scholarly journals Experimental investigation into the impact of a liquid droplet onto a granular bed using three-dimensional, time-resolved, particle tracking

2014 ◽  
Vol 89 (3) ◽  
Author(s):  
Edward J. Long ◽  
Graham K. Hargrave ◽  
James R. Cooper ◽  
Ben G. B. Kitchener ◽  
Anthony J. Parsons ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Particle Tracking ◽  
Liquid Droplet ◽  
Three Dimensional ◽  
Granular Bed ◽  
Time Resolved ◽  
The Impact

scholarly journals Holographic time-resolved particle tracking by means of three-dimensional volumetric deconvolution

2014 ◽  
Vol 22 (17) ◽  
pp. 20994 ◽  
Author(s):  
Tatiana Latychevskaia ◽  
Hans-Werner Fink
Keyword(s):  
Particle Tracking ◽  
Three Dimensional ◽  
Time Resolved

THE MECHANISM OF SHOCK COMMINUTION OF 3D C/SIC COMPOSITE SUBJECTED TO HIGH VELOCITY IMPACT

2008 ◽  
Vol 22 (09n11) ◽  
pp. 1510-1517
Author(s):  
QINGMING ZHANG ◽  
FENGLEI HUANG ◽  
LI CHEN ◽  
LIMING HAN ◽  
JINZHU LI
Keyword(s):  
Experimental Investigation ◽  
High Velocity ◽  
Ceramic Matrix Composite ◽  
Three Dimensional ◽  
Ceramic Matrix ◽  
Impact Point ◽  
High Velocity Impact ◽  
Velocity Impact ◽  
Sic Ceramic ◽  
The Impact

In this paper, experimental investigation and theoretical analysis are carried out in an attempt to study the response of SiC ceramic matrix composite reinforced with three dimensional braided fabric(3 D C/SiC ) under high velocity impact. The results show that 3 D C/SiC composite will be turned into comminution if the pressure of the impact point resulted from the projectile impacting 3 D C/SiC composite sample is larger than 780Mpa. Based on the analysis of the mechanism of composite comminution, a theoretical model has been developed.

scholarly journals Sound Pressure Level Spectra of Automotive Side-View Mirror Models Deduced From Time-Resolved Three-Dimensional Particle Tracking Velocimetry Data With Artificial Intelligence Based Data Assimilation Method

2020 ◽  
Author(s):  
Dong Kim ◽  
Arman Safdari ◽  
Kyung Chun Kim
Keyword(s):  
Artificial Intelligence ◽  
Data Assimilation ◽  
Particle Tracking ◽  
Particle Tracking Velocimetry ◽  
Three Dimensional ◽  
Sound Level ◽  
Time Resolved ◽  
Inference System ◽  
Noise Characteristics ◽  
Level Spectrum

Abstract This paper proposes a data assimilation method based on artificial intelligence (AI) to obtain sound level spectrum as increasing the spatial and temporal resolution of time-resolved three-dimensional Particle Tracking Velocimetry (4D PTV) data. A 4D PTV has used to measure flow characteristics of three side mirror models adopting the Shake-The-Box (STB) algorithm with four high-speed cameras on a robotic arm for measuring industrial scale. Helium filled soap bubbles are used as tracers in the wind tunnel experiment to characterize flow structures around automobile side mirror models. Full volumetric velocity fields and evolution of vortex structures are obtained and analyzed. Instantaneous pressure fields are deduced by solving a Poisson equation based on the 4D PTV data. To increase spatial and temporal resolutions of velocity field, artificial intelligence (AI)-based data assimilation method has applied. Adaptive Neural Fuzzy Inference System (ANFIS) based machine learning algorithm works well to find hidden 3D vortical structures behind the automobile side mirror model. Using the high resolution ANFIS model, power spectrum of velocity fluctuations and sound level spectrum of pressure fluctuations are successfully obtained to assess flow and noise characteristics of three different side mirror models.

Effect of Component Layout and Geometry on the Flow Distribution in Electronics Circuit Packs

1991 ◽  
Vol 113 (1) ◽  
pp. 50-57 ◽  
Author(s):  
K. Azar ◽  
E. T. Russell
Keyword(s):  
Experimental Investigation ◽  
Three Dimensional ◽  
Flow Distribution ◽  
Reynolds Numbers ◽  
Water Tunnel ◽  
Large Aspect Ratio ◽  
Electronic Components ◽  
Component Layout ◽  
Multiple Component ◽  
The Impact

An experimental investigation was conducted to study the impact of component layout and geometry on flow distribution on a circuit pack. The experiment was conducted in a water tunnel using aluminum blocks to simulate various electronic components. The experiments were conducted for laminar and onset of transition Reynolds numbers. Diluted ink was used as the flow visualization vehicle. The study looked at flow over single component, multiple component, and fully loaded circuit packs. The study drew a number of conclusions including the flows were highly three dimensional, and location and orientation of components with large aspect ratio will significantly affect circuit pack flow distribution.

An experimental investigation of the relative diffusion of particle pairs in three-dimensional turbulent flow

2000 ◽  
Vol 422 ◽  
pp. 207-223 ◽  
Author(s):  
SØREN OTT ◽  
JAKOB MANN
Keyword(s):  
Experimental Data ◽  
Experimental Investigation ◽  
Turbulent Flow ◽  
Particle Tracking ◽  
Three Dimensional ◽  
Direct Interaction ◽  
General Shape ◽  
Particle Pairs ◽  
Oscillating Grids ◽  
A Minor

The particle tracking (PT) technique is used to study turbulent diffusion of particle pairs in a three-dimensional turbulent flow generated by two oscillating grids. The experimental data show a range where the Richardson–Obukhov law 〈r2〉 = Cεt3 is satisfied, and the Richardson–Obukhov constant is found to be C = 0.5. A number of models predict much larger values. Furthermore, the distance–neighbour function is studied in detail in order to determine its general shape. The results are compared with the predictions of three models: Richardson (1926), Batchelor (1952) and Kraichnan (1966a). These three models predict different behaviours of the distance–neighbour function, and of the three, only Richardson's model is found to be consistent with the measurements. We have corrected a minor error in Kraichnan's (1996a) Lagrangian history direct interaction calculations with the result that we had to increase his theoretical value from C = 2.42 to C = 5.5.

