A dynamic technique for measuring normal spectral emissivity of electrically conducting solids at high temperatures with a high-speed spatial scanning pyrometer

1993 ◽  
Vol 14 (5) ◽  
pp. 1109-1114 ◽  
Author(s):  
A. Cezairliyan ◽  
A. P. Miiller
Keyword(s):  
High Temperatures ◽  
High Speed ◽  
Spectral Emissivity ◽  
Normal Spectral Emissivity ◽  
Electrically Conducting ◽  
Dynamic Technique

MODELING THE NORMAL SPECTRAL EMISSIVITY OF BRASS H62 AT 800–1100 K DURING OXIDE LAYER GROWTH

2018 ◽  
Vol 49 (15) ◽  
pp. 1445-1458
Author(s):  
Deheng Shi ◽  
Fenghui Zou ◽  
Zunlue Zhu ◽  
Jinfeng Sun
Keyword(s):  
Oxide Layer ◽  
Spectral Emissivity ◽  
Layer Growth ◽  
Normal Spectral Emissivity

scholarly journals High-enthalpy hypersonic flows

2020 ◽  
Vol 2 (1) ◽  
Author(s):  
Joseph J. S. Shang ◽  
Hong Yan
Keyword(s):  
Hypersonic Flow ◽  
High Speed ◽  
Quantum Physics ◽  
Nonequilibrium Thermodynamic ◽  
Strong Shock ◽  
Hypersonic Flows ◽  
Electrically Conducting ◽  
High Enthalpy ◽  
Speed Range ◽  
Flow Theories

Abstract Nearly all illuminating classic hypersonic flow theories address aerodynamic phenomena as a perfect gas in the high-speed range and at the upper limit of continuum gas domain. The hypersonic flow is quantitatively defined by the Mach number independent principle, which is derived from the asymptotes of the Rankine-Hugoniot relationship. However, most hypersonic flows encounter strong shock-wave compressions resulting in a high enthalpy gas environment that always associates with nonequilibrium thermodynamic and quantum chemical-physics phenomena. Under this circumstance, the theoretic linkage between the microscopic particle dynamics and macroscopic thermodynamics properties of gas is lost. When the air mixture is ionized to become an electrically conducting medium, the governing physics now ventures into the regimes of quantum physics and electromagnetics. Therefore, the hypersonic flows are no longer a pure aerodynamics subject but a multidisciplinary science. In order to better understand the realistic hypersonic flows, all pertaining disciplines such as the nonequilibrium chemical kinetics, quantum physics, radiative heat transfer, and electromagnetics need to bring forth.

Study of the normal spectral emissivity of tungsten between 170 and 500 °C by a single-wavelength infrared thermometer

2021 ◽  
Vol 173 ◽  
pp. 112848
Author(s):  
Shuangbao Shu ◽  
Ziyi Wang ◽  
Huajun Liang ◽  
Yuzhong Zhang ◽  
Chengliang Pan ◽  
...  
Keyword(s):  
Spectral Emissivity ◽  
Normal Spectral Emissivity ◽  
Infrared Thermometer

Investigation of the effects of Ni-based alloy K465 on the normal spectral emissivity during oxidation

2016 ◽  
Vol 78 ◽  
pp. 214-222 ◽  
Author(s):  
Shunan Zhao ◽  
Xunfeng Li ◽  
Xiaoming Zhou ◽  
Keyong Cheng ◽  
Xiulan Huai
Keyword(s):  
Spectral Emissivity ◽  
Normal Spectral Emissivity

scholarly journals Normal spectral emissivity of liquid Al-Ti binary alloys

2020 ◽  
Vol 48 (5-6) ◽  
pp. 423-438
Author(s):  
JUERGEN BRILLO ◽  
JOHANNA J. WESSING ◽  
HIDEKAZU KOBATAKE ◽  
HIROYUKI FUKUYAMA
Keyword(s):  
Temperature Dependence ◽  
Reasonable Agreement ◽  
Spectral Emissivity ◽  
Liquid System ◽  
Normal Spectral Emissivity ◽  
Binary Liquid System ◽  
Binary Liquid ◽  
Electrical Resistivities ◽  
Existing Data ◽  
Good Agreement

The normal spectral emissivity ε of four compositions in the Al-Ti binary liquid system was measured in dependence of the wavelength and temperature. It was found that all compositions show negligible temperature dependence. At a wavelength of 940 nm, the emissivity amounts to 0.37, 0.40, 0.32, and 0.31 for Ti, Al20Ti80, Al50Ti50, and Al70Ti30, respectively. The dependence of the emissivity on composition is in good agreement with literature data of binary and multi-component Al-Ti-based alloys. Using the classical Drude model, electrical resistivities are predicted for the Al-Ti system from the measured emissivities. Comparison with existing data from literature for Al show reasonable agreement.

scholarly journals Composition Dependence of Normal Spectral Emissivity of Liquid Ni–Al Alloys

2020 ◽  
Author(s):  
Masayoshi Adachi ◽  
Yuji Yamagata ◽  
Manabu Watanabe ◽  
Sonoko Hamaya ◽  
Makoto Ohtsuka ◽  
...  
Keyword(s):  
Composition Dependence ◽  
Spectral Emissivity ◽  
Al Alloys ◽  
Normal Spectral Emissivity

scholarly journals Forging, textures, and deformation systems in a B2 FeAl alloy

1999 ◽  
Vol 14 (3) ◽  
pp. 715-728 ◽  
Author(s):  
P. Zhao ◽  
D. G. Morris ◽  
M. A. Morris Munoz
Keyword(s):  
High Temperature ◽  
Flow Stress ◽  
Slip System ◽  
High Temperatures ◽  
Low Temperatures ◽  
High Speed ◽  
Deformation Texture ◽  
Slip Systems ◽  
Feal Alloy ◽  
Very High

High-temperature forging experiments have been carried out by axial compression testing on a Fe–41Al–2Cr alloy in order to determine the deformation systems operating under such high-speed, high-temperature conditions, and to examine the textures produced by such deformation and during subsequent annealing to recrystallize. Deformation is deduced to take place by the operation of 〈111〉 {110} and 〈111〉{112} slip systems at low temperatures and by 〈100〉{001} and 〈100〉{011} slip systems at high temperatures, with the formation of the expected strong 〈111〉 textures. The examination of the weak 〈100〉 texture component is critical to distinguishing the operating slip system. Both texture and dislocation analyses are consistent with the operation of these deformation systems. Recrystallization takes place extremely quickly at high temperatures (above 800 °C), that is within seconds after deformation and also dynamically during deformation itself. Recrystallization changes the texture such that 〈100〉 textures superimpose on the deformation texture. The flow stress peak observed during forging is found at a very high temperature. Possible origins of the peak are examined in terms of the operating slip systems.

Nonlinear response of high-speed infrared electronic devices: calibration for high temperatures

2021 ◽  
Author(s):  
Marie Dabos ◽  
Isabelle Ranc-Darbord ◽  
Marc Genetier ◽  
Nicolas Lecysyn ◽  
Khanh-Hung Tran ◽  
...  
Keyword(s):  
High Temperatures ◽  
High Speed ◽  
Nonlinear Response ◽  
Electronic Devices
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