scholarly journals Influence of asymmetric airflow on the cooling performance of brake disc of railway vehicle

2021 ◽  
Vol 1199 (1) ◽  
pp. 012034
Author(s):  
V Pavelcik ◽  
Y Fomina
Keyword(s):  
Test Bench ◽  
Cfd Simulation ◽  
Railway Vehicle ◽  
Brake Disc ◽  
Inlet Pipe ◽  
Cooling Performance ◽  
Temperature Changes ◽  
Additional Information ◽  
Air Inlet ◽  
Cooling Effects

Abstract The main objective of this article is to discuss the influence of asymmetric airflow on the cooling performance of the brake disc. This asymmetry might be caused by the air inlet pipe curvature of the UIC test bench for frictional components, whereas in reality this asymmetry might be caused by various factors. In the first part of the paper, a brief summary of effects of heat and temperature changes on the brake disc is presented. Additional information about UIC test bench is given with the focus on cooling effects of airflow on the disc. In the second part, a CFD simulation was made, and its settings and results are presented in detail. In the last part, temperature differences in various time points and positions on the brake disc are compared graphically in order to assess the influence of airflow from the inlet pipe and its curvature on the cooling performance of the brake disc.

Fatigue life assessment for brake disc of railway vehicle

2009 ◽  
Vol 33 (1) ◽  
pp. 37-42 ◽  
Author(s):  
D.-J. KIM ◽  
C.-S. SEOK ◽  
J.-M. KOO ◽  
W.-T. WE ◽  
B.-C. GOO ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Life Assessment ◽  
Railway Vehicle ◽  
Brake Disc ◽  
Fatigue Life Assessment

Design of a test bench for gas leaks using CFD simulation and IR-thermography detection

2019 ◽  
pp. 1-14 ◽  
Author(s):  
Xiaolong Fu ◽  
Jizhen Li ◽  
Guofang Zhang ◽  
Chongmin Zhang ◽  
Xuezhong Fan
Keyword(s):  
Test Bench ◽  
Cfd Simulation ◽  
Ir Thermography ◽  
Gas Leaks

Experimental Study of Convective Heat Transfer in Standard and Cross-Drilled Brake Discs With Radial Vane and X-Lattice Cores

2018 ◽  
Author(s):  
Hongbin Yan ◽  
Shangsheng Feng ◽  
Wei-Tao Wu ◽  
Tian Jian Lu ◽  
Gongnan Xie
Keyword(s):  
Heat Transfer ◽  
Experimental Comparison ◽  
Brake Disc ◽  
Disc Brake ◽  
Cooling Performance ◽  
Flow And Heat Transfer ◽  
Brake Discs ◽  
Flow Through ◽  
The Cross ◽  
Transfer Mechanisms

To improve the cooling performance of disc brake systems, cross-drilled holes penetrating across the rubbing discs are separately introduced into a commercial radial vane brake disc (as reference) and a novel X-lattice cored brake disc. Prototype samples of both the reference and cross-drilled brake discs are fabricated. A rotating test rig is designed and constructed to characterize and compare the cooling performance of the brake discs with infrared thermography. Within the typical operating range of a vehicle, e.g., 200–1000 rpm, the experimental results show that the introduction of cross-drilled holes can substantially enhance brake disc cooling. For the radial vane brake disc, the overall Nusselt number is enhanced by 31%–44%; for the X-lattice cored brake disc, the cross-drilled holes only lead to 9%–18% enhancement. As the radial vane brake disc and the X-lattice cored brake disc with cross-drilled holes exhibit similar cooling performance, flow through the cross-drilled holes has a more prominent effect on the former than the latter. Corresponding fluid flow and heat transfer mechanisms underlying the enhanced heat transfer by cross-drilled holes and the different effects of cross-drilled holes on the two distinct brake discs are explored. The experimental comparison and the thermo-fluidic physics presented in this paper are beneficial for engineers to further improve disc brake cooling.

scholarly journals Refinement of Temperature Sensing Yarns

Proceedings ◽  
2017 ◽  
Vol 2 (3) ◽  
pp. 123 ◽  
Author(s):  
Pasindu Lugoda ◽  
Tilak Dias ◽  
Theodore Hughes-Riley ◽  
Rob Morris
Keyword(s):  
Thermal Properties ◽  
Steady State ◽  
Body Temperature ◽  
Temperature Monitoring ◽  
Temperature Sensing ◽  
Temperature Measurements ◽  
Wound Infections ◽  
Temperature Changes ◽  
Additional Information ◽  
Polymer Resin

Body temperature is an important parameter to measure in a number of fields such as medicine and sport. In medicine temperature changes can indicate underlying pathologies such as wound infections, while in sport temperature can be associated to a change in performance. In both cases a wearable temperature monitoring solution is preferable. In earlier work a temperature sensing yarn has been developed and characterized. The yarns were constructed by embedding an off-the-shelf thermistor into a polymer resin micro-pod and then into the fibers of a yarn. This process created a temperature sensing yarn that was conformal, drapeable, mechanically resilient, and washable. This work builds on this early study with the purposes of identifying the steady state error bought about on the temperature measurements as a result of the polymer resin and yarn fibers. Here a wider range of temperatures than previously explored were investigated. Additionally two types of polymer resin with different thermal properties have been tested, with varying thicknesses, for the encapsulation of the thermistor. This provides useful additional information for optimizing the temperature sensing yarn design.

