A three dimensional numerical study on natural convection heat transfer from short horizontal rectangular fin array (original) (raw)
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Parametric study of natural convection heat transfer from horizontal rectangular fin arrays
International Journal of Thermal Sciences, 2000
A systematic theoretical investigation of the effects of fin spacing, fin height, fin length and temperature difference between fin and surroundings on the free convection heat transfer from horizontal fin arrays was carried out. The three-dimensional elliptic governing equations were solved using a finite volume based computational fluid dynamics (CFD) code. Preliminary simulations were made for cases reported in the literature. After obtaining a good agreement with results from the literature a large number of runs were performed for a detailed parametric study. It has been shown that it is not possible to obtain optimum performance in terms of overall heat transfer by only concentrating on one or two parameters. The interactions among all the design parameters must be considered. Results are presented in graphical form together with optimum values and correlations, and compared with available experimental data from the literature.
ow Aspect Ratio on Convective Heat Transfer from Rectangular Fin Array in Natural Convection
Experimental and CFD analysis is conducted in order to establish effect of geometrical fin parameters for natural convection heat transfer from vertical rectangular fin arrays.Natural convective heat transfer from rectangular vertical plates has been reviewed. Study revealed that most of the work was carried out considering various configurations. Experimental work carried on steady state natural convection heat transfer from vertical rectangular fins made of aluminum. Experimental work carried investigates the effect of fin spacing, fin height, fin length on the performance of heat dissipation from the fin arrays. It is found that convection heat transfer rate depends on fin height and fin length. For a given fin spacing, the convection heat transfer rate from fins increases with fin height. For a given fin spacing, the convection heat transfer rate from fins increases with fin length .This trend is observed for every fin configuration. It is found that convection heat transfer rate is more for less aspect ratio fin array for same power input.
Heat transfer enhancement is the major research area in which many researchers are working to fulfill the need heat exchangers having high heat transfer abilities. This work consists of the study of heat transfer enhancement rectangular fin array at different inclinations. In this work angle of inclination of the fin array has been maintained at 0 0 , 30 0 , 45 0 , 60 0 and 90 0. This work is conducted for the experimental analysis of heat transfer from Rectangular fin array at different inclinations by natural convection. In this work fin arrays with different angles of inclinations are tested and their results are studied to find out their effect on the heat transfer from fin array. The results of this study shows that with change in angle of inclinations the heat transfer coefficient and the Nusselt number also changes. At 0 0 inclinations both the heat transfer coefficient and the Nusselt number has lowest magnitudes in entire study. At 45 0 inclinations both the heat transfer coefficient and the Nusselt number has highest values.
Natural convection from an array of horizontal rectangular thick fins with short length
Applied Thermal Engineering, 2008
In this article numerical study is made to predict natural convection from an array of aluminum horizontal rectangular thick fins of 3 mm < t < 7 mm with short lengths (L 6 50 mm) attached on a horizontal base plate. The three-dimensional elliptic governing equations of laminar flow and heat transfer were solved using finite volume scheme. For 128 fin geometries, typical results have been compared with available experimental data from the literature and good accuracy were observed. Based on the verified model, fluid flow and thermal structure around various fins were illustrated and two types of flow patterns in the channel of the fin arrays were observed. Effect of various fin geometries and temperature differences on the convection heat transfer from the array was determined for Rayleigh numbers based on fin spacing of 192-6784 and applied correlations are developed to predict Nusselt numbers with corresponding non-dimensional parameters.
Heat Transfer Analysis through Fin Array by Using Natural Convection
2012
The main purpose of extended surfaces called fins to increase the heat transfer rate. Fins offer an economical and trouble free solution in many situations demanding natural convection heat transfer. Heat sinks in the form of fin arrays on horizontal and vertical surfaces used in variety of engineering applications, studies of heat transfer and fluid flow associated with such arrays are of considerable engineering significance. The main controlling variable generally available to designer is geometry of fin arrays. Considering the above fact, natural convection heat transfer from vertical rectangular fin arrays with and without notch at the center have been investigated experimentally and theoretically. Moreover notches of different geometrical shapes have also been analyzed for the purpose of comparison and optimization. In a lengthwise short array where the single chimney flow pattern is present, the central portion of fin flat becomes ineffective due to the fact that, already heated air comes in its contact. Many researchers have been studied the heat transfer rate through without notch and notched fins by using aluminum as a material. Verities of researchers were carried out, this paper focuses on heat transfer rate of copper fin for greater heat transfer rate which is need of increased rate of modernization thus extent of copper is tested. I.
