Numerical study of laminar natural convection inside square enclosure with single horizontal fin

Elatar, Ahmed; Teamah, Mohamed A.; Hassab, M.A.

doi:10.1016/j.ijthermalsci.2015.08.003

Cited by 106 publications

(44 citation statements)

References 25 publications

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“…The shapes of streamline contours are almost identical. For the isotherms, one can see the strong agreement of the present results with those by Tasnim and Collins [3] and Elatar et al [11] as seen in the figure.…”

Section: Program Validation and Comparison With Previous Worksupporting

confidence: 91%

“…The maximum derivation found was 1.5% for the case of . In addition, a comparison of the streamlines and isotherms is made for the present results with those of Tasnim and Collins [3] and Elatar et al [11] at ( ) as shown in Fig. 2.…”

Section: Program Validation and Comparison With Previous Workmentioning

confidence: 75%

“…First, the heat transfer by conduction was equated to the heat transfer by convection (11) where is the normal distance to coordinate surface. By introducing the dimensionless variables, defined in equation (5) into equation (11), local Nusselt number is defined as:…”

Section: Nusselt Numbermentioning

confidence: 99%

“…Xu [10] conducted numerical simulation on unsteady coupled thermal layers induced by a fin on the partition of a differentially heated cavity. Elatar et al [11] examined laminar natural convection inside square enclosure with adiabatic horizontal wall with a single horizontal fin attached to the hot wall at different positions and lengths. Ma et al [12] studied flows and heat transfer of the transition to an unsteady state in a finned cavity for different Prandtl numbers.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Investigation of Natural Convection Flow in a Hexagonal Enclosure Having Vertical Fin

2019

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Numerical study of natural convection flow in a hexagonal enclosure with a single vertical fin attached to its heated bottom wall has been carried out. Finite element method based Galerkin weighted residual technique is used to solve the governing equation. The horizontal walls of the enclosure are kept at constant high temperature while the inclined walls are kept at constant cold temperature. A vertical heated fin is attached to the hot bottom wall with a length at a position from the left surface having thickness . The Prandlt number for the flow inside the enclosure is 0.71. The results of the problem are presented in graphical and tabular forms and discussed. The fin efficiency and temperature distribution were examined. The numerical results indicate the strong influence of the mentioned parameters on the flow structure and heat transfer as well as temperature. A set of graphical results are presented in terms of streamlines, isotherms contour, temperature profiles, velocity profiles, local Nusselt number and average Nusselt number. The obtained results indicated that the heat transfer rate increases with the increase of Rayleigh number in a hexagonal enclosure. The results are validated comparing with the published works.

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Section: Program Validation and Comparison With Previous Worksupporting

confidence: 91%

Section: Program Validation and Comparison With Previous Workmentioning

confidence: 75%

Section: Nusselt Numbermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical Investigation of Natural Convection Flow in a Hexagonal Enclosure Having Vertical Fin

2019

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“…The lighter fluid then moves upwards, and as its temperature decreases, it moves downwards resulting in the recirculation of fluid inside the enclosure. Advancements in the study involved the attachment of projections or roughness elements on either wall to modify the average Nusselt number variation in the enclosure [2][3][4][5][6][7][8]. The flow physics and transfer of heat within the enclosure are interesting and also need to be well understood.…”

Section: Introductionmentioning

confidence: 99%

Design of Macro-rough Surface and Its Influence on Side Wall Heated Square Enclosure

Mahendra¹,

Kumar²

2020

Lecture Notes in Mechanical Engineering

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In the power electronics sector, silicon carbide devices are operational at high junction and case temperatures. Drastic reduction in the size of electronic components including heat sink has been achieved by using silicon carbide rather than silicon. Depending upon the application, the challenges in thermal management can be addressed, preferably passive cooling. If electronic components and its casing have higher operating temperatures, the analysis of natural convection in power electronics is more important. Hence, the present study elucidates the influence of macro-rough surface on natural convection. In this study, a square enclosure with and without macro-roughness have been modelled by maintaining top and bottom walls as adiabatic. The parameters varied are Rayleigh number, number of roughness elements and its thickness. The fluid flow and heat transfer characteristics have been explained with the help of velocity and temperature contours. From the results obtained, we have concluded that the increase in roughness elements and its thickness have reduced convection near the roughness elements.

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Numerical simulation of natural convection heat transfer from a heated square cylinder in a square cavity filled with micropolar fluid

2021

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A numerical investigation has been performed to visualize the magnetohydrodynamic natural convective heat transfer from a heated square cylinder situated within a square enclosure subjected to nonuniform temperature distributions on the left wall. The flow inside the enclosure is unsteady, incompressible, and laminar and the working fluid is micropolar fluid with constant Prandtl number (Pr = 7). The governing equations of the flow problem are the conservation of mass, energy, and linear momentum, as well as the angular momentum equations. Governing equations formulated in dimensionless velocity and pressure form has been solved by Marker and Cell method with second‐order accuracy finite difference scheme. Comprehensive verification of the utilized numerical method and mathematical model has shown a good agreement with numerical data of other authors. The results are discussed in terms of the distribution of streamlines and isotherms and surface‐averaged Nusselt number, for combinations of Rayleigh number, Ra (103–106), Vortex viscosity parameter, K (0–5), and Ha parameter (0–50). It has been shown that an increase in the vortex viscosity parameter leads to attenuation of the convective flow and heat transfer inside the cavity.

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Numerical study of laminar natural convection inside square enclosure with single horizontal fin

Cited by 106 publications

References 25 publications

Numerical Investigation of Natural Convection Flow in a Hexagonal Enclosure Having Vertical Fin

Numerical Investigation of Natural Convection Flow in a Hexagonal Enclosure Having Vertical Fin

Design of Macro-rough Surface and Its Influence on Side Wall Heated Square Enclosure

Numerical simulation of natural convection heat transfer from a heated square cylinder in a square cavity filled with micropolar fluid

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