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Dynamic mesh methods and user defined functions are adopted and the shear stress transport k-ω turbulent model has been used in the numerical investigation of heat transfer performance of synthetic jet impingement onto dimple/protrusioned surface. The results show that the local time-averaged Nusselt number of the dimpled/protrusioned target surface tends to be much closer with that of flat cases with increasing of frequency. The heat transfer performance gets better when frequency increases. The area-averaged time-averaged Nusselt number of protrusioned target surface is the most close to that of flat cases when f = 320 Hz while it is the smallest among the synthetic jet cases in dimpled target surface. The heat transfer enhancement performance of synthetic jet is 30 times better than that of natural convection. The time-averaged Nusselt number of stagnation point in the protrusioned target surface is higher than that of flat target surface while it is lower in the dimpled surface than that of flat surface no matter in the synthetic jet, steady jet or natural convection cases. Meanwhile, the timeaveraged Nusselt number of stagnation point in the synthetic jet cases increases with the increasing of frequency. It is worth pointing out that the time-averaged Nusselt number of stagnation point is lower than that of steady cases when the frequency is low. However, it shows a bit higher than that of steady cases when f = 320 Hz.
PAPER REVISED: 2015-02-08
PAPER ACCEPTED: 2015-03-05
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THERMAL SCIENCE YEAR 2015, VOLUME 19, ISSUE Supplement 1, PAGES [S221 - S229]
  1. You, D., et al., Active Control of Flow Separation over an Airfoil Using Synthetic Jets, Journal of Fluids and Structures, 24 (2008), 8, pp. 1349-1357
  2. Vukasinovic, J., et al., Spot-Cooling by Confined, Impinging Synthetic Jet, Proceedings, HT2003, ASME Summer Heat Transfer Conference, Las Vegas, Nev., USA, HT2003-47245, 2003
  3. Arik, M., Local Heat Transfer Coefficients of a High-Frequency Synthetic Jet during Impingement Cooling over Flat Surfaces, Heat Transfer Engineering, 29 (2008), 9, pp. 763-773
  4. Arik, M., et al., Steady and Unsteady Air Impingement Heat Transfer for Electronics Cooling Applications, Journal of Heat Transfer, 135 (2013), 11, pp. 111009-111009
  5. Valiorgue, P., et al., Heat Transfer Mechanisms in an Impinging Synthetic Jet for a Small Jet-to-Surface Spacing, Experimental Thermal and Fluid Science, 33 (2009), 4, pp. 597-603
  6. Chaudhari, M., et al., Heat Transfer Characteristics of Synthetic Jet Impingement Cooling, International Journal of Heat and Mass Transfer, 53 (2010), 5-6, pp. 1057-1069
  7. Chaudhari, M., et al., Heat Transfer Characteristics of a Heat Sink in Presence of a Synthetic Jet, Components, Packaging and Manufacturing Technology, IEEE Transactions, 2 (2012), 3, pp. 457-463
  8. Tan, X., et al., Flow and Heat Transfer Characteristics under Synthetic Jets Impingement Driven by Piezoelectric Actuator, Experimental Thermal and Fluid Science, 48 (2013), July, pp. 134-146
  9. Kanokjaruvijit, K., et al., Jet Impingement on a Dimpled Surface with Different Crossflow Schemes, International Journal of Heat and Mass Transfer, 48 (2005), 1, pp. 161-170
  10. Jefferson-Loveday, R. J., et al., LES of Impingement Heat Transfer on a Concave Surface, Numerical Heat Transfer, Part A: Applications, 58 (2010), 4, pp. 247-271
  11. Celik, N., Effects of the Surface Roughness on heat Transfer of Perpendicularly Impinging co-Axial Jet. Heat and Mass Transfer, 47 (2011), 10, pp. 1209-1217

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