Numerical investigation for a hyperbolic annular fin with temperature dependent thermal conductivity

The numerical examination of radiation and natural convection in a porous radial fin along with varying internal heat generation with respect to temperature is carried out in the current study. The aim of this study is to scrutinize the heat transfer phenomenon in fin wetted with water-based carbon nanotubes like single-walled carbon nanotubes and multiwalled carbon nanotubes. In the proposed work, the Darcy’s model is employed for the analysis. The modeled equations are nondimensionalized and solved by utilizing Runge–Kutta–Fehlberg method. The impact of relevant parameters on the heat transfer rate is comprehensively explored with an aid of graphs. Here, multiwalled carbon nanotube–water shows better heat transfer from surface of fin compared to single-walled carbon nanotube–water.

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“…Darvishi et al. 15 examined the hyperbolic profiled radial fin with varying thermal conductivity by using pseudo spectral method.…”

Section: Introductionmentioning

confidence: 99%

Thermal exploration of radial porous fin fully wetted with SWCNTs and MWCNTs along with temperature-dependent internal heat generation

Sowmya

Gireesha

Sindhu

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Mosayebidorcheh et al 23 presented the optimization of longitudinal fins of different shapes and materials associated with temperature‐dependent phenomena. Darvishi et al 24 numerically investigated the hyperbolic annular fin with temperature‐dependent conductivity. Functionally graded longitudinal fin was analyzed by Khan and Aziz 25 .…”

Section: Introductionmentioning

confidence: 99%

Inverse and efficiency of heat transfer convex fin with multiple nonlinearities

Roy

Mondal

Mallick³

et al. 2020

Heat Trans

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In this article, we first propose the novel semianalytical technique-modified Adomian decomposition method (MADM)-for a closed-form solution of the nonlinear heat transfer equation of convex profile with singularity where all thermal parameters are functions of temperature. The longitudinal convex fin is subjected to different boiling regimes, which are defined by particular values of n (power index) of heat transfer coefficient. The energy balance equation of the convex fin with several temperaturedependent properties are solved separately using the MADM and the spectral quasi-linearization method. Using the values obtained from the direct heat transfer method, the unknown parameters of the profile, such as thermal conductivity, surface emissivity, heat generation number, conductionconvection parameter, and radiation-conduction parameter are inversely predicted by an inverse heat transfer analysis using the simplex search method. The effect of the measurement error and the number of measurement points has been presented. It is found that present measurement points and reconstruction of the exact temperature distribution of the convex fin are fairly in good agreement.

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“…They presented a two-dimensional analytical solution for a fin under constant base temperature and the uniform thermal conductivity coefficient around the fin. Among other research that studied the temperature distribution and thermal stress in the annular fins, it can be mentioned to references [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of thermal stresses and strains of annular finned tube bundle in turbulent flow regime

Hatami

Payan

Hosseini

2020

Mechanics & Industry

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In this paper, the effect of turbulent flow on the thermal stresses and strains created in an annular finned-tube bundle is studied. The finite volume method and the transition SST model, along with the SIMPLE algorithm, are used to solve the flow equations, and the finite element method is used to solve the thermal stress equations in solid. The results obtained from the effective stress and strain in the annular fins bundle show that despite the temperature difference of less than 1 degree between the base and the edge of the fin, the amount of thermal stresses cannot be ignored and the asymmetric distribution of temperature in the fins leads to the shear stresses which play a key role in determining the maximum position of the effective stresses in some rows. The results show that the amount of effective stress and strain in the third and fourth rows are significantly smaller than the first and second rows. The results also show that the highest amount of the effective stress occurs in the first row and the fin base at zero-degree angle, the value of which is 0.6 MPa. The predominance of the tangential stresses at the fin base in this row is the cause of this issue. However, in the second fins onwards, although the tangential stresses are still higher, the greater asymmetry of the temperature around the fins in these rows leads to comparability of the shear stresses with tangential stresses and creates the maximum effective stress at angles other than zero degree. Therefore, according to the results of this paper, the analysis of the flow around the annular fins is necessary to calculate thermal stress and strains and it determines the vulnerable points in each tube row. It is natural that with increasing temperature difference between the base and the edge of the fin and with increasing fin hight, the importance of these studies increases.

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Numerical investigation for a hyperbolic annular fin with temperature dependent thermal conductivity

Cited by 29 publications

References 31 publications

Thermal exploration of radial porous fin fully wetted with SWCNTs and MWCNTs along with temperature-dependent internal heat generation

Thermal exploration of radial porous fin fully wetted with SWCNTs and MWCNTs along with temperature-dependent internal heat generation

Inverse and efficiency of heat transfer convex fin with multiple nonlinearities

Numerical analysis of thermal stresses and strains of annular finned tube bundle in turbulent flow regime

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