Publication de 8 numéros par an
ISSN Imprimer: 1065-5131
ISSN En ligne: 1563-5074
Indexed in
INFLUENCE OF JET-TO-SURFACE DISTANCE AND FREQUENCY ON UNSTEADY HEAT TRANSFER AND MASS FLOW RATES IN AN IMPINGEMENT SYNTHETIC JET
RÉSUMÉ
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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Alimohammadi Sajad, Fanning Eoin, Persoons Tim, Murray Darina B., Characterization of flow vectoring phenomenon in adjacent synthetic jets using CFD and PIV, Computers & Fluids, 140, 2016. Crossref
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Hatami Mohammad, Bazdidi-Tehrani Farzad, Abouata Ahmad, Mohammadi-Ahmar Akbar, Investigation of geometry and dimensionless parameters effects on the flow field and heat transfer of impingement synthetic jets, International Journal of Thermal Sciences, 127, 2018. Crossref
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Khuntia Aswini Kumar , Patro Pandaba, Ghoshal Sanjoy , THERMAL PERFORMANCE ANALYSIS OF A SYNTHETIC JET ACTUATOR WITH MOVING BOUNDARY CONDITION , Journal of Enhanced Heat Transfer, 29, 5, 2022. Crossref
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Kang Ying, Luo Zhenbing, Deng Xiong, Zhu Yinxin, Xia Zhixun, Dual Synthetic Jet Actuator and Its Applications—Part IV: Analysis of Heat Dissipation and Entropy Generation of Liquid Cooling with Dual Synthetic Jet Actuator, Actuators, 11, 12, 2022. Crossref