STEADY STATE THERMAL ANALYSIS OF HEAT SINK WITH FINS OF DIFFERENT GEOMETRY

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1 International Journal of Mechanical Engineering and Technology (IJMET) Volume 8, Issue 5, May 2017, pp Article ID: IJMET_08_05_019 Available online at ISSN Print: and ISSN Online: IAEME Publication Scopus Indexed STEADY STATE THERMAL ANALYSIS OF HEAT SINK WITH FINS OF DIFFERENT GEOMETRY V Naga Raju, P. Sivakumar Asst. Professors, Dept. of Mechanical Engineering, K L University, Vaddeswaram, Andhra Pradesh K Lakshmi Narayana, A Srujan, K Mallikarjun, G Krishna Dept. of Mechanical Engineering, K L University, Vaddeswaram, Andhra Pradesh, ABSTRACT Finned Heat Sinks are used to cool power Electronic Components.We analyzed the effect of Pin-fin Shapes on performance of Heat Sink in this Paper. We had Performed Steady State Thermal Analysis on different types of fins they were Rectangular fins, Circular fins, Triangular fins, and Interrupted Rectangular fins. We had determined Temperature Distribution, Total Heat flux, directional heat flux. Key words: Heat Sink, Steady State Thermal Analysis. Cite this Article: V Naga Raju, P.Sivakumar, K Lakshmi Narayana, A Srujan, K Mallikarjun and G Krishna, Steady State Thermal Analysis of Heat Sink with Fins of Different Geometry, International Journal of Mechanical Engineering and Technology, 8(5), 2017, pp INTRODUCTION Heat Sink gives excess heat a place to go. Appropriately sized heat sinks maintain the semiconductor junction temperature at or lower than the maximum allowable temperature. Heat Sink is used in a place where the elements turn out heat. The elements that turn out the most heat is the Processor. (CPU) and GPU in your computer. Heat Sinks are conventionally used in various industrial purposes to cool electronic, Power electronic, telecommunication and automotive elements, those elements might be either high power semi conductor devices, audio amplifiers, microcontrollers and micro processors. Other elements that may have heat sink include the north bridge, south bridge, and the memory. It is also editor@iaeme.com

2 V Naga Raju, P.Sivakumar, K Lakshmi Narayana, A Srujan, K Mallikarjun and G Krishna not the unconventional to also find fins to help Cool other expansion cards and hard drives in the computer. Without heat sinks, modern Computers could not read at that speed as they do. But what accurately is a heat sink and how does it work? Just put, a heat sink in an object that disperses heat from another object. They're most frequently used in computers, but are also found in Mobiles and Disc players and even refrigerators. In a Computer heat sink is used as a connection for the chip to prevent producing more amount of heat. 2. OBJECTIVES OF PRESENT WORK To design heat sink by varying geometry such as rectangular, circular, triangular, interrupted rectangular fins. To determine Steady state thermal properties of different geometries. Finally compare the results of heat transfer by fins. 3. ANALYSIS BY ANSYS The ANSYS Multi physics, ANSYS Mechanical, ANSYS FLOTRAN, and ANSYS Professional products support steady- state thermal analysis. A Steady -state thermal analysis calculate the effects of steady thermal loads on a system or component. Analyst often performs a steady state analysis before performing a transient analysis, to help establish initial condition. Modeling details Analysis Steady state thermal analysis to determine temperature distribution, total heat flux and directional heat fluxes of heat sink with rectangular fin, circular fin, interrupted rectangular fin and triangular fin bodies that are caused by thermal loads that do not vary over time. Build Geometry Construct a three dimensional representation of the heat sink with rectangular fin, circular fin, triangular fin and interrupted rectangular fin as shown in fig 1,2,3,4. It is assumed that all the fins have similar dimensions. Same thermal Conductivity, Same Material, Same base temperature. Generate Mesh: At this point ANSYS understand the makeup of the part. Now the modeled system should be broken down in to finite pieces. 4. DESIGN Figure 1 Rectangular fin heat sink editor@iaeme.com

3 Steady State Thermal Analysis of Heat Sink with Fins of Different Geometry Figure 2 Circular fin heat sink Figure 3 Triangular fin heat sink Figure 4 Interrupted Rectangular fin Heat sink editor@iaeme.com

4 V Naga Raju, P.Sivakumar, K Lakshmi Narayana, A Srujan, K Mallikarjun and G Krishna 5. MESHING Figure 5 Meshing of Rectangular fin heat sink Figure 6 Meshing of Circular fin heat sink Figure 7 Meshing of Triangular fin heat sink editor@iaeme.com

5 Steady State Thermal Analysis of Heat Sink with Fins of Different Geometry 6. OBTAIN THE SOLUTION 6.1. Temperature distribution Figure 8 Meshing of Interrupted Rectangular fin heat sink Figure 9 Rectangular fin heat sink The above shown figure represents the temperature distribution through rectangular fins. The maximum temperature distribution is degree Celsius and the minimum temperature distribution is degree Celsius. Figure 10 Circular fin heat sink editor@iaeme.com

6 V Naga Raju, P.Sivakumar, K Lakshmi Narayana, A Srujan, K Mallikarjun and G Krishna The above shown figure represents the temperature distribution through circular fins. The maximum temperature distribution is degree Celsius and the minimum temperature distribution is degree Celsius. Figure 11 Triangular fin heat sink The above shown figure represents the temperature distribution through Triangular fins. The maximum temperature distribution is degree Celsius and the minimum temperature distribution is degree Celsius. Figure 12 Interrupted rectangular fin heat sink The above shown figure represents the temperature distribution through interrupted rectangular fins. The maximum temperature distribution is degree Celsius and the minimum temperature distribution is degree Celsius editor@iaeme.com

