Experimental Investigations of Different Loudspeakers Applied as Synthetic Jet Actuators

Paweł Gil,Joanna Wilk

doi:10.3390/act10090224

Abstract

The paper presents the preliminary results of the experimental investigation of four various loudspeakers used for driving the synthetic jet actuator. The parameters, characteristic synthetic jet velocity, pressure inside the cavity, device sound pressure level (SPL), and the heat sink thermal resistance, were presented for various input power and driving frequency. The resonance frequency was determined based on electrical impedance. The highest synthetic jet momentum velocity was achieved at diaphragm resonance frequency. The maximum sound pressure level was observed, also at resonant frequency. For the same real power delivered to the actuator and for its resonance frequency, the heat sink thermal resistance had the lowest value for the specific loudspeaker. In turn, the synthetic jet velocity reached maximum for this actuator. For all actuators tested, the sound pressure level was dependent on momentum velocity.

Highlights

Experimental Investigations of Synthetic jet (SJ) actuators are a novel, interesting kind of generators of the fluid flow
The different loudspeakers resulted in the different synthetic jet actuator performances
The different loudspeakers resulted in the different synthetic jet actuator perforFrom the energetic point of view, the best actuator is characterized by high energy convermances

Summary

Introduction

Experimental Investigations of Synthetic jet (SJ) actuators are a novel, interesting kind of generators of the fluid flow. They have been widely researched since 1990 [1]. SJ may be useful in heat transfer enhancement processes [11,12,13,14,15], mixing [16], flow control [17,18] or propulsions [19]. The first position [20] includes a brief review of heat transfer enhancement using SJ characterized by different parameters. The second article [21] presents the review of SJ performances and parameters that can impact the fluid flow and heat transfer processes

Results

Discussion

Conclusion