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Journal of Enhanced Heat Transfer
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ISSN Imprimir: 1065-5131
ISSN En Línea: 1026-5511

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.2013005875
pages 115-136

INFLUENCE OF JET-TO-SURFACE DISTANCE AND FREQUENCY ON UNSTEADY HEAT TRANSFER AND MASS FLOW RATES IN AN IMPINGEMENT SYNTHETIC JET

Farzad Bazdidi-Tehrani
School of Mechanical Engineering, Iran University of Science and Technology, Tehran 16846-13114, Iran
Akbar Eghbali
School of Mechanical Engineering, Iran University of Science and Technology, Tehran 16846-13114, Iran
Mahdi Karami
School of Mechanical Engineering, Iran University of Science and Technology, Tehran 16846-13114, Iran

SINOPSIS

Synthetic jets have been emerging as a promising flow control technique since they introduce flow perturbation without net mass injection. The present work deals with analysis of unsteady heat transfer and mass flow rates concerning a synthetic jet impinging on a constant heat flux disk. A harmonic time-dependent velocity profile is assumed at jet orifice outlet. The v2 − f turbulence model, suitable for problems with stagnation points, is employed and compared with the SST/k−ω model. The problem is considered under incompressible, axisymmetric, and temperature-dependent properties assumptions and the pressure-implicit with splitting of operators (PISO) algorithm is employed for coupling of continuity and momentum equations. Influence of simulated diaphragm oscillation frequency (30 ≤ fr ≤ 2500 Hz) and jet-to-surface distance (2 ≤ H/d ≤ 25) is investigated at constant Reynolds number (Re = 2210) and for stroke length 0.551 ≤ L0/d ≤ 27.6. For lower frequencies, the time-averaged Nusselt number increases as frequency raises and for higher frequencies, the Nusselt number decreases as frequency elevates. Results also show that the Nusselt number increases as H/d is raised within smaller H/d for all fr. However, this increase does not continue for larger H/d. Also, synthetic jets are capable of providing more heat transfer than continuous jets at identical Re at large H/d. Finally, flow pattern and mass flow and heat transfer rates taking place through the pressure outlet boundary condition are thoroughly studied.


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