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A Comparative Study of the Enhancement of Heat Transfer by Delta Wing Vortex Generators and V Shaped Dimples Using Experimentation and CFD


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DOI: https://doi.org/10.15866/ireme.v11i10.12898

Abstract


Heat transfer augmentation without considerable pressure drop is one of the most important issues nowadays and, hence, different active and passive methods are used for the same. In this study, two methods are used, one by use of delta wing vortex generators and the other is V-shaped dimples to enhance heat transfer.  Delta wings are mounted on a flat plate using inline and staggered arrangement. The analysis is performed for delta wing vortex generators of 0.6mm thickness on an Aluminium plate of 150mm × 150mm size and 10mm thickness with an angle of attack of delta wings of 450, a variation in velocities of 2.5m/s, 3.5m/s and 4.5m/s with inline and staggered positions of vortex generators. The experiments were performed on 150mm × 150mm × 10mm aluminum plate with V- shaped dimples with pitch 3.2D, where D = diameter of dimple. V-dimples with δ/D = 0.2, 0.3, 0.5 are investigated, where δ= dimple depth. Two different arrangements of V –dimples, namely inline and staggered, were used during experimentation and the results obtained were compared to the flat surface without dimples. The experimentation was carried over a rectangular duct with aspect ratio 3:2. The Values of h, Nu, f and the overall thermal performance of the dimpled surface are compared with those from flat surface under the same conditions. The results of both cases are compared to each other and to the bare plate also. Using the CFD analysis in both cases, it has been observed that the heat transfer enhancement using Delta wing vortex generators is effective (almost 10-15% more) compared to V-shaped dimples.
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Keywords


Delta Wings; V-Shaped Dimples; Staggered Arrangement; Turbulence Eddy; Vortex Generators

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