Experimental Investigation on Droplet Cooling of Brakes

2014 ◽  
Vol 592-594 ◽  
pp. 1585-1589 ◽  
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.

Experimental Investigation on Flow Field in a Rotating Channel With a New TR-PIV System

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.

scholarly journals Influence of Microbubble on Fine Wolframite Flotation

Minerals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1079
Author(s):  
Penggang Wei ◽  
Liuyi Ren ◽  
Yimin Zhang ◽  
Shenxu Bao
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Hydroxamic Acid ◽  
High Speed ◽  
High Speed Camera ◽  
Single Factor ◽  
Scanning Electron Microscopy Analysis ◽  
Electron Microscopy Analysis ◽  
Microscopy Analysis ◽  
Scanning Electron

The recovery of fine wolframite is low when using traditional flotation that does not use a microbubble. In this study, a microbubble was introduced into the fine wolframite flotation system; −20 μm wolframite was used as an experiment sample and octyl hydroxamic acid as the collector. The recovery of microbubble flotation reached 84.07%, which is about 12.04% higher than that of traditional flotation. A single-factor flotation experiment, high-speed camera analysis, and SEM (Scanning Electron Microscopy) analysis were used to study the influence of microbubbles on the flotation of fine wolframite. The results show that fine wolframite will more easily agglomerate under the action of microbubbles. The octyl hydroxamic acid adsorbed on the surface of wolframite treated with microbubbles is denser and more abundant.

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

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.

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

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.

scholarly journals From the microstructure of steels to the explosion of sparks

2019 ◽  
Vol 3 ◽  
pp. 2
Author(s):  
Anthony Guillen ◽  
Fang Goh ◽  
Julie Andre ◽  
Amaury Barral ◽  
Clement Brochet ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Internal Pressure ◽  
High Speed ◽  
High Speed Camera ◽  
Steel Microstructure ◽  
Linear Distance ◽  
The Common ◽  
Hypoeutectoid Steel ◽  
Scanning Electron

Sparks ejected by the grinding of steel can be observed to split in mid-flight. In this paper, we investigate the link between steel microstructure and the splitting behavior using two different steels: hypoeutectoid (containing less than 0:8% carbon) and hypereutectoid (>0:8% carbon). We used a high-speed camera filming at 1000 fps to observe the sparks, and a Scanning Electron Microscope to image the microstructures. For the hypoeutectoid steel, we also quantified the splitting behavior of the sparks by measuring the statistical distribution of the linear distance they travel before splitting occurs. We find that our results are coherent with the common explanation of the splitting phenomenon, stating that sparks split because their microstructures allow the formation of pockets of CO2 by oxidation of Fe3C, producing an internal pressure and leading to explosion.

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

Fuel ◽  
2019 ◽  
Vol 237 ◽  
pp. 475-485 ◽  
Author(s):  
GuangChun Song ◽  
YuXing Li ◽  
WuChang Wang ◽  
Shuai Liu ◽  
XiaoYu Wang ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
High Speed ◽  
High Speed Camera ◽  
Particle Agglomeration

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

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

C<sub>5</sub>F<sub>10</sub>O-CO<sub>2</sub> mixtures are possible alternatives to SF<sub>6</sub> - which has a high global warming potential - as the interruption medium in gas circuit breakers. This paper experimentally studies the arcing characteristics of C<sub>5</sub>F<sub>10</sub>O-CO<sub>2</sub> 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 C<sub>5</sub>F<sub>10</sub>O-CO<sub>2</sub> mixture arc is more volatile than SF<sub>6</sub> gas, and adding C<sub>5</sub>F<sub>10</sub>O into CO<sub>2</sub> improves the stability of the arc, and significantly reduces the arc temperature.

ANALYSIS OF PNEUMATIC FINE PARTICLE PEENING PROCESS BY USING A HIGH-SPEED-CAMERA

2010 ◽  
Vol 24 (15n16) ◽  
pp. 3047-3052 ◽  
Author(s):  
TATSUYA ITO ◽  
SHOICHI KIKUCHI ◽  
YO HIROTA ◽  
ATSUSHI SASAGO ◽  
JUN KOMOTORI
Keyword(s):  
Particle Velocity ◽  
Fine Particle ◽  
High Speed ◽  
Hardened Layer ◽  
High Speed Camera ◽  
Hardness Tester ◽  
Commercial Grade ◽  
Air Resistance ◽  
Impact Angles ◽  
Scanning Electron

In this study, the peening behavior of shot particles in a fine particle peening (FPP) process such as velocity and impact angles were analyzed by using a high-speed-camera. Results showed that the velocity of shot particles depended on a peening pressure; the higher the peening pressure, the higher the particle velocity. The particle velocity measured in this study was approximately 120 m/s; this was much higher than that of the conventional shot peening (SP) process. This was because the air resistance of shot particles in the FPP process was higher than that of shot particles in the SP process. In order to discuss the surface modification effect of the FPP process, commercial-grade pure iron treated by the FPP process was characterized by micro-Vickers hardness tester and scanning electron microscope (SEM). Thickness of hardened layer treated with higher peening pressure was much higher than that of the lower pressure treated one. The unique microstructure with stratification patterns, which was harder than that of the other part, was observed near the specimen surface. The reason for the microstructural changes by the FPP treatment was discussed based on the kinetic energy of shot particles.

Comparison of Physical Experiments and Computer Simulation With ANCF: Large Deformation of a Thin Cantilever Beam

2003 ◽  
Author(s):  
Wan-Suk Yoo ◽  
Jeong-Han Lee ◽  
Jeong-Hyun Sohn ◽  
Su-Jin Park ◽  
Oleg Dmitrochenko ◽  
...  
Keyword(s):  
Cantilever Beam ◽  
High Speed ◽  
Large Deformations ◽  
Absolute Nodal Coordinate Formulation ◽  
Data Acquisition System ◽  
High Speed Camera ◽  
Large Deflections ◽  
Absolute Nodal Coordinate ◽  
Elastic Bodies ◽  
Physical Experiments

Many papers have studied computer-aided simulations of elastic bodies undergoing large deflections and large deformations. But there have not been many attempts to check the validity of the numerical formulations used in these studies. The main aim of this paper is to demonstrate the validity of one of such numerical formulations, the absolute nodal coordinate formulation (ANCF), by comparing the results it generates with the results of real experiments. Large oscillations of a thin cantilever beam are studied in this paper to numerically model the beam that also accounts for the effects of an attached endpoint weight and damping forces. The experiments were carried out using a high-speed camera and a data acquisition system.

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