Exploration of the effects of fin geometry and material properties on thermal performance of convective-radiative moving fins (original) (raw)
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Thermal performance of different types of fins using convective heat transfer
Journal of Thermal and Fluid Science, 2020
Abstract-This research examines the efficiency of various fin forms and includes heat transfer rate analysis. For analysis, four distinct fins are employed. Fins come in a variety of shapes, including round, square, hexagonal, and rectangular. The goal is to figure out how much heat is exchanged and how efficient a similar region with a different shape is. The goal of the research is to determine the maximum heat transfer from the fin surface as well as the efficiency of different fin shapes. The steady-state thermal analysis using ANSYS 14.5 is utilized for this investigation. Heat is transferred from a solid rod to a solid fin. Convection occurs with air flowing through a duct at the same time. The fin is used to mount a nichrome (band type) heater for heat delivery. The fins on the heater are composed of aluminum, which has a higher thermal conductivity than other materials. The solid work programme generates fin models, which are then loaded into ANSYS 14.5. The investigation is carried out in a systematic manner. Lay out the experimental setup first, then obtain individual readings from various shaped fins. The heat transfer rate and efficiency are estimated from the recorded readings for various Reynolds' Numbers, and the results are then compared to other fins. .
Applied and Computational Mechanics, 2018
In this study, thermal performance across straight convecting- radiating fin with temperature dependent thermal conductivity is considered. The variation of parameters (VPM) is adopted to analyze the nonlinear higher order differential equations arising due to thermal conductivity and heat transfer coefficient on temperature distribution. Pertinent parameters such as thermo geometric and radiation parameters effect on temperature profile are investigated. Result obtained illustrates that quantitative increase of thermo geometric parameter causes a significant increase in temperature distribution due to increase in ratio of convective to conduction heat transfer which influence is significant toward fin base while increasing radiation parameter leads to decrease in temperature distribution due to increasing heat transfer from fins surface to ambient environment . Comparative analysis of result obtained in study against literature proves to be in satisfactory agreement. Therefore stud...
Efficiency Analysis of Straight Fin with Variable Heat Transfer Coefficient and Thermal Conductivity
Springer Link, 2012
In this study, one type of applicable analytical method, differential transformation method (DTM), is used to evaluate the efficiency and behavior of a straight fin with variable thermal conductivity and heat transfer coefficient. Fins are widely used to enhance heat transfer between primary surface and the environment in many industrial applications. The performance of such a surface is significantly affected by variable thermal conductivity and heat transfer coefficient, particularly for large temperature differences. General heat transfer equation related to the fin is derived and dimensionalized. The concept of differential transformation is briefly introduced, and then this method is employed to derive solutions of nonlinear equations. Results are evaluated for several cases such as: laminar film boiling or condensation, forced convection, laminar natural convection, turbulent natural convection, nucleate boiling, and radiation. The obtained results from DTM are compared with the numerical solution to verify the accuracy of the proposed method. The effects of design parameters on temperature and efficiency are evaluated by some figures. The major aim of the present study, which is exclusive for this article, is to find the effect of the modes of heat transfer on fin efficiency. It has been shown that for radiation heat transfer, thermal efficiency reaches its maximum value.
Heat Transfer Analysis and Optimization of Fins by Variation in Geometry
2017
The main aim of the project is to analyze the thermal heat dissipation of fins by varying its geometry. Parametric models of fins have been developed to predict the transient thermal behavior. There after models are created by varying the geometry such as rectangular, circular, triangular and fins with extension. The modeling software used is CREO Parametric 2.0. The analysis is done using ANSYS 14.5. Presently Material used for manufacturing fin body is generally Aluminium Alloy 204 which has thermal conductivity of 110-150W/m-0C. We are analyzing the fins using material Aluminium Alloy 6061 which has higher thermal conductivity of about 160-170W/m-0C. After determining the material the third step is to increase the heat transfer rate of the system by varying geometrical parameters such as cross sectional area, parameter, length, thickness, e.t.c. which ultimately leads us to fins of varying shape and geometries.
