DOI: http://dx.doi.org/10.14741/ijcet/spl.2.2014.20 109 | International Conference on Advances in Mechanical Sciences 2014 Research Article International Journal of Current Engineering and Technology E-ISSN 2277 – 4106, P-ISSN 2347 - 5161 ©2014 INPRESSCO ® , All Rights Reserved Available at http://inpressco.com/category/ijcet Thermal Analysis of Square and Circular Perforated Fin Arrays by Forced Convection Kavita H. Dhanawade Ȧ* , Vivek K. Sunnapwar Ȧ and Hanamant S. Dhanawade Ḃ Ȧ Lokmanya Tilak College of Engineering, Dept. of Mechanical Engineering, Navi Mumbai, India Ḃ Smt. Indira Gandhi College of Engineering Dept. of Mechanical Engineering, Navi Mumbai, India Accepted 07 January 2014, Available online 01 February 2014, Special Issue-2, (February 2014) Abstract Heat dissipation is a drastic issue to tackle due to continued integration, miniaturization, compacting and lightening of equipment. Heat dissipaters are not only chosen for their thermal performance; but also for other design parameters that includes weight, cost and reliability, depending on application. The present paper reports an experimental study to investigate the heat transfer enhancement over horizontal flat surface with rectangular fin arrays with lateral square and circular perforation by forced convection. The cross sectional area of the rectangular duct was 200 mm x 80 mm. The data used in performance analysis were obtained experimentally for fin arrays of material aluminum, by varying geometry and size of perforation as well as by varying Reynolds number from 2110 4 to 8.710 4 . It is observed that the Reynolds number and size perforation have a larger impact on Nusselt number for the both type of perforations. Keywords: Heat transfer enhancement, fin arrays, perforated fins, forced convection. . 1. Introduction 1 The enhancement of heat transfer is an important subject of thermal engineering. The removal of excessive heat from system components is essential to avoid the damaging effects of burning or overheating. The heat transfer from surface may, in general, be enhanced by increasing the heat transfer coefficient between a surface and its surrounding, or by increasing heat transfer area of the surface, or by both. Extended surfaces that are well known as fins are commonly used to enhance heat transfer in many industries. Various types of fins like rectangular plate fins, square pin-fins and circular pin-fins are commonly used for both natural and forced convection heat transfers. (Ugur and Kadir, 2006) conducted an experiment to investigate the heat transfer and friction loss characteristics in a horizontal rectangular channel having attachments of hollow rectangular profile fins. They studied in-line and staggered fin arrangements for one- fixed spanwise and four different streamwise distances. They also found correlation equations for Nusselt number and friction factor. (Souidi and Bontemps, 2001) studied countercurrent gas-liquid flow in narrow rectangular channels simulated by plain and perforated fins. They observed different flow patterns depending on fluid flow rates. (AIEssa, et al, 2004,2008,2009,20012) studied the heat dissipation from a horizontal rectangular fin embedded with square perforation, rectangular perforations with aspect ratio of two, equilateral triangular perforations of bases parallel and towards its fin tip, by *Corresponding author: Kavita H. Dhanawade using finite element technique under natural convection. They compared the results of the perforated fin with its external dimensionally equivalent solid fins. They showed that perforation in the fins enhances heat dissipation rates. Also, the heat transfer of perforated fin enhances with increase in the fin thickness. Suryawanshi and Sane (2009) investigated experimentally the heat dissipation from fin array with inverted notch at the central bottom portion of fin to modify its geometry for enhancement of heat transfer on normal and inverted notched fin arrays (INFAs). They found that the average heat transfer coefficient for INFAs is nearly 30–40% higher as compared to normal array. (Sara, et al,2000,2001) investigated the thermal performance of solid and perforated rectangular blocks attached on a flat surface in a rectangular duct. When the blocks were perforated, loss in the net energy was recovered and depending on the geometrical and flow conditions, a net gain in energy, up to 20% was achieved. They also found that a perforation in the blocks enhances the heat transfer and enhancement increases with the increasing degree of perforations. (Bayram, et al, 2008) experimentally investigated the overall heat transfer, friction factor and the effect of the various design parameters on the heat transfer and friction factor for the heat exchanger equipped with square cross- sectional perforated pin fins and circular cross section perforated pin fins in a rectangular channel. They found that the Nusselt number that is based on the projected area would reflect of the variation in the surface area as well as that of the disturbance in the flow due to pin fins on the heat transfer. (Rahman, et al, 2005) have studied numerically as well as experimentally heat transfer