Experimental investigation on the microprocess of hydrate particle agglomeration using a high-speed camera

2018 ◽

Author(s):

Shengjun Zhou ◽

Haiwang Li ◽

Zhi Tao ◽

Ruquan You ◽

Haoyu Duan

Keyword(s):

Boundary Layer ◽

Experimental Investigation ◽

Laser Diode ◽

High Speed ◽

Flow Behavior ◽

Particle Image Velocimetry System ◽

Main Stream ◽

High Speed Camera ◽

Time Resolved ◽

Rotating Channel

In the current study, the influence of different rotation conditions on the flow behavior is experimentally investigated by a new system which is designed for time-resolved PIV measurements of the smooth channels at rotation conditions. The Reynolds number equals 15000 and the rotation number ranges from 0 to 0.392 with an interval of 0.098. This new time-resolved Particle Image Velocimetry system consists of a 10 Watts continuous laser diode and a high-speed camera. The laser diode can provide a less than 1mm thickness sheet light. 6400 frames can be captured in one second by the high-speed camera. These two parts of the system are fixed on a rotating disk. In this case, the relative velocity of flows in the rotating smooth square channel can be measured directly to reduce the measurement error. This system makes high-speed camera close to the rotating channel, which allows a high resolution for the measurements of main stream. In addition, high accuracy and temporal resolution realize a detailed analysis of boundary layer characteristics in rotation conditions. Based on this system, experimental investigation has been undertaken. Results are presented of the evolution of velocity and boundary layer thickness at various rotation numbers and different circumferential positions.

Download Full-text

Experimental investigation of the boundary condition of slewing beams using a high-speed camera system

Mechanism and Machine Theory ◽

10.1016/0094-114x(94)00058-s ◽

1995 ◽

Vol 30 (4) ◽

pp. 629-643 ◽

Cited By ~ 9

Author(s):

K.H. Low ◽

Michael W.S. Lau

Keyword(s):

Boundary Condition ◽

Experimental Investigation ◽

High Speed ◽

High Speed Camera ◽

Camera System

Download Full-text

Experiments on the Injection of Elliptical Liquid Jets Into a Low Speed Airflow

Volume 3: Fluid Machinery; Erosion, Slurry, Sedimentation; Experimental, Multiscale, and Numerical Methods for Multiphase Flows; Gas-Liquid, Gas-Solid, and Liquid-Solid Flows; Performance of Multiphase Flow Systems; Micro/Nano-Fluidics ◽

10.1115/fedsm2018-83157 ◽

2018 ◽

Author(s):

Yosef Rezaei ◽

Mehran Tadjfar

Keyword(s):

Experimental Investigation ◽

Weber Number ◽

Momentum Flux ◽

High Speed ◽

Flux Ratio ◽

Major Axis ◽

Liquid Jets ◽

Liquid Jet ◽

High Speed Camera ◽

Subsonic Crossflow

An experimental investigation was performed to study the physics of liquid jets injected into a low subsonic crossflow. The jets are issued from elliptical and circular injectors with equivalent exit area. The liquid jet was visualized using shadowgraph technique and a high speed camera was used to record the instantaneous status of the jet. The liquid / air momentum flux ratio and air Weber number were varied to examine their effects on different parameters of the flow like liquid jet column trajectory, breakup point and breakup regimes. The major axis of the elliptical nozzle was aligned parallel and perpendicular to the air crossflow direction. Two different breakup modes were observed, column breakup and bag breakup. Based on the obtained results some characteristics of injected liquid jets into the air crossflow such as penetration depth and the trajectory of liquid jet were affected by changing the nozzle exit shape.

Download Full-text

Experimental Investigation on Droplet Cooling of Brakes

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.592-594.1585 ◽

2014 ◽

Vol 592-594 ◽

pp. 1585-1589 ◽

Cited By ~ 2

Author(s):

K. Kathiresan ◽

J. Adhavan ◽

M. Venkatesan

Keyword(s):

Experimental Investigation ◽

High Speed ◽

Data Acquisition System ◽

High Speed Camera ◽

Brake Pad ◽

Syringe Pump ◽

Online Data ◽

Braking System ◽

Cartridge Heater ◽

Scanning Electron

Braking system is one of the important systems in Automobiles. It is essential to decelerate the vehicle and stop it when essential. The temperature of the brake pad (stator) and disc (rotor) increases because of frictional force between them. Higher temperatures may lead to brake fading or failure of braking system. In the present study droplet cooling of commercially available Brake pad is analyzed with surface temperatures in the range of 80°C - 150°C. The brake pad material analyzed is a composite material with Fe2O3, BaO, CaO, SiO2, SO3 and MgO as major constituents. The percentage of the constituents are found using Scanning Electron Microscope (SEM). The brake pad is artificially heated using cartridge heater and a fixed volume of water is dropped on to the brake pad surface using a syringe pump. The characteristics of droplet on the surface of the brake pad are recorded using a High speed camera. The temperature is measured continuously using a K type thermocouple and is recorded using an online data acquisition system. The characteristic of droplet enhanced cooling is presented.

