首页|Numerical study of flow and thermal characteristics of pulsed impinging jet on a dimpled surface
Numerical study of flow and thermal characteristics of pulsed impinging jet on a dimpled surface
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This research comprehensively investigates the flow and thermal characteristics of a pulsating impinging jet over a dimpled surface.It analyzes the impact of key parameters(e.g.,inlet velocity pulsation functions,pulsation fre-quency,amplitude,dimple pitch,dimple depth,Reynolds number)on flow patterns and heat transfer.Validated computational fluid dynamics and the Re-normalization group turbulence model are employed to accurately sim-ulate complex turbulent flow behavior.Local and average heat transfer coefficients are calculated and compared to steady impingement cases,revealing the potential benefits of pulsation for heat transfer enhancement.The study also examines how pulsation-induced flow modulation and thermal mixing affect heat transfer mecha-nisms.Results indicate that combining fluctuating flow with a dimpled surface can improve heat transfer rates.In summary,increasing pulsation amplitude consistently enhances heat transfer,while the effect of frequency varies between impinging and wall jet zones.
Pulsating impinging jetDimpled surfaceHeat transfer enhancementPulsation frequency and amplitudeCoherent structures
Amin Bagheri、Kazem Esmailpour、Morteza Heydari
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Renewable Energy Research Center,Damavand Branch,Islamic Azad University,Damavand,Iran
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