Experimental study of turbulent cross-flow in a staggered tube bundle using particle image velocimetry

An experimental study is made on the processes of heat transfer from the surface of a forced oscillating cylinder in a crossflow. A range of oscillation amplitude A/D=0.1,0.2, forced oscillation frequency 0<Stc<1, and Reynolds number (Re=550, 1100, 3500) is covered in water Pr=6. Besides the increase at the natural vortex shedding frequency, large increases in the heat transfer are found at certain superharmonics. By using Digital Particle Image Velocimetry/Thermometry (DPIV/T), the increase in the heat transfer rate is found to correlate inversely with the distance at which vortices roll-up behind the cylinder, i.e., the distance decreases when the heat transfer increases. The cause of the increase is found to be the removal of the stagnant and low heat convecting fluid at the base of the cylinder during the roll-up of the vortices.

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Investigation of Cathodic-Arc-Jet Influence on Cross Flow using Particle Image Velocimetry

46th AIAA Plasmadynamics and Lasers Conference ◽

10.2514/6.2015-2806 ◽

2015 ◽

Cited By ~ 1

Author(s):

Igal Kronhaus

Keyword(s):

Particle Image Velocimetry ◽

Particle Image ◽

Cross Flow ◽

Image Velocimetry ◽

Cathodic Arc

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Experimental study of vorticity-strain rate interaction in turbulent partially premixed jet flames using tomographic particle image velocimetry

Physics of Fluids ◽

10.1063/1.4941528 ◽

2016 ◽

Vol 28 (2) ◽

pp. 025109 ◽

Cited By ~ 14

Author(s):

Bruno Coriton ◽

Jonathan H. Frank

Keyword(s):

Experimental Study ◽

Particle Image Velocimetry ◽

Strain Rate ◽

Particle Image ◽

Tomographic Particle Image Velocimetry ◽

Jet Flames ◽

Image Velocimetry ◽

Partially Premixed ◽

Rate Interaction

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A Flow Study of Pulsed Jet Cross-Flow Interaction by Micro Particle Image Velocimetry

Fluids Engineering ◽

10.1115/imece2006-14195 ◽

2006 ◽

Author(s):

Kenichi Watanabe ◽

Tomonori Nakatsuka ◽

Daichi Suzuki ◽

Takashi Nagumo ◽

Masahiro Motosuke ◽

...

Keyword(s):

Reynolds Number ◽

Particle Image Velocimetry ◽

Flow Control ◽

Particle Image ◽

Low Reynolds Number ◽

Cross Flow ◽

Synthetic Jet ◽

Pulsed Jet ◽

Micro Particle Image Velocimetry ◽

Image Velocimetry

Recent development of micro devices is remarkable as in the examples of Micro-TAS, Lab-on-a-chip or ultra micro gas turbine. In order to make the micro devices smaller and more effective, an appropriate use of a micro scale jet as an actuator can be a key technology. Aiming at the development of a measurement system of the micro flow control devices in the future micro aerodynamics, we have established a system to measure a continuous jet, a pulsed jet and a synthetic jet for the flow control in the low Reynolds number air flow with a micro length scale. The two-dimensional flow field around the micro jet using micro particle image velocimetry (PIV) was measured. The jet was injected through the device using an acoustic speaker. It was observed that a saddle point existed at the certain phase where the velocity is 0 at the boundary of the jet blowing and suction phase for the synthetic jet into a still air. It was found that the pulsed jet and the synthetic jet are more effective in the fluid mixing in the low Reynolds number flow than the continuous jet. The dead water region was observed downstream of the jet in case of the jet injection into cross flow. It was recognized that the synthetic jet at the certain oscillation frequency generated a vortex pair near the jet hole.

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