Experimental investigation of freely falling thin disks. Part 1. The flow structures and Reynolds number effects on the zigzag motion

2013 ◽  
Vol 716 ◽  
pp. 228-250 ◽  
Author(s):  
Hongjie Zhong ◽  
Cunbiao Lee ◽  
Zhuang Su ◽  
Shiyi Chen ◽  
Mingde Zhou ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Reynolds Number ◽  
Degrees Of Freedom ◽  
Three Dimensional ◽  
Vortex Pair ◽  
Leading Edge ◽  
Circular Disk ◽  
Stereoscopic Vision ◽  
Time Resolved ◽  
Dipole Vortex

AbstractThis paper describes an experimental investigation of the dynamics of a freely falling thin circular disk in still water. The flow patterns of the disk zigzag motion are studied using dye visualization and particle image velocimetry. Time-resolved disk motions with six degrees of freedom are obtained with a stereoscopic vision method. The flow separation and vortex shedding are found to change with the Reynolds number, $\mathit{Re}$. At high Reynolds numbers a new dipole vortex is shed that is significantly different from Kármán-type vortices. The vortical structures are mainly composed of leading-edge vortices, a counter-rotating vortex pair and secondary trailing-edge vortices. The amplitude of the horizontal oscillation is also dependent on the Reynolds number with a critical Reynolds number ${\mathit{Re}}_{cr} \approx 2000$, where the oscillatory amplitude is proportional to $\mathit{Re}$ for $\mathit{Re}\lt {\mathit{Re}}_{cr} $, but becomes invariant for $\mathit{Re}\gt {\mathit{Re}}_{cr} $. Three-dimensional dipolar vortices were also observed experimentally.

scholarly journals Experimental Study of Laser Cladding Methods on Water Erosion Resistance to Low Pressure Blades Materials of Steam Turbine

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Di Zhang ◽  
Pengfei Zhao ◽  
Wei Zhao ◽  
Yaoyuan Luo ◽  
Yonghui Xie
Keyword(s):  
Laser Cladding ◽  
Liquid Droplet ◽  
Three Dimensional ◽  
Experimental System ◽  
Water Erosion ◽  
Substrate Material ◽  
Computing Methods ◽  
Laser Surface ◽  
Experimental Apparatus ◽  
The Impact

An experimental apparatus was built to study the effects of liquid-solid impact on laser cladding processing specimens of 17-4PH stainless steel material in the present investigation. Then the result of specimens without laser surface process was compared. The impact effect on the specimens was observed using the three-dimensional digital microscope. The depth of laser cladding and substrate material caused by liquid droplet impact was studied in detail and measured. The accuracy and reliability of the experimental system and computing methods were also verified. The depth of the impact area of laser cladding specimens was distributed in the range of 0.5–1.5 μm while the 17-4PH group was distributed in the range of 2.5–3.5 μm. In contrast with specimens without laser surface processing, the material processed by laser cladding has significantly higher resistance to water erosion.

Validating the Numerical Prediction of the Aerodynamics of an Axial Compressor

2014 ◽  
Author(s):  
Torben Wolff ◽  
Florian Herbst ◽  
Oliver Freund ◽  
Le Liu ◽  
Joerg R. Seume
Keyword(s):  
Pressure Ratio ◽  
Three Dimensional ◽  
Axial Compressor ◽  
Secondary Flows ◽  
Time Resolved ◽  
Prediction Quality ◽  
Numerical Predictions ◽  
Turbomachinery Design ◽  
The Impact

Numerical methods have become the basis for the aerodynamic design of turbomachinery in order to reduce the time for development cycles and associated cost. Designing modern axial compressors requires high confidence in the quality of numerical predictions. In terms of the aerodynamics, the loading of the blades as well as the efficiency targets constantly increase. Losses have to be predicted precisely and the impact of three-dimensional secondary flows, separation, and laminar-turbulent transition must be taken into account. In the present paper, the aerodynamic prediction quality of the state-of-the-art turbomachinery design code TRACE is validated against experimental data from a 2.5-stage axial compressor. The aerodynamic prediction quality is systematically investigated to determine errors and uncertainties regarding the discretization, turbulence and transition models, and importance of considering unsteady effects. Computations are performed for several operating points and the results are validated by means of the compressors integral pressure ratio as well as by means of local pneumatic probe measurements. It is shown that using the empirical γ–ReΘ model improves the prediction quality of the boundary layers and wake flows. Time-resolved computations at the design point of the compressor show that the strength and the losses of a corner separation in both vane rows are reduced to realistic levels when the periodic-unsteady interaction with the upstream wakes is considered. The generally good aerodynamic predictions for both local and integral experimental quantities qualify TRACE for aeroelastic predictions which are planned for the future.

Experimental Investigation of the Impact of Dual Time Periods on Crash Hazardous Location Identification

ICCTP 2011 ◽  
2011 ◽  
Author(s):  
Gilbert Leano ◽  
Wen Cheng ◽  
Xudong Jia ◽  
Lingqi Kong ◽  
Robert Brennan
Keyword(s):  
Experimental Investigation ◽  
Time Periods ◽  
Location Identification ◽  
The Impact
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