High-Speed Imaging System for Droplet Collision and Unsteady Combustion Studies

2004 ◽  
Author(s):  
Chung K. Law
Keyword(s):  
High Speed ◽  
Imaging System ◽  
Unsteady Combustion ◽  
High Speed Imaging ◽  
Droplet Collision

scholarly journals Experimental study of the dynamic behaviour of High Performance Concrete (HPC) under tensile loading

2018 ◽  
Vol 183 ◽  
pp. 02043 ◽  
Author(s):  
Bratislav Lukić ◽  
Dominique Saletti ◽  
Pascal Forquin
Keyword(s):  
High Speed ◽  
High Performance ◽  
High Performance Concrete ◽  
Imaging System ◽  
Spall Strength ◽  
High Speed Imaging ◽  
Dynamic Tensile Strength ◽  
Full Field ◽  
Local Point ◽  
Measurement Results

This paper presents the measurement results of the dynamic tensile strength of a High Performance Concrete (HPC) obtained using full-field identification method. An ultra-high speed imaging system and the virtual fields method were used to obtain this information. Furthermore the measurement results were compared with the local point-wise measurement to validate the data pressing. The obtained spall strength was found to be consistently 20% lower than the one obtained when the Novikov formula is used.

Nucleate Boiling From Micro-Machined Surfaces

2003 ◽  
Author(s):  
Adrian M. Holland ◽  
Colin P. Garner
Keyword(s):  
Heat Transfer ◽  
High Speed ◽  
Imaging System ◽  
Laser System ◽  
Ccd Camera ◽  
Nucleate Boiling ◽  
Heat Fluxes ◽  
Frame Rate ◽  
High Speed Imaging ◽  
Machined Surfaces

This paper discusses the production and use of laser-machined surfaces that provide enhanced nucleate boiling and heat transfer characteristics. The surface features of heated plates are known to have a significant effect on nucleate boiling heat transfer and bubble growth dynamics. Nucleate boiling starts from discrete bubbles that form on surface imperfections, such as cavities or scratches. The gas or vapours trapped in these imperfections serve as nuclei for the bubbles. After inception, the bubbles grow to a certain size and depart from the surface. In this work, special heated surfaces were manufactured by laser machining cavities into polished aluminium plates. This was accomplished with a Nd:YAG laser system, which allowed drilling of cavities of a known diameter. The size range of cavities was 20 to 250 micrometers. The resulting nucleate pool boiling was analysed using a novel high-speed imaging system comprising an infrared laser and high resolution CCD camera. This system was operated up to a 2 kHz frame rate and digital image processing allowed bubbles to be analysed statistically in terms of departure diameter, departure frequency, growth rate, shape and velocity. Data was obtained for heat fluxes up to 60 kW.m−2. Bubble measurements were obtained working with water at atmospheric pressure. The surface cavity diameters were selected to control the temperature at which vapour bubbles started to grow on the surface. The selected size and spacing of the cavities was also explored to provide optimal heat transfer.

scholarly journals Low-Cost High-Speed Imaging System for Observing Vocal Fold Vibration in Voice Disorders

ORL ◽  
2012 ◽  
Vol 74 (4) ◽  
pp. 208-210 ◽  
Author(s):  
Kenichi Kaneko ◽  
Koichi Sakaguchi ◽  
Masato Inoue ◽  
Haruo Takahashi
Keyword(s):  
Vocal Fold ◽  
High Speed ◽  
Imaging System ◽  
Low Cost ◽  
Voice Disorders ◽  
High Speed Imaging ◽  
Vocal Fold Vibration

Velocity Measurements Using High-Speed Imaging System for Impact Test

2014 ◽  
Vol 903 ◽  
pp. 187-193 ◽  
Author(s):  
Abdul Aziz Jaafar ◽  
Anwar P.P. Abdul Majeed ◽  
S.M. Sapuan ◽  
Shahnor Basri
Keyword(s):  
High Speed ◽  
Impact Test ◽  
Imaging System ◽  
Velocity Measurements ◽  
Glass Composite ◽  
Free Flight ◽  
High Speed Imaging ◽  
Fibre Glass ◽  
System A ◽  
Kinematic Properties

This paper presents the velocity measurements for an impact test on a laminated fibre-glass composite plate. The free flight kinematic properties of a blunt-nosed cylindrical projectile on the upstream and downstream of a test coupon were measured using a high-speed camera imaging system. A visual geometric detection technique is discussed and it is shown that the uncertainties of velocity measurements are associated with an imposed constraint on the camera viewing area and shutter speed.

