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Heat/Mass Transfer of Pulsatile Impinging Jets

DOI: 10.1615/ICHMT.2006.TurbulHeatMassTransf.880
pages 437-440

Zdenek Travnicek
Institute of Thermomechanics of the Czech Academy of Sciences

Tomas Vit
Institute of Thermomechanics AS CR, and Faculty of Mechanical Engineering, Technical University of Liberec, Czech Republic

T. Hyhlik
Faculty of Mechanical Engineering, Czech Technical University in Prague, Technická 4, 166 07 Prague 6, Czech Republic

Frantisek Marsik
Institute of Thermomechanics, Czech Academy of Sciences, Dolejskova 5, 182 00 Prague 8, Czech Republic


The present study focuses on the pulsatile round impinging jets. To enhance the impingement heat/mass transfer, a continual (steady) jet is combined with the synthetic (zero-net-mass-flux) jet. The resulting mixed pulsed jet has a significant non-zero blowing component: the ratio of the extrusion and suction mass fluxes at the actuator orifice exit is 3.1. Measurements of the flow field velocity and mass transfer on the wall (using flow visualization, hot-wire anemometry, and naphthalene sublimation technique) have been performed. The experiments demonstrate the anticipated heat/mass transfer enhancement caused by the coupling of the flow oscillation and the time-mean Reynolds number effects.

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