A measurement technique for hemispherical total emissivity using feedback-controlled pulse current heating

2000 ◽  
Vol 32 (1) ◽  
pp. 67-72 ◽  
Author(s):  
Tsuyoshi Matsumoto ◽  
Akira Ono
Keyword(s):  
Measurement Technique ◽  
Pulse Current ◽  
Hemispherical Total Emissivity ◽  
Total Emissivity

scholarly journals Hemispherical total emissivity and specific heat capacity of deeply undercooled Zr41.2Ti13.8Cu12.5Ni10.0Be22.5 melts

1995 ◽  
Vol 66 (23) ◽  
pp. 3111-3113 ◽  
Author(s):  
R. Busch ◽  
Y. J. Kim ◽  
W. L. Johnson ◽  
A. J. Rulison ◽  
W. K. Rhim ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Specific Heat ◽  
Specific Heat Capacity ◽  
Hemispherical Total Emissivity ◽  
Total Emissivity

A survey of hemispherical total emissivity of the refractory metals in practical use

Energy ◽  
2005 ◽  
Vol 30 (2-4) ◽  
pp. 535-543 ◽  
Author(s):  
Akihiko Otsuka ◽  
Kazuo Hosono ◽  
Ryohei Tanaka ◽  
Kuniyuki Kitagawa ◽  
Norio Arai
Keyword(s):  
Refractory Metals ◽  
Hemispherical Total Emissivity ◽  
Total Emissivity

Thermophysical properties of zirconium at high temperature

1999 ◽  
Vol 14 (9) ◽  
pp. 3713-3719 ◽  
Author(s):  
Paul-François Paradis ◽  
Won-Kyu Rhim
Keyword(s):  
Surface Tension ◽  
Heat Capacity ◽  
Thermal Expansion ◽  
High Temperature ◽  
Expansion Coefficient ◽  
Volume Expansion ◽  
Constant Pressure ◽  
Hemispherical Total Emissivity ◽  
Volume Expansion Coefficient ◽  
Total Emissivity

Six thermophysical properties of both solid and liquid zirconium measured using the high-temperature electrostatic levitator at the Jet Propulsion Laboratory are presented. These properties are density, thermal expansion coefficient, constant pressure heat capacity, hemispherical total emissivity, surface tension, and viscosity. For the first time, we report the densities and the thermal expansion coefficients of both the solid as well as liquid Zr over wide ranges of temperatures. Over the 1700–2300 K temperature span, the liquid density can be expressed as ρ1(T) = 6.24 × 103 – 0.29(T – Tm) kg/m3 with Tm = 2128 K, and the corresponding volume expansion coefficient as α1 = 4.6 × 10−5/K. Similarly, over the 1250–2100 K range, the measured density of the solid can be expressed as ρs(T) = 6.34 × 103 – 0.15(T – Tm), giving a volume expansion coefficient αs = 2.35 × 10−5/K. The constant pressure heat capacity of the liquid phase could be estimated as Cpl(T) = 39.72 – 7.42 × 10−3(T – Tm) J/(mol/K) if the hemispherical total emissivity of the liquid phase εT1 remains constant at 0.3 over the 1825–2200 K range. Over the 1400–2100 K temperature span, the hemispherical total emissivity of the solid phase could be rendered as εTs(T) = 0.29 – 9.91 × 103 (T – Tm). The measured surface tension and the viscosity of the molten zirconium over the 1850–2200 K range can be expressed as ς(T) = 1.459 × 103 – 0.244 (T – Tm) mN/m and as η(T) = 4.83 – 5.31 × 10−3(T – Tm) mPa s, respectively.

Hemispherical Total Emissivity of Potential Structural Materials for Very High Temperature Reactor Systems: Haynes 230

2012 ◽  
Vol 179 (3) ◽  
pp. 429-438 ◽  
Author(s):  
Raymond K. Maynard ◽  
Naphtali M. Mokgalapa ◽  
Tushar K. Ghosh ◽  
Robert V. Tompson ◽  
Dabir S. Viswanath ◽  
...  
Keyword(s):  
High Temperature ◽  
Structural Materials ◽  
Hemispherical Total Emissivity ◽  
Haynes 230 ◽  
Very High Temperature Reactor ◽  
High Temperature Reactor ◽  
Very High ◽  
Total Emissivity

Hemispherical total emissivity of Hastelloy N with different surface conditions

2012 ◽  
Vol 426 (1-3) ◽  
pp. 85-95 ◽  
Author(s):  
Andrew J. Gordon ◽  
Kyle L. Walton ◽  
Tushar K. Ghosh ◽  
Sudarshan K. Loyalka ◽  
Dabir S. Viswanath ◽  
...  
Keyword(s):  
Hemispherical Total Emissivity ◽  
Surface Conditions ◽  
Total Emissivity
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