7 Steady State Thermal Analysis of Heat Sink with Fins of Different Geometry 6.2. Total Heat Flux Figure 13 Rectangular fin heat sink The above shown figure represents the total heat flux through Rectangular fins. The maximum total heat flux is W/mm2 and the minimum total heat flux is W/mm2. Figure 14 Circular fin heat sink The above shown figure represents the total heat flux through Circular fins. The maximum total heat flux is W/mm2 and the minimum total heat flux is W/mm

8 V Naga Raju, P.Sivakumar, K Lakshmi Narayana, A Srujan, K Mallikarjun and G Krishna Figure 15 Triangular fin heat sink The above shown figure represents the total heat flux through Circular fins. The maximum total heat flux is W/mm2 and the minimum total heat flux is W/mm2. Figure 16 Interrupted Rectangular fin heat sink. The above shown figure represents the total heat flux through Interrupted Rectangular fins. The maximum total heat flux is W/mm2 and the minimum total heat flux is W/mm editor@iaeme.com

9 Steady State Thermal Analysis of Heat Sink with Fins of Different Geometry 6.3. Direction of Heat Flux Figure 17 Rectangular fin heat sink The above shown figure represents the directional heat flux through Rectangular fins. The maximum directional heat flux is W/mm2 and the minimum directional heat flux is W/mm2. Figure 18 Circular fin heat sink The above shown figure represents the directional heat flux through Circular fins. The maximum directional heat flux is W/mm2 and the minimum directional heat flux is W/mm2. Figure 19 Triangular fin heat sink editor@iaeme.com

10 V Naga Raju, P.Sivakumar, K Lakshmi Narayana, A Srujan, K Mallikarjun and G Krishna The above shown figure represents the directional heat flux through Triangular fins. The maximum directional heat flux is W/mm2 and the minimum directional heat flux is W/mm2. Figure 20 Interrupted Rectangular fin heat sink The above shown figure represents the directional heat flux through Interrupted Rectangular fins. The maximum directional heat flux is W/mm2 and the minimum directional heat flux is W/mm2. 7. RESULTS & DISCUSSION Table 1 Rectangular fin heat sink Min Max Temperature Total Heat flux Directional heat flux Table 2 Circular fin heat sink Min Max Temperature Total Heat flux Directional heat flux Table 3 Triangular fin heat sink Min Max Temperature Total Heat flux Directional heat flux Table 4 Interrupted Rectangular fin heat sink Min Max Temperature Total Heat flux Directional heat flux editor@iaeme.com

11 Steady State Thermal Analysis of Heat Sink with Fins of Different Geometry 8. CONCLUSION In Present work, a heat sink with Rectangular fin, Circular fin, Triangular fin and Interrupted Rectangular fin bodies are modeled and steady state thermal analysis is done by using solid works and ANSYS. These fins are used for cooling electronic elements. By observing the thermal analysis results, Total Heat flux is more for Interrupted Rectangular fin than other Rectangular fin, Circular fin and Triangular fin. REFERENCES [1] Biermann, A. E. and B. Pinkel (1934). Heat Transfer from finned metal cylinders in an air stream, NACA Report No.488. [2] J.Ajay Paul, SagarChavan Vijay, Magarajan&R.ThundilKaruppaRaj, Experimental and Parametric Study of Extended Fins in the Optimization of Internal Combustion Engine Cooling Using CFD, International Journal of Applied Research in Mechanical Engineering. [3] J.C.Sanders, et al. (1942). Cooling test of an air cooled engine cylinder with copper fins on the barrel, NACA Report E-103. [4] DenpongSoodphakdee, et al. (2001). "A Comparison of Fin Geometries for Heat sinks in Laminar Forced Convection Part 1 - Round, Elliptical, and Plate Fins in Staggered and In-Line Configurations."The International Journal of Microcircuits and Electronic Packaging 24(1). [5] Fernando Illan and M. Alarcon (2002)."Optimization of Annular Cylindrical and Spherical Fins in an Internal Combustion Engine under Realistic Conditions."Journal of Thermal Science and Engineering Applications. [6] A. Bassam and K. A. Hijleh (2003)."Enhanced Forced Convection Heat Transfer from a Cylinder Using Permeable Fins."ASME Journal of Heat Transfer 125. [7] Yoshida Masao, et al. (2005). "Air-Cooling Effects of Fins on a Motorcycle Engine." Nippon Kikai Gakkai Ronbunshu B Hen (Transactions of the Japan Society of Mechanical Engineers Part B) (Japan) 17(9): [8] Abhay Sehgal, Vinay Aggarwal and Satbir S. Sehgal, Computational Analysis of Stepped and Straight Microchannel Heat Sink. International Journal of Mechanical Engineering and Technology, 8(2), 2017, pp [9] C. Han-Taw and Cs (2006). "Investigation of natural convection heat transfer coefficient on a vertical square fin of finned-tube heat exchangers." International Journal of Heat and Mass Transfer 49(1718): [10] Shekhar Dinkar Thakre, Jayashree P. Zope, Nilima A. Bachchuwar and Sourabh S. Kulkarni, Analysis of Straight Microchannel Heat Sink Using Computational Fluid Dynamics. International Journal of Mechanical Engineering and Technology, 7(4), 2016, pp editor@iaeme.com