scholarly journals Experimental Investigation of Laser Transmission Welding of Thermoplastics with Part-Adapted Temperature Fields

2013 ◽  
Vol 41 ◽  
pp. 59-69 ◽  
Author(s):  
M. Devrient ◽  
M. Kern ◽  
P. Jaeschke ◽  
U. Stute ◽  
H. Haferkamp ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Temperature Fields ◽  
Laser Transmission Welding

Laser transmission welding with part adapted temperature fields

2012 ◽  
Author(s):  
Martin Devrient ◽  
Verena Wippo ◽  
Peter Jaeschke ◽  
Uwe Stute ◽  
Thomas Frick ◽  
...  
Keyword(s):  
Temperature Fields ◽  
Laser Transmission Welding

scholarly journals Experimental investigation of temperature fields in a synthetic jet

2014 ◽  
Vol 18 ◽  
pp. 03001 ◽  
Author(s):  
Petra Dančová ◽  
Roman Doleček ◽  
Vít Lédl
Keyword(s):  
Experimental Investigation ◽  
Synthetic Jet ◽  
Temperature Fields

Low Solar Absorption Coating for Reducing Rail Temperature

2014 ◽  
Author(s):  
Hao Wang ◽  
Jiaqi Chen ◽  
P. N. Balaguru ◽  
Leith Al-Nazer
Keyword(s):  
Heat Transfer ◽  
Experimental Investigation ◽  
Field Measurements ◽  
Temperature Fields ◽  
Track Structure ◽  
Coating Materials ◽  
Solar Absorption ◽  
Average Temperature ◽  
Train Speed ◽  
Different Levels

The feasibility of using low-solar-absorption coatings to reduce the temperature rise of rails in summer is investigated in this paper using numerical analysis. Finite element (FE) models were developed based on the theory of heat transfer for predicting temperature fields in the rail track structure. Field measurements of air temperature and rail temperature were used to verify the modeled temperatures. Analysis results show that the developed FE models provide reasonable predictions of rail temperature. The 3-D rail temperature field shows that rail temperature differs spatially in the natural environment, which indicates that the current average temperature models may not provide accurate prediction of peak rail temperature. The peak temperature was observed at the top of rail seated on the wood ties. The developed FE models were further used to analyze the influence of solar absorptivity and emissivity of coating materials on rail temperature. Decreasing the absorptivity and increasing the emissivity of rail surface may decrease the peak rail temperature at different levels. The effect of decreased absorptivity was found to be more significant. This indicates that when an engineered coating material is applied on rail side surfaces, the peak rail temperature can be decreased significantly, which provides an alternative solution to reduce rail buckling risk without decreasing train speed or increasing the laydown temperature of rail. The experimental investigation of the effect of low solar absorption coating on rail temperature is ongoing.

Laser Transmission Welding of Thermoplastic: Experimental Investigation Using Polycarbonate

2015 ◽  
Vol 1091 ◽  
pp. 63-69 ◽  
Author(s):  
Sekou Singare ◽  
Sheng Gui Chen ◽  
Jian Jun Zou ◽  
Nan Li
Keyword(s):  
Experimental Investigation ◽  
Melting Point ◽  
Laser Welding ◽  
Laser Weld ◽  
Main Principle ◽  
Laser Transmission Welding

The use of lasers for joining plastics is growing. Several different approaches are being developed for laser welding of plastics. The main principle now used to laser-weld plastics is known as “transmission welding.” Transmission welding has demonstrated that precise, controllable heating and melting of low melting point thermoplastics can be produced at the interface between a transmissive and an absorptive plastic. [1-8]

scholarly journals Digital Holographic Interferometry for the Measurement of Symmetrical Temperature Fields in Liquids

Photonics ◽  
2021 ◽  
Vol 8 (6) ◽  
pp. 200
Author(s):  
Gramoz Cubreli ◽  
Pavel Psota ◽  
Petra Dančová ◽  
Vít Lédl ◽  
Tomáš Vít
Keyword(s):  
Experimental Investigation ◽  
Temperature Field ◽  
Holographic Interferometry ◽  
Temperature Fields ◽  
Water Tank ◽  
Back Projection ◽  
Field Change ◽  
Abel Transform ◽  
Higher Temperature ◽  
Heated Fluid

In this paper, we present a method of quantitatively measuring in real-time the dynamic temperature field change and visualization of volumetric temperature fields generated by a 2D axial-symmetric heated fluid from a pulsatile jet in a water tank through off-axis digital holographic interferometry. A Mach-Zehnder interferometer on portable platform was built for the experimental investigation. The pulsatile jet was submerged in a water tank and fed with water with higher temperature. Tomographic approach was used to reconstruct the temperature fields through the Abel Transform and the filtered back-projection. Averaged results, tomographic view, standard deviation and errors are presented. The presented results reveal digital holographic interferometry as a powerful technique to visualize temperature fields in flowing liquids and gases.

Sign in / Sign up

Export Citation Format

Share Document