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research-article

Impingement Heat/Mass Transfer to the Synthetic Jet Generated by a Biomimetic Actuator

[+] Author and Article Information
Zdenek Travnicek

Institute of Thermomechanics of the Czech Academy of Sciences, Dolejškova 5, 182 00 Prague 8, Czech Republic
tr@it.cas.cz

Zuzana Brouckova

Institute of Thermomechanics of the Czech Academy of Sciences, Dolejškova 5, 182 00 Prague 8, Czech Republic
brouckova@it.cas.cz

1Corresponding author.

ASME doi:10.1115/1.4042781 History: Received September 18, 2018; Revised January 05, 2019

Abstract

Two biomimetic synthetic jet actuators were designed, manufactured, and tested under conditions of a jet impingement onto a wall. Nozzles of the actuators were formed by a flexible diaphragm rim, the working fluid was air, and the operating frequencies were chosen near the resonance at 65 Hz and 69 Hz. Four experimental methods were used: phase-locked visualization of the oscillating nozzle lips, jet momentum flux measurement using a precision scale, hot-wire anemometry, and mass transfer measurement using the naphthalene sublimation technique. The results demonstrated possibilities of the proposed actuators to cause a desired heat/mass transfer distribution on the exposed wall. It was concluded that the heat/mass transfer rate was commensurable with a conventional continuous impinging jets at the same Reynolds numbers.

Copyright (c) 2019 by ASME
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