Conjugate Natural Convection Heat Transfer From a Horizontal Cylinder With a Long Vertical Longitudinal Fin

Kwon, S. S.; Kuehn, Thomas H.

doi:10.1080/01495728308963076

Cited by 29 publications

(3 citation statements)

References 18 publications

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“…At the air-fin interface, the coupled boundary condition is used in order to maintain the continuity of heat and temperature T so = T fl (9) Since the flow is buoyancy driven, air enters and leaves from the outer surface of the cylindrical domain of air considered, thus it is subjected to pressure outlet boundary condition. (10) The thermo-physical properties of air taken for this study is at the mean bulk temperature (T w + T ∞ )⁄2 = T b = 300 K.…”

Section: Governing Equations and Boundary Conditionsmentioning

confidence: 99%

“…Where N is the number of fins on the outer periphery of the tube. The heat transfer coefficient can be calculated from Equation (10) and Nusselt number, which can be explained as the enhancement of heat transfer coefficient when a fluid is flowing with respect to still fluid. based on the outer diameter of the tube can be written as…”

Section: Other Parametersmentioning

confidence: 99%

“…Finite Difference Method (FDM) discretization was broadly used to numerically solve the governing equations, however, as the technology advanced the drawbacks begin to come in the picture. Kwon and Kuehn [10] numerically solved conjugate heat transfer laminar natural convection from a solid isothermal cylinder with one infinitely long vertical plate-fin and developed various correlations to previse both local and total heat transfer rates from the cylinder. Tolpadi and Kuehn [11] used finite-difference technique to perform three-dimensional parametric study for a transversely finned horizontal cylinder under natural convection and concluded that for a particular material and thickness of fin, an optimum number of fins exist where the total heat transfer maximizes.…”

Section: Introductionmentioning

confidence: 99%

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Parametric study of natural convection showing effects of geometry, number and orientation of fins on a finned tube system: A numerical approach

KRISHNAYATRA

TOKAS

KUMAR

et al. 2022

Journal of Thermal Engineering

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The present study provides a thorough numerical analysis of natural convection heat transfer from a horizontal cylinder with external longitudinal fins. The Three-dimensional(3D) forms of Continuity, Navier-stokes, and the energy equations have been solved to understand the flow field and temperature distribution using the Ansys Fluent software. The purpose of the study is to investigate the effects of fin length L f , fin thickness (t), number of fins (N) and material of fin (Aluminum & Steel) on the parameters namely, the heat transfer rate from the inner isothermal wall and effectiveness (Q*)of the system for a constant Rayleigh number in the laminar range (Ra ≤ 10 6 ). Additionally, the effect of two different orientations (A&B) of fins has been discussed. Orientation-A consists of fins starting from horizontal plane placed at equal angular spacing subsequently, whereas the fins in orientation-B originate from the vertical plane followed with equal angular spacing. Non-dimensional fin length (L*) is being varied from 0.222 to 2, non-dimensional fin thickness (t*) as 0.022 ~0.044 and the number of fins (N) between 6~24. It is observed that for a fixed number of fins there exists an optimum fin length and for a fixed fin length there exists an optimum fin thickness & an optimum number of fins. For a fixed number of fins there exist an optimum fin length and maximum effectiveness, the maximum possible effectiveness for the taken fin-tube system is 4.34 for 12 fins. Th e ma ximum effectiveness rep orted in the cur rent stu dy was 1.86 for L*=0.444, t*=0.022 and N=12. Furthermore, the optimum length for N=12 came out to be L*=1.8.

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Section: Governing Equations and Boundary Conditionsmentioning

confidence: 99%

Section: Other Parametersmentioning

confidence: 99%