STEADY STATE THERMAL ANALYSIS OF HEAT SINK WITH FINS … · 2017. 5. 22. · [8] Abhay Sehgal,...

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International Journal of Mechanical Engineering and Technology (IJMET) Volume 8, Issue 5, May 2017, pp. 196–206 Article ID: IJMET_08_05_019

Available online at http:// http://www.iaeme.com/ijmet/issues.asp?JType=IJMET&VType=8&IType=5

ISSN Print: 0976-6340 and ISSN Online: 0976-6359

© 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, 522502

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. 196-206.

http:// http://www.iaeme.com/ijmet/issues.asp?JType=IJMET&VType=8&IType=5

1. 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

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

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



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



Figure 8 Meshing of Interrupted Rectangular fin heat sink

6. OBTAIN THE SOLUTION

6.1. Temperature distribution


The above shown figure represents the temperature distribution through rectangular fins. The

maximum temperature distribution is 59.784 degree Celsius and the minimum temperature

distribution is 54.262 degree Celsius.




The above shown figure represents the temperature distribution through circular fins. The




The above shown figure represents the temperature distribution through Triangular fins. The



Figure 12 Interrupted rectangular fin heat sink

The above shown figure represents the temperature distribution through interrupted rectangular

fins. The maximum temperature distribution is 70.263 degree Celsius and the minimum

temperature distribution is 63.039 degree Celsius.



6.2. Total Heat Flux


The above shown figure represents the total heat flux through Rectangular fins. The maximum

total heat flux is 0.019343 W/mm2 and the minimum total heat flux is 0.00038766 W/mm2.


The above shown figure represents the total heat flux through Circular fins. The maximum

total heat flux is 0.023847 W/mm2 and the minimum total heat flux is 0.00029706 W/mm2.




The above shown figure represents the total heat flux through Circular fins. The maximum

total heat flux is 0.010948W/mm2 and the minimum total heat flux is 0.00031486 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 0.026785 W/mm2 and the minimum total heat flux is 0.00021257

W/mm2.



6.3. Direction of Heat Flux


The above shown figure represents the directional heat flux through Rectangular fins. The

maximum directional heat flux is 0.0067585 W/mm2 and the minimum directional heat flux is -

0.007433 W/mm2.


The above shown figure represents the directional heat flux through Circular fins. The


0.013096 W/mm2.




The above shown figure represents the directional heat flux through Triangular fins. The


0.005803 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 0.0086222 W/mm2 and the minimum directional heat

flux is -0.0093937 W/mm2.

7. RESULTS & DISCUSSION

Table 1 Rectangular fin heat sink

Min Max

Temperature 54.262 59.784

Total Heat flux 0.00038766 0.019343

Directional heat flux -0.007433 0.006785

Table 2 Circular fin heat sink

Min Max


Total Heat flux 0.00029706 0.023847


Table 3 Triangular fin heat sink

Min Max


Total Heat flux 0.00031486 0.010948


Table 4 Interrupted Rectangular fin heat sink

Min Max


Total Heat flux 0.00021257 0.026785

Directional heat flux 0.013096 0.0089949



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

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stream, NACA Report No.488.

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[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

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International Journal of Mechanical Engineering and Technology, 7(4), 2016, pp. 234–242.

STEADY STATE THERMAL ANALYSIS OF HEAT SINK WITH FINS … · 2017. 5. 22. · [8] Abhay Sehgal,...

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