Experimental and numerical investigations were performed to evaluate the effects of the exit nozzle configuration of a fluidic oscillator on the flowfield and impingement heat transfer performance downstream on a flat plate. A conventional wall-attachment-type fluidic oscillator with a fan-shaped exit configuration was studied. Eight different exit fan angles ( 0    deg θ 130    deg ) were considered, and the effects of each nozzle configuration on the jet oscillation frequency, average fluid fan angle θ jet , and discharge coefficient C d were studied. Results show that the exit fan angle has a significant effect on the average fluid fan angle. Initially, θ jet increases along with the fan angle up to ( θ 70    deg ); beyond which, θ jet eventually plateaus with further increase in θ . The jet oscillation frequency appears to be independent of nozzle configurations. A case study was performed that includes sweeping jet impingement heat transfer in order to assess the practical implication of the exit geometry. Heat transfer experiments were performed for each nozzle configuration at a jet-to-wall spacing of H / D = 5 and three coolant mass flow rates ( m ˙ = 0.97 , 1.48, and 1.97    g / s ). The average heat transfer tends to deteriorate with increasing fan angle. However, a pronounced improvement in cooling uniformity ζ was observed at large-fan-angle configurations ( θ 70    deg ). The time-resolved velocity field obtained from an unsteady Reynolds-averaged Navier–Stokes simulation revealed that separation bubble starts to appear at the diverging wall of the nozzle exit when θ > 70    deg that prevents the lateral motion of the jet, thus reduces the average fluid fan angle.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Effects of Fluidic Oscillator Nozzle Angle on the Flowfield and Impingement Heat Transfer


    Contributors:

    Published in:

    AIAA Journal ; 59 , 6 ; 2113-2125


    Publication date :

    2021-04-12


    Size :

    13 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    FLUIDIC NOZZLE AND OSCILLATOR CIRCUIT

    GOPALAN SHRIDHAR / HARTRANFT EVAN | European Patent Office | 2020

    Free access

    Phase-Averaging Methods for the Natural Flowfield of a Fluidic Oscillator

    Ostermann, Florian / Woszidlo, Rene / Nayeri, Christian N. et al. | AIAA | 2015



    MICRO-SIZED FLUIDIC NOZZLE AND CONSTRUCTION METHOD FOR FLUIDIC OSCILLATOR WASH NOZZLE

    GOPALAN SHRIDHAR / ZHAO CHUNLING / KLINE ZACHARY D | European Patent Office | 2020

    Free access

    Fluidic nozzle and improved moving vortex generating fluidic oscillator

    GOPALAN SHRIDHAR / HARTRANFT EVAN | European Patent Office | 2018

    Free access