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Three-dimensional Particle Tracking Velocimetry for Turbulence Applications: Case of a Jet Flow
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Flow Separation and Turbulence in Jet Pumps for Thermoacoustic Applications
Joris P Oosterhuis1, Anton A Verbeek1, Simon Bühler1
1Department of Thermal Engineering, University of Twente, Enschede, The Netherlands.
Flow, Turbulence and Combustion
|September 4, 2018
Summary
This study investigates jet pump performance in oscillatory flows. Turbulence reduces flow separation, improving jet pump performance compared to laminar flows.
Area of Science:
- Fluid dynamics
- Acoustics
Background:
- Jet pumps are static devices that induce hydrodynamic effects in oscillatory flows.
- These effects can create a time-averaged pressure drop, useful for suppressing acoustic streaming in thermoacoustic devices.
Purpose of the Study:
- To investigate the impact of flow separation and turbulence on jet pump performance in oscillatory flows.
- To compare experimental results with numerical findings on laminar flow jet pump performance.
Main Methods:
- Experimental measurements of time-averaged pressure drop and acoustic power dissipation.
- Hot-wire anemometry to determine the onset of flow separation.
- Comparison with published numerical simulations.
Main Results:
- Flow separation negatively affects jet pump performance in laminar oscillatory flow.
- Experimental confirmation of a critical Reynolds number for oscillatory pipe flows in jet pumps.
- Turbulence was found to reduce flow separation, enhancing jet pump performance.
Conclusions:
- Jet pump performance in oscillatory flows is significantly influenced by flow separation.
- Turbulence offers a mechanism to improve jet pump efficiency by mitigating flow separation.
- Findings are relevant for the design of effective jet pumps in thermoacoustic applications.
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