Particle Image Velocimetry Measurements of Standing Wave Kinematics in Vicinity of a Rigid Vertical Wall

2019 ◽  
Vol 62 (2) ◽  
pp. 277-282 ◽  
Author(s):  
M. Paprota
Keyword(s):  
Particle Image Velocimetry ◽  
Standing Wave ◽  
Particle Image ◽  
Vertical Wall ◽  
Wave Kinematics ◽  
Image Velocimetry

Characterization of Convection Patterns During the Solidification Process Using Particle Image Velocimetry

2003 ◽  
Author(s):  
C. Ghenai ◽  
R. K. Duggirala ◽  
C. X. Lin ◽  
M. A. Ebadian
Keyword(s):  
Particle Image Velocimetry ◽  
Temperature Distribution ◽  
Ammonium Chloride ◽  
Particle Image ◽  
Vertical Wall ◽  
Solidification Process ◽  
Convection Flow ◽  
Initial Concentration ◽  
Image Velocimetry ◽  
Convection Patterns

This experimental study focused mainly on the solidification of a binary mixture of ammonium chloride and water (NH4Cl-H2O) in a differentially heated cavity. One vertical wall is cooled at temperature TC, and the opposite vertical wall is kept at constant temperature TH = +20°C. The effect on the solidification process of the initial concentration of ammonium chloride and cooling conditions is examined. Particle image velocimetry (PIV) is used for the visualization of the dynamic field during the solidification process. The temperature distribution at discrete locations in the solution and on the vertical cooling wall was monitored using thermocouples. The convection flow patterns, the ice thickness, and the temperature distribution were obtained for various initial concentrations of ammonium chloride ranging from 0wt% to 20wt% (sub-eutectic and near-eutectic growth). The convection patterns obtained for different initial concentrations showed significant differences. The results showed that the process of solidification is slower with an increase in the initial concentration levels of the binary solution. The ice growth rate was almost double at the bottom of the cavity.

Wave-in-Deck Impact Loads in Relation With Wave Kinematics

2017 ◽  
Author(s):  
Jule Scharnke ◽  
Rene Lindeboom ◽  
Bulent Duz
Keyword(s):  
Particle Image Velocimetry ◽  
Particle Image ◽  
Impact Load ◽  
Breaking Waves ◽  
Offshore Structures ◽  
Small Scale ◽  
Impact Loads ◽  
Piv Measurements ◽  
Wave Kinematics ◽  
Image Velocimetry

Breaking waves have been studied for many decades and are still of interest as these waves contribute significantly to the dynamics and loading of offshore structures. In current MARIN research this awareness has led to the setup of an experiment to determine the kinematics of breaking waves using Particle Image Velocimetry (PIV). The purpose of the measurement campaign is to determine the evolution of the kinematics of breaking focussed waves. In addition to the PIV measurements in waves, small scale wave-in-deck impact load measurements on a fixed deck box were carried out in the same wave conditions. To investigate the link between wave kinematics and wave-in-deck impact loads, simplified loading models for estimating horizontal deck impact loads were applied and compared to the measured impact loads. In this paper, the comparison of the model test data to estimated loads is presented.

Acoustic streaming measurements in standing wave resonator using Particle Image Velocimetry

Wave Motion ◽  
2014 ◽  
Vol 51 (8) ◽  
pp. 1288-1297 ◽  
Author(s):  
Emeline Saint Ellier ◽  
Wissal Kdous ◽  
Yannick Bailly ◽  
Laurent Girardot ◽  
David Ramel ◽  
...  
Keyword(s):  
Particle Image Velocimetry ◽  
Standing Wave ◽  
Particle Image ◽  
Acoustic Streaming ◽  
Wave Resonator ◽  
Image Velocimetry

Investigation of the Velocity Profiles in a Ninety-Degree Curved Standing Wave Resonator with Particle Image Velocimetry

2013 ◽  
Vol 388 ◽  
pp. 8-12 ◽  
Author(s):  
Normah Mohd Ghazali ◽  
Irfan Abd Rahim ◽  
Terry Quenet ◽  
Zaki Ab Muin
Keyword(s):  
Particle Image Velocimetry ◽  
Standing Wave ◽  
Particle Image ◽  
Velocity Profiles ◽  
Travelling Wave ◽  
Straight Tube ◽  
Heat Engines ◽  
Quarter Wavelength ◽  
Wave Resonator ◽  
Image Velocimetry

Travelling wave thermoacoustic heat engines have been reported to have a higher efficiency than the standing wave ones. The former are generally large systems which consist of toroidal shape resonators. While standing wave heat engines are inherently smaller, a reduction in size could be considered which may involve curvatures as compared to the straight tube conventional systems. However, as with the streaming losses in the travelling wave resonators, losses due to the curvature may be generated. This study involves preliminary experimental measurements using the Particle Image Velocimetry (PIV) method to analyze the velocity profiles in a standing wave resonator before and after a ninety degree curvature. This design can reduce the space generally occupied by the straight standing wave resonator. The overall length of the resonator fits a quarter wavelength wave based on the straight closed-end tube type. The working gas is air at 1 atmospheric pressure. Results have shown that the velocity profiles after the stack but before the curvature exhibit clear straight paths up just as reported elsewhere. Signs of disordered motion could be observed just before the bend and the pattern continues until after the curvature. The results are obtained before one periodic cycle and before the acoustic wave front hit the tube end. The trend is expected to affect the overall thermoacoustic performance of the engine as returning gas particles interact with the oncoming particles that pass by the curvature.

Sign in / Sign up

Export Citation Format

Share Document