Download Full-text

Experimental Investigation on the Effect of Bubble Behavior on Flow Boiling Pressure Drop in Narrow Channel

Volume 3: Thermal-Hydraulics; Turbines, Generators, and Auxiliaries ◽

10.1115/icone20-power2012-54295 ◽

2012 ◽

Author(s):

Deqi Chen ◽

Ren Song ◽

Liang-ming Pan

Keyword(s):

Experimental Investigation ◽

Pressure Drop ◽

Void Fraction ◽

High Speed ◽

Channel Wall ◽

Flow Boiling ◽

Narrow Channel ◽

High Speed Camera ◽

Bubble Behavior ◽

Channel Dimension

Bubble behavior in narrow channel can be quite different with that in conventional channel. When the bubble reaches a size which is comparable with the channel dimension, the bubble is confined by the channel wall. This influences the bubble evolution significantly in the narrow channel. Then the characteristics of pressure drop in the narrow channel is affected significantly. In order to investigate the effect of bubble behavior on flow boiling pressure drop, a visual study was carried out with a high speed camera (5,000 frame per second was used) to record the bubble behavior. It is found that the OSV (Onset of Significant Vapor) emerges much earlier in narrow channel when comparing with that in conventional channel. A revised correlation for prediction of the real void fraction is proposed based on the experimental investigation. It is also found that the bubble behavior affects the pressure drop in narrow channel significantly, and the channel will be blocked easily when the confined vapor cluster appears. The pressure drop, however, dose not increase linearly with increasing void fraction, and the minimum pressure drop occurs with 60% void fraction. With increasing void fraction, the bubble behavior is more intense and turbulent, which induces more severe fluctuation in pressure drop.

Download Full-text

Experimental Investigation on the Arc Characteristics and Arc Quenching Capabilities of C5F10O-CO2 Mixtures

Plasma Physics and Technology Journal ◽

10.14311/ppt.2019.3.231 ◽

2019 ◽

Vol 6 (3) ◽

pp. 231-234

Author(s):

Z. Guo ◽

F. Tang ◽

Q. Lv ◽

X. Li ◽

B. Zhang ◽

...

Keyword(s):

Experimental Investigation ◽

High Speed ◽

Inverse Transformation ◽

High Speed Camera ◽

Two Dimensional ◽

Circuit Breakers ◽

Arc Voltage ◽

Arc Characteristics ◽

Dimensional Distribution ◽

The Stability

C5F10O-CO2 mixtures are possible alternatives to SF6 - which has a high global warming potential - as the interruption medium in gas circuit breakers. This paper experimentally studies the arcing characteristics of C5F10O-CO2 mixture, with an experimental model with viewing windows, and measures the arc voltage, current and emission spectrum. The arc evolution process is captured with a high speed camera through an inspection window. The two-dimensional distribution of arc is obtained and analyzed by the inverse transformation of Abel. The results show that, the C5F10O-CO2 mixture arc is more volatile than SF6 gas, and adding C5F10O into CO2 improves the stability of the arc, and significantly reduces the arc temperature.

Download Full-text

Experimental Investigation on the Effect of Container Geometry Change to Liquid Sloshing

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.165.160 ◽

2012 ◽

Vol 165 ◽

pp. 160-164

Author(s):

Irwan Mohd Azmi Mohd ◽

Mohd Nur Azmi Nordin ◽

Muhammad Syahrail Mahmud ◽

Azma Putra ◽

Abdul Munir Fudhail ◽

...

Keyword(s):

Experimental Investigation ◽

High Speed ◽

Structural Integrity ◽

Liquid Surface ◽

Characteristic Length ◽

Free Liquid Surface ◽

Liquid Sloshing ◽

High Speed Camera ◽

Surface Level ◽

Level Change

Liquid sloshing is any motion of free liquid surface inside its container. Sloshing may generate hydrodynamics loads that can be dangerous to structural integrity and stability of moving container. In this study, liquid sloshing in cubical and cylindrical containers with similar characteristic length were investigated. The containers with liquid inside were excited sinusoidally by using an electrodynamics shaker while the free liquid surface level change was captured by using high speed camera. The highest free liquid surface level difference obtained for cylindrical and cubical containers were compared. Results show that cylindrical containers produce less liquid sloshing and thus more suitable to be used for liquid transportation.

Download Full-text