scholarly journals An experimental study on cooling performance of a car radiator using Al2O3 - ethylene glycol/water nanofluid

2020 ◽  
pp. 179-179
Author(s):  
Serdar Mert ◽  
Halit Yaşar ◽  
Ufuk Durmaz ◽  
Adnan Topuz ◽  
Alper Yeter ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Cooling Power ◽  
Inlet Temperature ◽  
Al2o3 Nanoparticles ◽  
Water Mixture ◽  
Cooling Performance ◽  
Air Inlet ◽  
Vehicle Engine ◽  
Original Case ◽  
Engine Coolant

Nanofluids have high thermal conductivity and can be used as vehicle engine coolant. In this article, the effects of Al2O3 nanoparticles to an engine coolant were experimentally investigated and the results were compared with the results of the original coolant including 50% ethylene glycol and 50% water mixture. The nanofluid was prepared by adding 0.5% Al2O3 nanoparticles by volume. The inlet temperature of the coolant was held constant at 95 Celsius. The tests were carried out at the air inlet temperatures between 23.4-28.6 ?C, the air velocity between 1.7-4.3 m/s, the cooling power between 2.5-15 kW and the cooling fluid flow rates between 10-25 L/min. The results show that nanoparticles increase the cooling performance of the engine radiator. By using Al2O3 nanoparticles, cooling power of the radiator has increased up to 17.46% compared to original case.

scholarly journals Development of a fixed bed solar dryer: experimental study and CFD simulation

2020 ◽  
Vol 9 (3) ◽  
pp. e123932667
Author(s):  
Ana Carolina Ribeiro Stoppe ◽  
José Luiz Vieira Neto ◽  
Kassia Graciele dos Santos
Keyword(s):  
Cfd Simulation ◽  
Fixed Bed ◽  
Drying Rate ◽  
Air Flow Rate ◽  
Air Velocity ◽  
Air Inlet ◽  
Solar Dryer ◽  
Computational Fluid Dynamics Cfd ◽  
The One ◽  
Moringa Oleifera Lam

Facing the challenges to develop more efficient solar dryers, this work used the Computational fluid dynamics (CFD) to test different configurations of lateral air feeding in a fixed bed solar dryer. Through the simulations, it was found the best configuration of air inlet that provided a better fluid-particle contact. It was made a fixed bed solar dryer, which was tested using soybeans seeds and Moringa oleifera LAM leaves to evaluate the drying rate using two bed configurations: fully opened and partially opened inlets. The CFD results indicated that the air flow rate was more pronounced at the bed top, near the exhaust fan. This can explain the poor drying near the bottom for the experiments performed with all lateral inlets opened. According to the simulation results, the air velocity profile was more homogeneous when the air was fed only near the bottom. So, the use of a partially opened configuration led to a more homogenous solar drying, with a drying rate about 300% higher than the one using the fully opened inlets.

Tire Splash and Spray Directly before and during Hydroplaning

2019 ◽  
Vol 47 (2) ◽  
pp. 141-159 ◽  
Author(s):  
Bernhard Schmiedel ◽  
Frank Gauterin
Keyword(s):  
Image Processing ◽  
Film Thickness ◽  
High Speed ◽  
Test Bench ◽  
Water Film ◽  
Water Film Thickness ◽  
Additional Information ◽  
Almost All ◽  
Main Effects ◽  
Require Information

ABSTRACT Wet roads can have a serious impact on tire traction. There are several ways of detecting wet roads; however, almost all of them come with disadvantages. Using the splash and spray behavior of the tire can offer a solution. To identify key parameters that influence splash and spray, we used high-speed cameras to record tires rolling on an internal drum tire test bench. The key parameters were water film thickness, speed, and profile geometry (tread pattern and tread depth). Our image-processing analysis showed three main effects in the splash and spray behavior that help to characterize the water film thickness: side splash, circumferential spray, and torrent spray. Circumferential spray and torrent spray can be used to estimate low and medium water film thicknesses, but these require information about speed and profile geometry. Side splash announces hydroplaning without the need for additional information.

Experimental Study on Cooling Performance of Air Conditioning

2015 ◽  
Vol 1092-1093 ◽  
pp. 512-515
Author(s):  
Kai Liang ◽  
Si Yuan Lu ◽  
Qing Hui Zhou
Keyword(s):  
Experimental Study ◽  
Air Conditioning ◽  
Actual Situation ◽  
Important Indicator ◽  
Cooling Performance ◽  
Temperature Changes ◽  
Passenger Comfort ◽  
Cooling Speed

Cooling performance of air conditioning is an important indicator in evaluating vehicle comfort. In this paper, taking three vehicles as examples, it evaluates the differences in cooling performance of air conditioning and passenger comfort by measuring the temperature of central vent and head room of driving position, researching the actual situation of temperature changes and analyzing the influence of cooling speed, strength and cabin shape to temperature.

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