3 Dimensional CFD analysis of Laminar flow Natural Convection of Hollow Cylinder with Annular Fins

Krishnayatra, Gaurav; Tokas, Sulekh; Kumar, Rajesh; Zunaid, Mohammad

doi:10.11159/htff19.181

Cited by 5 publications

(4 citation statements)

References 11 publications

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“…Therefore, the thermal characteristics of the system are not forming a set pattern. This insufficiency of getting a set sequence is absent for annular fins on the outer surface of the hollow horizontal cylinder [27], the solution of those cases is also possible using analytical relations [26]. This complexity can be assessed by the behaviour of the velocity vectors shown in Figure 18.…”

Section: Resultsmentioning

confidence: 99%

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: Resultsmentioning

confidence: 99%

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 "expected" flow regime in the solved geometry is decided by the use of turbulence models. In the case of natural convection problems, the Rayleigh number Equation 2 determines the flow regime (Bird et al, 2002). One can estimate the value of the Rayleigh number in the case of natural convection around the middle surface of the annulus.…”

Section: Figure 1: Turboprop Engine Cross Section With Simplified Geo...mentioning

confidence: 99%

Investigation of temperature fields during turboprop engine cooling simplified to the 3D double annulus

Pařez,

Tater,

Kovář

2023

European Conference on Turbomachinery Fluid Dynamics and Thermodynamics

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Presented research deals with the phenomenon of natural convection and heat transfer which occurs while the gas turbine cools down after operation. Experimental facilities for measuring temperature field in a double annulus is developed and described in detail. At the base of the experimental facilities is emulated numerical model. Nowadays, there is an effort to minimize radial clearances as it brings the benefit of higher efficiency. On the other hand, it also requires the ability to understand and predict the transient cooling cycle to avoid critical failures. Experimental facilities represent a simplified flow path of double annulus in the section of the generator turbine flow path. The time dependence of the temperature fields were monitored. In addition, the dependence of the temperature differences between each top and bottom double annulus is stated. This is important to determine the thermal bow of the rotor and has a significant impact on the safety and trouble-free operation of the gas turbine engine. A computational study is performed with different geometrical variants. It has been shown that the thermal rotor bow caused by natural convection can be significantly influenced by the variable geometry and additional radial fins in this region. Results of the study have shown several options to optimize mitigate the rotor bow of a gas turbine.

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“…This research has been simplified to a 2D model which does not include the effect of vorticity from natural convection and heat transfer by heat conduction in tubes. In (Padilla and Silveira-Neto [9], Krishnayatra et al [10]) the 3D effect of natural convection is presented.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical study of natural convection in 3D double horizontal annulus

Pařez,

Tater,

Polanský

et al. 2022

EPJ Web Conf.

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Presented paper is focused on numerical simulation of turboprop engine cooling in the section of a gas turbine. The method of heat transfer motor cooling by natural convection and radiation is described. The heat transfer in gas turbine section is represented on a simplified double annular geometry. Numerical data were compared with data that was gained from measuring on an experimental stand. The surface temperatures of the tubes were measured on the experiment stand during the cooling of the engine model. Numerical and experimental results reach a good agreement and will be further applied to the study of temperature-dependent deformation of aircraft engine parts, which have a significant effect on the safety and flawless operation of the aircraft engine.

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3 Dimensional CFD analysis of Laminar flow Natural Convection of Hollow Cylinder with Annular Fins

Cited by 5 publications

References 11 publications

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

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

Investigation of temperature fields during turboprop engine cooling simplified to the 3D double annulus

Experimental and numerical study of natural convection in 3D double horizontal annulus

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