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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/7176

Title: Frequency response of a synthetic jet cavity
Authors: CHAUDHARI, M
VERMA, G
PURANIK, B
AGRAWAL, A
Keywords: microjet actuators
reynolds-number
mean flow
evolution
design
Issue Date: 2009
Publisher: ELSEVIER SCIENCE INC
Citation: EXPERIMENTAL THERMAL AND FLUID SCIENCE, 33(3), 439-448
Abstract: A synthetic jet results from periodic oscillations of a diaphragm in a cavity. We present the results of a detailed experimental investigation wherein the effect of excitation frequency on the synthetic jet flow is studied for cavities of different depths and for orifices of different diameters. The exit velocity averaged over an excitation cycle indicates a lower and an upper bound on the frequency for the formation of a jet, and shows resonance at two frequencies. The resonant frequencies have been identified as being close to the diaphragm and the Helmholtz frequencies, with the former being more important in the present set of experiments. We discuss approaches to manipulate these frequencies from the point of view of cavity design. Interestingly, the input power is found to be at a minimum at the diaphragm frequency. Our measurements over a relatively large parameter domain suggest that the turbulence intensity in the near field is independent of the cavity depth and excitation frequency, but depends on the orifice diameter. These results are expected to be useful for designing synthetic jet cavity. (C) 2008
URI: http://dx.doi.org/10.1016/j.expthermflusci.2008.10.008
http://dspace.library.iitb.ac.in/xmlui/handle/10054/7176
http://hdl.handle.net/10054/7176
ISSN: 0894-1777
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