Visualization of Oil Droplets Distribution in a Rotary Compressor

2019 ◽  
Author(s):  
Puyuan Wu ◽  
Jun Chen ◽  
Paul E. Sojka
Keyword(s):  
Multiphase Flow ◽  
High Speed ◽  
Imaging System ◽  
Discharge Rate ◽  
Current Phase ◽  
Rotary Compressor ◽  
Cfd Analysis ◽  
High Speed Imaging ◽  
Oil Droplets ◽  
Rolling Piston

Abstract A rotary compressor relies on an eccentric rolling piston, which rotates at high speed, to compress gas in the compression chamber. The oil in the rotary compressor is used for lubricating the bearing and sealing the clearance of sliding parts. However, the oil can exhaust from the rotary compressor by the refrigerant flow and reduce the reliability of the compressor as a result. Thus, studying the behavior of oil droplets distribution in a rotary compressor is a major challenge for manufacturers who rely on CFD tools to predict the multiphase flow. By modifying a rotary compressor, the oil behavior inside the cylinder is observed and recorded by a high-speed imaging system. In the current phase, multiple targeted locations, including the space between the bearing housing and the stator, and the space above the stator are measured in different conditions. The number, size, velocity, and morphology of oil droplets are analyzed based on multiple snapshots. The result can assist designers in improving the CFD analysis of compressors and ultimately reducing the oil discharge rate (ODR).

A visible light high-speed imaging system and tomographic reconstruction of plasma emissivity on the J-TEXT tokamak

2019 ◽  
Vol 146 ◽  
pp. 578-581
Author(s):  
Minghui Xia ◽  
Zhipeng Chen ◽  
Huapu Deng ◽  
Jie Yang ◽  
Lizhi Zhu ◽  
...  
Keyword(s):  
Visible Light ◽  
High Speed ◽  
Imaging System ◽  
Tomographic Reconstruction ◽  
High Speed Imaging

scholarly journals A smart position optimization scheme for badminton doubles based on human–computer interactive training in wireless sensor networks

2020 ◽  
Vol 2020 (1) ◽  
Author(s):  
Bo Yao ◽  
Na Liang
Keyword(s):  
High Speed ◽  
Imaging System ◽  
Service Industries ◽  
Human Computer Interactions ◽  
High Speed Imaging ◽  
Interactive Training ◽  
Robot Intelligence ◽  
Aerospace Medical ◽  
The Relationship ◽  
Site Training

AbstractIn the continuous development process, robot technology based on multimedia interactions has been widely used in aerospace, medical, education and service industries. The relationship between robots and humans is getting closer. The improvement of robot intelligence is a process of continuously learning the outside world. Since 1959, multimedia human–computer interaction technology has provided more and more technical support for human research robots. In this paper, we firstly study the characteristics of badminton competition, including the technical characteristics, tactics characteristics, and the collection requirements about on-site training. The technical description of the badminton doubles station is also completed. Furthermore, in terms of the digitalization of the gait-based sensation, the automated acquisition of the gait technology, the simultaneously with the video, and the high-speed imaging system, the system implement information is integrated. After that, badminton multimedia techniques and tactics are designed based on the extensive statistical analysis. The skills and tactics of athletes are expressed in the form of video, graphics and text. Finally, the operators can carry out the technical and tactical analysis processes through good human–computer interactions. This increases the end user’s game information. The related attention and understanding can strengthen the strength and depth of technical and tactical ability analysis. Thus, we propose the station optimization plan for badminton doubles.

Soil Throwing Experiments for Reverse Rotary Tillage at Various Depths, Travel Speeds, and Rotational Speeds

2017 ◽  
Vol 60 (4) ◽  
pp. 1113-1121 ◽  
Author(s):  
Jianmin Gao ◽  
Huidong Qi
Keyword(s):  
High Speed ◽  
Imaging System ◽  
Travel Speed ◽  
Reverse Direction ◽  
Regression Equations ◽  
High Speed Imaging ◽  
Soil Particles ◽  
Rotor Shaft ◽  
Tillage System ◽  
Save Energy

Abstract. Submerged reverse rotary tillage was presented decades ago as a way to save energy in deep tillage, but its application was limited because it throws the tilled soil forward. The forward-thrown soil gets re-tilled, resulting in wasted energy. To understand the soil throwing process during reverse rotary tillage, a theoretical soil throwing model was established, but that model was investigated by few tests. How soil is thrown by a submerged reverse rotary tillage system is, as yet, not clear. To optimally design a submerged reverse rotary tiller, it is necessary to reveal how soil is thrown by rotary blades operating in the reverse direction. In this study, a high-speed imaging system was used to track reverse rotary tilled soil particles. Trails of soil particles from the top and middle layers of tilling were computed by regression methods. Furthermore, the original soil throwing angles and the maximum soil throwing heights were acquired by the regression equations. Experimental results revealed that the depth of the rotor shaft strongly influenced the backward-thrown soil ratio, but the travel speed and rotational speed only slightly influenced the backward-thrown soil ratio. The average original soil throwing angle decreased with rotor depth. The soil clods in the top layer had a stronger backward trend. Furthermore, a soil throwing model of reverse rotary tillage is proposed. By applying this model, some phenomena (e.g., the ratio of backward-thrown soil to forward-thrown soil at varying rotor depths) could be interpreted. Test results indicated that the assumption that tilled soil clods would be thrown along their crack direction in a reverse tillage system may be reasonable. Keywords: Rotary tiller, Rotor shaft submerged depth, Soil throwing, Speed, Submerged reverse rotary tillage.

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