Journal of Central South University of Technology
A simple and highly accurate semi-analytical method, called the differential transformation method (DTM), was used for solving the nonlinear temperature distribution equation in solid and porous longitudinal fin with temperature dependent internal heat generation. The problem was solved for two main cases. In the first case, heat generation was assumed variable by fin temperature for a solid fin and in second heat generation varied with temperature for a porous fin. Results are presented for the temperature distribution for a range of values of parameters appearing in the mathematical formulation (e.g. N, ɛ G , and G). Results reveal that DTM is very effective and convenient. Also, it is found that this method can achieve more suitable results in comparison to numerical methods.
Finite Element Analysis of Thermal Characteristics of Annular Fins with Different Profiles
2012
The selection of a particular fin configuration in any heat transfer application depends on the space, weight, manufacturing technique and cost considerations as well as the thermal characteristics it exhibits. Radial or annular fins are one of the most popular choices for enhancing the heat transfer rate from the primary surface of cylindrical shape. Different profiles have profound influence on the thermal characteristics of annular fins. In the present study, a detailed work has been carried out to develop a finite element methodology to estimate the temperature distribution for steady-state heat transfer and thermal stresses induced by temperature difference in a silicon carbide (SiC) ceramic finned-tube of the heat transfer equipment. Finite element method (FEM) was used to compute the temperature and the stress fields. An extensive study was carried out using ANSYS, a powerful platform for finite element analysis. Results obtained were presented in a series of temperature and ...
Energy Conversion and Management, 2013
In this study, heat transfer and temperature distribution equations for circular convective-radiative porous fins are presented. It's assumed that the thickness of circular fins varies with radius so four different shapes, rectangular, convex, triangular and exponential, are considered. The heat transfer through porous media is simulated using passage velocity from the Darcy's model. After deriving equation for each geometry, Least Square Method (LSM) and fourth order Runge-Kutta method (NUM) are applied for predicting the temperature distribution in the porous fins. The selected porous fin's materials are Al, SiC, Cu and Si 3 N 4. Results reveal that LSM has very effective and accurate in comparison with the numerical results. As a main outcome, Si 3 N 4-exponential section fin has the maximum amount of transferred heat among other fins.
World Scientific News, 2020
Investigation on thermal responses of different materials subjected to variant environmental condition has been a subject of ever-increasing research interest for decades. As such, research studies have shown different materials exhibiting peculiar characteristics of commercially used heat enhancement devices. Therefore, this work presents an investigation on thermal behaviour of a convective porous moving fins with temperature dependent thermal conductivity for five different materials. These materials include copper, Aluminium, Silicon nitride, Silicon carbide and Stainless steel. A hybrid method, viz-Laplace-variational iterative method (LVIM) is used to solve the model equation developed. And a perfect agreement is achieved when the result obtained from LVIM is verified with the exact solution. The result obtained shows that silicon carbide compete favourably with copper as the most efficient material in heat enhancement, while stainless steel shows the least performance. It is hoped that this work will serve as a template and a helpful tool for both scientist and engineers' in future design of fins.
Investigation of the effect of aluminum porous fins on heat transfer
Energy, 2017
In the present study, heat transfer and pressure drop characteristics of aluminum porous fins mounted on a surface in a rectangular channel were studied. Nusselt number, heat transfer enhancement ratio and heat transfer performance for three gap heights over pore fins (C/H=0, 0.5 and 1) as well as three longitudinal fin pitches (S x =116, 126 and 136 mm) were investigated for the range of 5000 < Re < 35000. It was found that use of larger gap height over fins has a significant effect on the Nusselt number while the longitudinal fin pitch has a negligible influence on it. The highest heat enhancement ratio (Nu*) was obtained as 470-660% for the case of C/H=0 and S x =136 mm. Furthermore, the highest heat transfer performance (η) was in the range of 1.7-2.6 for the case of C/H=1 and S x =136 mm. The highest heat enhancement ratio (Nu*) was obtained for C/H=0 and S x =136 mm while the highest heat transfer performance (η) was obtained for C/H=1 and S x =136 mm. In conclusion, the heat transfer performances (η) studied are advantageous for all fin and channel arrangements, since heat transfer performances (η) for all present tests are higher than unity.