Comparative Analysis of Free Natural Convection Heat Transfer on Rectangular and Triangular Fins with and without Perforation (original) (raw)
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Effect of the fins configuration on natural convection heat transfer experimentally and numerically
2015
The cooling of the electronic systems, electrical systems, and CPU of the computer is very important; therefore this study is prepared to improve this aims. In this study, natural convection heat transfer from rectangular fins with five different figures (continuous fins, 1-interrupted fins, 4-interrupted fins, inclined fins and V-fins) are investigated at different heat flux values (175, 350, 525, 700 and 875 Watt per square meter).The effect of base to ambient temperature difference for continuous fins, 1-interrupted fins, 4interrupted fins, inclined fins and V-fins were determined. All types of the fins are made with different geometries by using CNC machine and wire cut machine, but it have some dimensions in common such as fins thickness (5)mm, fins height (18)mm, space between the fins (10)mm, and the volume of the base plat of heat sink (300*95*2)mm. The heat sink base plate was heated by an attached maximum electric heater 2225 W/m 2 with an identical size with the base plat...
Experimental Study of the Perforated Rectangular Fins by Natural Convection
The importance of heat transfer by natural convection can be found in many engineering applications, such as energy transfer in buildings, solar collectors, nuclear reactors and electronic packaging. This study examined heat transfer enhancement from a vertical rectangular fin embedded with circular perforations under natural convection compared to the equivalent solid (non perforated) fin. The parameters considered were geometrical dimensions and thermal properties of the fin and of the perforations. The study considered the gain in fin area and extent of heat transfer enhancement due to perforations. It showed that for circular dimension perforations there is an improvement in perforated fin heat dissipation over that of the equivalent non perforated solid fin.
THE IRAQI JOURNAL FOR MECHANICAL AND MATERIALS ENGINEERING, 2018
An experimental study was done to investigate the effect of fin geometrymodification and material type on heat dissipation from a heat sink under natural convection.v-corrugated solid fin and v-corrugated perforated fin were designed for this purpose.Aluminum and Copper metals were selected in designing the fins because their wideapplication in cooling and heating equipment. Three different voltages 110, 150 and 200 Vsupplied to the heat sink to study their effects on the fins performance. Each experimentrepeats two times to reduce the error and the data recorded after reaching the steady stateconditions. The utilization of solid and perforated v-corrugated fins is compared. The resultsshowed that perforated fins dissipated heat more than corresponding solid by 15.4, 34 and32% for aluminum, and 2.7, 2.1 and 4.3% for copper fin in the three voltages. Also, theresults indicated that the heat loss by solid copper fin is greater by 56, 72 and 92% thancorresponding solid aluminum fin and...
Numerical investigation on heat transfer enhancement by Natural Convection with Perforated Fins
IJRAR, 2018
The main objective of this study is to quantify and compare the natural convection heat transfer enhancement of different geometries, perforation number (0, 1 and 3) and angle (0 0 and 12 0) of perforated fins. In this paper different geometries of fins like circular, square and cylindrical tapered were designed by considering the material volume as a constraint, The steady state heat transfer from the solid fins and perforated fins of different geometries were measured at different heat inputs, and were simulated by varying number of perforations and angle of perforations using CFD solver. The first part of the investigation suggested the benefits of tapered fin performance. In the second part the increase in heat transfer coefficient was observed with increase in number of perforations. Finally the significant change in thermal performance was observed at 12 0 perforated angles.
Among heat transfer augmentation techniques, passive cooling technique found more suitable for electronic cooling than active technique. In this paper, natural convection heat transfer analysis through rectangular fins is reviewed. Various experimental studies have been made to investigate effect of fin height, fin spacing, fin length and fin thickness over convective heat transfer. Effects of thermodynamic properties like heat input, base-to-ambient temperature difference are also studied by many researchers. Some investigators make known sets of correlations screening the relation between various parameters of heat sink. Experiments are taken by some researchers for upward and downward facing rectangular fins. Also, trivial investigation has been carried out for different angle of inclination of the heat sink. The sensitivity of inclination over geometric parameters found to be great importance.
DETERMINATION OF THE TEMPERATURE DISTRIBUTION THE PERFORATED FINS UNDER NATURAL CONVECTION
This work treats the problem of heat transfer for perforated fins under natural convection. The temperature distribution is examined for an array of rectangular fins (15 fins) with uniform cross-sectional area (100x270 mm) embedded with various vertical body perforations that extend through the fin thickness. The patterns of perforations include 18 circular perforations (holes). Experiments were carried out in an experimental facility that was specifically design and constructed for this purpose. The heat transfer rate and the coefficient of heat transfer increases with perforation diameter increased.
International Journal of Engineering Research and Technology (IJERT), 2015
https://www.ijert.org/experimental-analysis-between-rectangular-solid-fins-with-different-circular-perforated-rectangular-fins-under-natural-convection https://www.ijert.org/research/experimental-analysis-between-rectangular-solid-fins-with-different-circular-perforated-rectangular-fins-under-natural-convection-IJERTV4IS050796.pdf The heat transfer rate from a solid horizontalrectangular fin and fins with of same geometrical dimension embedded with different number of same circular perforations under natural convection is numerically investigated. The parameters considered in this investigation are the geometrical dimension of fins, perforationdimension of fins with different number of same circular perforation. A comparison between heat transfer rates of the solid fin with different number of the circular perforated finsis presented. It is found that the heat transfer rate of solid horizontal rectangular fin is low as compared to different number of circular perforated fin and the lateral spacing between perforation decreases which increases heat transfer coefficient. Here in this experimental analysis of fins we compute the three different value of heat transfer coefficient lies on three different places first one is on flat perforated surface h ps ,second one is on fin tip h t , thirdly at inner perforated surface of perforation h pc , here (h ps ≠h pc ≠h t) for computing the value of total heat transfer rate of each fin to get the overall effectiveness of the fin. The problem of this study was numerically solved and results are plotted through mat lab software.
2016
The main objective of this study is to understand the effect of number of perforations on convective heat transfer experimentally investigated. Perforations in the fins are one way that used to improve its effectiveness. In this study, the steady state heat transfer from the solid fin and perforated fin arrays are measured. The temperature drop along the perforated fin length is consistently higher than that for the equivalent non-perforated fin. The inlet temperature of the cylinder core was in the rage of 353 o C-953 o C for voltage range 100 V to 220 V. The heat transfer depends on the porosity of the fin. Heat dissipation rate is increased in the range of 20% to 70% with increase in the number of perforations (24 to 60) up to certain level. If further increase in perforation numbers this leads to reduction of the heat dissipation from the fin.