Model calculations of the temperature distribution in the laser‐heated diamond cell

1989 ◽  
Vol 65 (12) ◽  
pp. 4688-4692 ◽  
Author(s):  
Sorin Bodea ◽  
Raymond Jeanloz
Keyword(s):  
Temperature Distribution ◽  
Model Calculations ◽  
Laser Heated

Measurement of thermal conductivity in laser-heated diamond anvil cell using radial temperature distribution

2020 ◽  
Vol 40 (3) ◽  
pp. 315-324 ◽  
Author(s):  
Kamil M. Bulatov ◽  
Alexander N. Semenov ◽  
Alexey A. Bykov ◽  
Alexander S. Machikhin ◽  
Konstantin D. Litasov ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Temperature Distribution ◽  
Diamond Anvil Cell ◽  
Radial Temperature ◽  
Radial Temperature Distribution ◽  
Diamond Anvil ◽  
Laser Heated

scholarly journals Centreline and cross-glacier air temperature variability on an Alpine glacier: assessing temperature distribution methods and their influence on melt model calculations

2017 ◽  
Vol 63 (242) ◽  
pp. 973-988 ◽  
Author(s):  
THOMAS E. SHAW ◽  
BEN W. BROCK ◽  
ÁLVARO AYALA ◽  
NICK RUTTER ◽  
FRANCESCA PELLICCIOTTI
Keyword(s):  
Temperature Distribution ◽  
Air Temperature ◽  
Temporal Distribution ◽  
Temperature Variability ◽  
Lapse Rate ◽  
Balance Model ◽  
Model Parameters ◽  
Ambient Conditions ◽  
Distribution Models ◽  
Model Calculations

ABSTRACTThe spatio-temporal distribution of air temperature over mountain glaciers can demonstrate complex patterns, yet it is often represented simplistically using linear vertical temperature gradients (VTGs) extrapolated from off-glacier locations. We analyse a network of centreline and lateral air temperature observations at Tsanteleina Glacier, Italy, during summer 2015. On average, VTGs are steep (<−0.0065 °C m−1), but they are shallow under warm ambient conditions when the correlation between air temperature and elevation becomes weaker. Published along-flowline temperature distribution methods explain centreline observations well, including warming on the lower glacier tongue, but cannot estimate lateral temperature variability. Application of temperature distribution methods improves simulation of melt rates (RMSE) in an energy-balance model by up to 36% compared to the environmental lapse rate extrapolated from an off-glacier station. However, results suggest that model parameters are not easily transferable to glaciers with a small fetch without recalibration. Such methods have potential to improve estimates of temperature across a glacier, but their parameter transferability should be further linked to the glacier and atmospheric characteristics. Furthermore, ‘cold spots’, which can be >2°C cooler than expected for their elevation, whose occurrence is not predicted by the temperature distribution models, are identified at one-quarter of the measurement sites.

Measurement of the temperature distribution on the surface of the laser heated specimen in a diamond anvil cell system by the tandem imaging acousto-optical filter

2019 ◽  
Vol 39 (1) ◽  
pp. 131-149 ◽  
Author(s):  
Pavel V. Zinin ◽  
Alexey A. Bykov ◽  
Alexander S. Machikhin ◽  
Ivan A. Troyan ◽  
Kamil M. Bulatov ◽  
...  
Keyword(s):  
Temperature Distribution ◽  
Diamond Anvil Cell ◽  
Optical Filter ◽  
Cell System ◽  
Diamond Anvil ◽  
Heated Specimen ◽  
Laser Heated

Numerical Modeling of CO2 Laser-Heated Moving Glass Rods

2002 ◽  
Author(s):  
Weixue Tian ◽  
Wilson K. S. Chiu
Keyword(s):  
Temperature Distribution ◽  
Absorption Coefficient ◽  
Laser Irradiation ◽  
Co2 Laser ◽  
Radiation Heat Transfer ◽  
Critical Diameter ◽  
High Absorption Coefficient ◽  
Glass Rods ◽  
Volume Method ◽  
Laser Heated

A numerical model is introduced to calculate the temperature field in moving glass rods heated by CO2 laser irradiation at a wavelength of 10.6 μm. The glass is assumed to be opaque to laser irradiation due to its high absorption coefficient at 10.6 μm. The dependence of the absorption coefficient on wavelength and temperature is considered in this model. The diffusion approximation is incorporated to analyze the radiation heat transfer in the glass rod. This approximation is valid when the glass rod is above a critical diameter. The temperature within the glass is solved using the finite volume method. The effect of laser power, laser focus, the moving speed and the radius of glass rod on the temperature distribution are studied. It is found that all these parameters have a significant effect on the temperature distribution in the glass rod. Results of simulation show that, with careful choice of these parameters, a CO2 laser may be used as a heat source for glass rod annealing or coating with stringent temperature constraints.

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