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Journal of Enhanced Heat Transfer
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ISSN Druckformat: 1065-5131
ISSN Online: 1026-5511

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.2016012585
pages 417-440

ON THE SIMULATION OF DIAPHRAGM OSCILLATION AND MODELING METHODS FOR AN IMPINGING SYNTHETIC JET

Navid Madanchi
School of Mechanical Engineering, Iran University of Science and Technology, Tehran 16846-13114, Iran
Farshad Kowsary
Department of Mechanical Engineering, University College of Engineering, University of Tehran, Tehran 515-14395, Iran
Farzad Bazdidi-Tehrani
School of Mechanical Engineering, Iran University of Science and Technology, Tehran 16846-13114, Iran

ABSTRAKT

The current paper focuses on different methods of simulation of an axisymmetric impinging synthetic jet positioned on a constant heat flux disk. This zero-net mass-flux jet provides an unsteady turbulent flow by oscillation of a piston or a membrane. The present results are validated against the existing experimental data, demonstrating that the ν2f turbulence model is suitable not only in problems using velocity profiles as the inlet boundary condition, but also in problems with moving boundaries and dynamic mesh methods. It illustrates that in a numerical simulation of an impinging synthetic jet, the finest method to provide the most truthful data is full simulation of the cavity and actuator, including a moving boundary, and employing the ideal gas model. In order to calculate Nusselt numbers or temperature distributions, it is necessary to utilize the moving boundary along with a grid method. This is because assigning a definite amount for the inlet thermal boundary condition in a blowing cycle can result in error in the prediction of heat transfer. On the other hand, in problems that do not include heat transfer or cooling, a velocity inlet boundary and the incompressibility assumption are adequate to indicate the appropriate data of velocity variations.


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