Computational Analysis Of Notched Fin Arrays Dissipating Heat By Natural Convection

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From the experimental study it is found that the heat transfer rate in notched fins is more than the un-notched fins. The average heat transfer coefficient increases with the heater input. It is clear that for the given heater input, average heat transfer coefficient of notched array is 30 to 40% higher than corresponding un-notched array. The average heat transfer coefficient for notched fin is better than un-notched fins. Also the copper gives more heat transfer rate than aluminum plate. As the notch area of fin increases the heat transfer rate also increases. In this experimental study, an attempt is made to improve the performance of horizontal rectangular fin array by removing the less effective portion of stagnant zone of the …show more content…
The average heat transfer coefficient for without notched fin is 8.3887 W/m2K whereas for 20% notched fins it is 9.8139 W/m2K. Also the copper gives more heat transfer rate than aluminum plate. Copper plate gives better heat transfer rate than aluminum plate.
S. M. Wange, R. M. Metkar did “Computational Analysis of Inverted
Notched Fin Arrays Dissipating Heat by Natural Convection” [8].
Experimentation is done for four different cases of inverted notch fin arrays. For experimental setup, they made base plate and fins are from
1.2 mm thick rolled aluminum sheet to form the required fin array. The parameters of the fin arrays for experimental work are shown below in table. In this investigation experimental and computational analysis of fin array is done. For Computational analysis they used
Ansys Fluent-12 software.
Table 1: Different parameters of fin array used
Sr. No. L (mm) H (mm) S (mm) No. Of Fins Depth of Notch
1 127 38 8 7 Without Notch
2 127 38 8 7 40%
3 150 75 8 7 40%
4 175 85 8 7 40%
It is concluded that the in notch fin array the heat transfer coefficient is more than without notch fin array. The value
…show more content…
In this investigation, the fin arrays were made by removing the central fin portion by cutting a notch of different geometrical shapes and adding this removed material at the entrance of arrays on the two sides, where it is more effective and thereby keeping fin surface area same. For Computational analysis models of different aspect ratios (L/H) were created and meshed in ANSYS ICEM CFD’s meshing modules and solved using the Fluent 6.3 solver. Solution for sets of fins of different aspect ratio was obtained. Aspect ratios used are 0.866, 1.00, 1.333, 1.266, and 1.400.
He found that heat transfer coefficient increases with increasing aspect ratio and then decreases after a threshold value of 1.266. This has been shown by the CFD analysis.
3. Conclusions
There is single chimney flow pattern in case natural convection heat transfer which reduces heat transfer from surface. So making notch is effective method for increasing heat transfer. The values of heat transfer coefficient are higher for notched fin arrays giving better performance. The single chimney flow pattern is also present in

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