Annular synthetic jet used for impinging flow mass-transfer

Abstract

An annular synthetic jet was investigated experimentally, both with and without an opposing impingement wall. The experiments involved smoke visualization and mass transfer measurement on the wall by means of naphthalene sublimation technique. Two qualitatively different flow field patterns were identified, depending upon the driving amplitude level. With small amplitudes, vortical puffs maintain their identity for a relatively long time. If the amplitudes are large, breakdown and coalescence of the vortical train is much faster. Also the resultant mass transfer to the impingement wall is then much higher. Furthermore, a fundamental change of the whole flow field was observed at the high end of the investigated frequency range, associated with radical reduction of the size of the recirculation bubble. D

Experimental Investigation of a Synthetic Jet Array in a Laminar Channel Flow

“…• The use of a stand-alone SJ or system of synthetic jets (SJ used for intensification of heat transfer [10,11].…”

Comparison of synthetic jet actuators based on sharp-edged and round-edged nozzles

“…The potential applications have been found especially in boundary-layer separation control [3][4][5][6][7][8][9][10], jet vectoring [11][12][13][14][15][16], heat transfer enhancement [17][18][19][20][21][22], and mixing [23][24][25]. A variant of the SJ, namely a non-zero-net-mass-flux jet (or hybrid SJ), has been investigated more recently [26-28, 21, 29-31].…”

Active control of the jet in coaxial arrangement

“…SJs are usually used in application with heat transfer (e.g. [2,3,4,5]), control of flows, wakes and boundary layer (e.g. [6,7,8,9,10]).…”