Mechanics of Smart Structures

Mechanics of Smart Structures

The flow structure and thermal performance of a twin self-excited jet under different thermal and hydrodynamic boundary conditions

Document Type : Original Article

Authors
Mohammad Jaafarian 1
Seyyed Alireza Zolfaghari 2
Amir Omidvar 3
Javad Khadem 4
Mahtab Aminzadeh 5
1 Educational group of mechanical engineering, Higher education complex of Bam
2 Engineering Department, university of Birjand, Birjand, Iran
3 Engineering Department, Shiraz university of technology
4 Engineering department, university of Birjand, Birjand, Iran
5 Independent researcher
10.30511/jmms.2026.2084157.1038
Abstract
In this study, twin self-excited oscillatory jets have been evaluated as a devices that have the ability to create oscillatory flow without the external factors. In this regard, the effects of heat flux and inlet flow velocity on the oscillation frequency and flow deflection angle along with the thermal performance have been studied by using the finite volume numerical method and the OpenFoam code. In the present study, the nozzle spacing is constant and the impinging heat flux to the end wall and inlet flow velocity are q= 0-5000-10000 W/m2, and U0=4-8 m/s respectively. The numerical results indicate that by increasing the impinging heat flux on the end wall of the chamber, the oscillation frequency increases quasi-linearly. In addition, at a constant heat flux, by growing the inlet flow velocity, the oscillation frequency and deflection angle increase. On the other hand, the average Nusselt number on the impinging wall increases by increasing the inlet flow velocity and decreasing the heat flux.
Keywords
Self-excited oscillating jet
Oscillatory jet
Twin jet
Oscillation frequency
Mechanics of Smart Structures
Volume 1, Issue 4
Summer 2025