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research-article

Experimental Study of the Incidence of Changing a Synthetic Jet Orifice in Heat Transfer Using a Taguchi Method Approach

[+] Author and Article Information
Sebastian Cano

Department of Mechanical and Mechatronics Engineering, Universidad de las Fuerzas Armadas ESPE, Sangolqui, Ecuador
jscano@espe.edu.ec

Gustavo David Cordova Cardenas

Department of Mechanical and Mechatronics Engineering, Universidad de las Fuerzas Armadas ESPE, Sangolqui, Ecuador
gcordova@espe.edu.ec

Christian Narváez

Department of Mechanical Engineering, Universidad de las Fuerzas Armadas ESPE, Sangolqui, Ecuador
cpnarvaez1@espe.edu.ec

Luis Segura

Department of Mechanical Engineering, Universidad de las Fuerzas Armadas ESPE, Sangolqui, Ecuador
ljsegura@espe.edu.ec

Luis Carrion

Department of Mechanical Engineering, Universidad de las Fuerzas Armadas ESPE, Sangolqui, Ecuador
lmcarrion1@espe.edu.ec

1Corresponding author.

ASME doi:10.1115/1.4042351 History: Received June 06, 2018; Revised December 13, 2018

Abstract

The current study allows the recognition of the most optimal combination of a variety of parameters (excitation frequency, kind of orifice, and synthetic jet-to-surface spacing) in order to obtain the lowest cooling time using a Taguchi experimental design. Furthermore, the heat transfer and synthetic jet velocity behavior using different kinds of orifices are demostrated experimentally. A piezoelectric diaphragm has been selected as vibrating actuator. Four kinds of orifices have been studied: circular, rectangular, triangular and square. First, the study consists of recognizing the excitation frequency in which each orifice produces the highest flow velocity. A hotwire anemometer has been used in order to measure the synthetic jet velocity. Furthermore, a steel plate has been heated and then cooled using the synthetic jet set at the excitation frequency in which the jet velocity was the largest for each orifice . For the statistical analysis, the input study variables have been kind of orifice and jet-to-surface spacing. The output variable has been the cooling time.The results demostrate that using a combination of a rectangle orifice, 20 mm of jet-to-surface spacing and an excitation frequency of 2000 Hz, the cooling time is the least. In addition, using these parameters, a mean heat transfer coefficient of 11.05 (W/m^2°K) with a coefficient of performance (COP) of 49.21 have been obtained. Finally, for each kind of orifice there is the presence of two resonant frequencies, the Helmholtz (acoustic resonance) frequency and piezoelectric diaphragm natural frequency.

Copyright (c) 2018 by ASME
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