2014
A systematic experimental investigation of the fin spacing for the given fin height, fin length , for the width of array and heat input on free and forced convection heat transfer from horizontal fin array was carried out. A horizontal rectangular fin array with aluminum fin and aluminum spacer is constructed in which the distances between the fins are varied with adding or removing the spacers of different thickness between the fins. The objective of this experimentation is to determine the optimum spacing in which the maximum heat transfer is taking place by natural and forced convection at different heat input and at different wind velocity.
2014
In this article an experimental investigation is made to predict the performance of heated triangular fin array within a vertically oriented and air filled rectangular enclosure. The experimental analysis is done to analyze the effects of several influencing parameters for their wide ranges; Rayleigh number 295214 ≤ Ra ≤ 773410, fin spacing 25 mm ≤ S ≤ 100 mm and fin height 12.5 mm ≤ L ≤ 37.5 mm for constant heat flux boundary conditions at the heated and cooled walls of the enclosure. An empirical correlation is also developed relating Nusselt number to several influencing parameters.
Enhancement of Natural Convection Heat Transfer from Horizontal Rectangular FIN Arrays : A Review
In this study, various fin geometries are referred for steady-state natural convection heat transfer. The effects of fin spacing, fin length, fin height, % of perforations, shape of perforations etc. are studied. For high powered street LED lights heat sinks with horizontal fin arrays are utilized. Large amount of heat generated in these street LED " s must have to be dissipated effectively, so that the life span of the same can be enhanced. For the heat sinks currently utilized in the high powered street LED " s a stagnation zone is formed at the symmetry centre of the fins this causes the problem in air circulation ultimately affects the heat dissipation capacity of the heat sink. Therefore there should be the proper provision for air to be drawn.
Computational Investigation on Natural Convection Heat Transfer in Vertical Plate Fin Arrays
Indian Journal of Science and Technology, 2021
Objectives: To perform computational studies on different combinations of plate fin arrays of different shapes for studying their performance in natural convection heat transfer. To compare the heat transfer performance of uniform notched fins with hybrid notched fins and also performance of normal notched fins with inverted notched fins. Methods: SolidWorks Flow Simulation software is used for the present computational studies. Three types of vertical plate fin arrays viz. plain rectangular fin, rectangular fin with square notch and rectangular fin with semi-circular notch are used with their seven combinations. These fin array combinations are: plain rectangular, rectangular square notched, rectangular semi-circular notched, rectangular inverted square notched, rectangular inverted semi-circular notched, hybrid rectangular square-semi-circular notched and hybrid rectangular inverted square-semi-circular notched. Findings: The highest average heat transfer coefficient of 7.82 W/m 2 K is found to be for inverted hybrid square-semicircular notched fin array. This value of heat transfer coefficient is about 8% higher than compared to that with plain rectangular plate fin array (7.25 W/m 2 K) subjected to same operating conditions. Average heat transfer coefficients for inverted plate fin array combinations are high as compared with the non-inverted combinations. Also, hybrid plate fin arrays, whether inverted or not, show higher heat transfer coefficient values as compared with uniform notched fin arrays. Novelty : Seven types of plate fin array combinations are studied computationally. SolidWorks Flow Simulation software is used very effectively for this 3D CFD analysis. The behaviour of fluid i.e. air during natural convection flow is studied using air flow velocity trajectories. Surface contours are effectively used for studying variation in surface temperature and heat transfer coefficient at all locations of fin arrays.
Materials Today: Proceedings, 2021
Heat transfer by free convection from fin array is influenced by modification in size and shape of the fins as well as interruption in fluid flow. The objective of heat sink is the thermal management of electronic devices by removing excessive heat and improve the lifespan of the device. The paper investigates the thermal performance of free convection heat transfer with vertical heat sink by providing slits along the vertical surface of the fins. For the evaluation purpose two different arrangements viz. plain fin and slitted fin are selected. Fins are made from high thermal conductivity aluminium material and five dissimilar heat inputs are selected for study. The experimental and numerical findings are confirmed using the theoretical correlations available from the literature. The effect of number of slits and width of slits is investigated on convective heat transfer coefficient. Numerical study is used to understand the flow patterns around the vertical fin surface. It has been observed that the presence of slits on the surface appreciably improves the thermal performance of vertical fin array.