Vortex structure and heat transfer in the stagnation region of an impinging plane jet (simultaneous measurements of velocity and temperature fields by digital particle image velocimetry and laser-induced fluorescence)

1997 ◽  
Vol 40 (13) ◽  
pp. 3163-3176 ◽  
Author(s):  
Jun Sakakibara ◽  
Koichi Hishida ◽  
Masanobu Maeda
Keyword(s):  
Heat Transfer ◽  
Particle Image ◽  
Laser Induced Fluorescence ◽  
Digital Particle Image Velocimetry ◽  
Temperature Fields ◽  
Stagnation Region ◽  
Simultaneous Measurements ◽  
Image Velocimetry ◽  
Velocity And Temperature Fields ◽  
Plane Jet

scholarly journals Experimental Study of Heat Convection From Stationary and Oscillating Circular Cylinder in Cross Flow

2000 ◽  
Vol 123 (1) ◽  
pp. 51-62 ◽  
Author(s):  
H. G. Park ◽  
Morteza Gharib
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Particle Image ◽  
Forced Oscillation ◽  
Oscillation Amplitude ◽  
Cross Flow ◽  
Digital Particle Image Velocimetry ◽  
Image Velocimetry ◽  
Vortex Shedding Frequency ◽  
Shedding Frequency

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.

scholarly journals Temperature and Velocity Behaviour During Melting of a PCM in a Uniformly Heated Circular Cavity

2020 ◽  
Author(s):  
Kyle Teather ◽  
Kamran Siddiqui
Keyword(s):  
Heat Transfer ◽  
Particle Image ◽  
Heating Temperature ◽  
Temperature Fields ◽  
Velocity Magnitude ◽  
Image Velocimetry ◽  
Transient Velocity ◽  
Convective Cells ◽  
Temperature And Velocity Fields

Abstract This study is focused on the detailed characterization of the transient velocity and temperature fields of a PCM enclosed in a circular geometry subjected to uniform external heating. Temperature data was collected using a grid of thermocouples protruding through the transaxial wall into the PCM cavity. Particle image velocimetry (PIV) was used to collect velocity data within the melted PCM to study the buoyancy-driven convective heat transfer. Experiments were conducted at three heating conditions. The results show symmetric behaviour of temperature and velocity fields and show strong convective cells. The results also show that the velocity magnitude and its behaviour influenced the temperature field and hence the heat transfer rate.

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