The study of self-sustained oscillating plane jet flow impinging upon a small cylinder

1999 ◽  
Vol 27 (5) ◽  
pp. 392-399 ◽  
Author(s):  
F.-B. Hsiao ◽  
Y.-W. Chou ◽  
J.-M. Huang
Keyword(s):  
Jet Flow ◽  
Plane Jet ◽  
Small Cylinder

scholarly journals Image Measurement of Plane Jet Flow with Self-Induced Sloshing

1999 ◽  
Vol 19 (Supplement1) ◽  
pp. 297-300
Author(s):  
Taketoshi OKUNO ◽  
Shigeru NISHIO ◽  
Hidenaga IWAHASHI
Keyword(s):  
Jet Flow ◽  
Image Measurement ◽  
Plane Jet

The Shear Layers of a Two-Dimensional Jet Excited by Flexible Wires

2003 ◽  
Vol 125 (3) ◽  
pp. 597-599
Author(s):  
Ming-huei Yu ◽  
Yi-chun Liao ◽  
Chung-ho Tseng
Keyword(s):  
Spectral Analysis ◽  
Shear Layer ◽  
Density Ratio ◽  
Jet Flow ◽  
Shear Layers ◽  
Spanwise Direction ◽  
External Forcing ◽  
Two Dimensional ◽  
Air Jet ◽  
Plane Jet

A two-dimensional air jet, heated at a density ratio of 0.8, under external forcing by flexible wires is investigated experimentally. In each shear layer of the hot jet flow, a wire of diameter 0.23 mm (0.015 jet width) is flexibly mounted along the spanwise direction. By flow visualization, temperature measurements, and spectral analysis, the study demonstrates that the wires have quite different effects on the jet flow depending on that the wires are motionless or vibrating in the flow, and the shear layers of the heated plane jet can be manipulated by means of flexible wires.

A note on the conservation of the axial momentum of a turbulent jet

1978 ◽  
Vol 87 (1) ◽  
pp. 55-63 ◽  
Author(s):  
Nikolas E. Kotsovinos
Keyword(s):  
Conservation Law ◽  
Momentum Flux ◽  
Pressure Field ◽  
Jet Flow ◽  
Experimental Results ◽  
Turbulent Jet ◽  
Ambient Fluid ◽  
Induced Flow ◽  
Plane Jet ◽  
Direction Opposite

The conservation law for the flux of axial momentum in a turbulent jet is examined. The examination discloses that for a plane jet out of a wall the momentum flux is reduced appreciably because the induced flow towards the jet has a component in the direction opposite to the main jet flow and because of the pressure field generated in the ambient fluid. Existing experimental results confirm this conclusion.

Instability Modal Behavior of the Acoustically Excited Impinging Plane Jet With a Small Cylinder

2004 ◽  
Vol 20 (2) ◽  
pp. 145-157 ◽  
Author(s):  
Fei-Bin Hsiao ◽  
I-Che Hsu ◽  
Cheng-Chiang Hsu
Keyword(s):  
Flow Field ◽  
Coherent Structures ◽  
Nozzle Exit ◽  
Near Field ◽  
Jet Flow ◽  
Core Region ◽  
Far Field ◽  
Potential Core ◽  
Modal Behavior ◽  
Small Cylinder

AbstractThe Instability modal behavior of coherent structures in a jet-small cylinder impinging flow field is extensively studied by hot-wire anemometry measurements. The free jet is employed with a small cylinder of 3 mm in diameter located in the potential core region at the impinging length of L/H = 1.5 for the near field impingement and L/H = 4 for the far field impingement. The jet exit velocity is operated at 10 m/sec with the Reynolds number of 1.03 × 104 based on the nozzle exit width H = 15mm. The impinging jet is locally excited at the nozzle exit with varicose mode (m =0) and sinuous mode (m = 1) disturbances at the fundamental frequency of the natural jet flow. Data indicate that the jet flow is greatly altered and significantly enhanced by strengthening the coherent structures of the flow due to resonance according to the feedback mechanism. Although the original natural jet preferably exhibits the varicose mode, the strong sinuous mode is dominant in the flow field owing to the presence of the small cylinder in the potential core region. In the near field impingement, the wake region behind the cylinder preserves the pure sinuous mode to where the jet vortices merge and then mildly fades out. Whereas in the jet shear layer, the sinuous mode exists in the initial portion and gradually transforms to the varicose mode. In the far field impingement, the alternate mode dominates in each frequency stage in pure impinging case and the modal behavior follows the selected mode with the introducing acoustic waves in the acoustic excitation cases.

Vortex dynamics and energy transport of a plane jet impinging upon a small cylinder

2002 ◽  
Vol 26 (5) ◽  
pp. 445-454 ◽  
Author(s):  
Ya-Wen Chou ◽  
Fei-Bin Hsiao ◽  
Cheng-Chiang Hsu ◽  
Jiann-Min Huang
Keyword(s):  
Vortex Dynamics ◽  
Energy Transport ◽  
Plane Jet ◽  
Small Cylinder

Scale-by-scale energy transfer in a dual-plane jet flow

2020 ◽  
Vol 32 (10) ◽  
pp. 105107
Author(s):  
Keli Hao ◽  
Koji Nagata ◽  
Yi Zhou
Keyword(s):  
Energy Transfer ◽  
Jet Flow ◽  
Dual Plane ◽  
Plane Jet

scholarly journals Effects of nanoparticle volume fraction in hydrodynamic and thermal characteristics of forced plane jet

2012 ◽  
Vol 16 (2) ◽  
pp. 455-468 ◽  
Author(s):  
T. Armaghani ◽  
M.J. Maghrebi ◽  
F. Talebi
Keyword(s):  
Numerical Simulation ◽  
Volume Fraction ◽  
Solid Volume Fraction ◽  
Thermal Characteristics ◽  
Time History ◽  
Jet Flow ◽  
Nanoparticle Volume Fraction ◽  
Reynolds Stresses ◽  
Velocity Amplitude ◽  
Plane Jet

The effects of nanoparticle volume fraction in hydrodynamic and thermal characteristics of an incompressible forced 2-D plane jet flow are investigated. Direct Numerical Simulation (DNS) of a two dimensional incompressible plane forced jet flow for two nanofluids has been performed. The base fluid is water and the nanoparticles are Al O ,CuO 2 3 . The numerical simulation is carried out for the solid volume fraction between 0 to 4%. The results for both nanofluids indicate that any increase in the solid volume fraction decreases the amplitude of temperature, velocity time histories, the turbulent intensities and that of the Reynolds stresses. The results for both two nanoparticles also indicate that with any increase in nanoparticle volume fraction, the velocity amplitude of velocity time history, the turbulent intensities and Reynolds stress in 2 3 Al O -water are greater than that ofCuO-water nanofluid.

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