation. In addition, heat absorption supports heat transfer augmentation while heat generation can suppress heat transfer improvement.

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Parametric study of natural convection heat transfer from an inclined rectangular cylinder embedded in a square enclosure

Cited by 32 publications

References 40 publications

Effects of Geometric Ratios on Heat Transfer in Heated Cylinders: Modelling and Simulation

Effects of Geometric Ratios on Heat Transfer in Heated Cylinders: Modelling and Simulation

The Baffle Length Effects on the Natural Convection in Nanofluid-Filled Square Enclosure with Sinusoidal Temperature

Magnetoconvection around an elliptic cylinder placed in a lid‐driven square enclosure subjected to internal heat generation or absorption

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