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ARTICLE:
Zdenek Travnicek
Institute of Thermomechanics, Academy of Sciences of the Czech Republic Tomas Vit
Faculty of Mechanical Engineering, TU in Liberec, Hálkova 6, 461 17Liberec, Czech Republic
ABSTRACT A possibility to enhance the “synthetic jet” has been studied. Instead of the typical zero-net-mass-flux synthetic jets, the non-zero-net-mass-flux hybrid synthetic jet was proposed. An additional volume rate is entrained (pumped) through a pair of auxiliary channels into the actuator cavity. Not any fluid supply is added from any external source (neither blower nor compressor are needed).
Three variants are experimentally studied, namely (a) the synthetic (zero-net-mass-flux) jet, (b) hybrid synthetic (non-zero-net-mass-flux) jet, and (c) continuous jet. Flow visualization, hotwire measurement, and mass transfer measurement using the naphthalene sublimation technique have been performed.
The present experiments confirmed that the hybrid synthetic jet achieves higher extrusion volume flow rate in comparison with the common synthetic jets. An appreciable enhancement of the impingement heat/mass transfer was achieved. The main reason for the heat/mass transfer enhancement is the speedup of the time-mean flow by means of higher extrusion volume flow rate.
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JET-15 pages
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