Emissivities of High Temperature Metallic Melts

Susa, Masahiro; Endo, Rie

doi:10.1007/978-3-540-85918-5_6

Cited by 4 publications

(3 citation statements)

References 41 publications

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“…The emissivity is the ratio of energy radiated by a particular material to the energy radiated by a blackbody at the same temperature [18]. The radiation intensity from a blackbody I B depends on wavelength λ and temperature T, whereas I S depends on λ and T and on the direction of the radiation.…”

Section: Measurement Proceduresmentioning

confidence: 99%

“…The radiation intensity from a blackbody I B depends on wavelength λ and temperature T, whereas I S depends on λ and T and on the direction of the radiation. The directional spectral emissivity is defined as follows [18]:…”

Section: Measurement Proceduresmentioning

confidence: 99%

“…where C 1 and C 2 are Planck's first and second constants, having values, respectively, 5.96 × 10 −17 W m 2 sr −1 and 1.44 × 10 −2 m K. Integration of equation ( 1) over all directions gives the hemispherical spectral emissivity [18]. A merit of ESL is that the levitated molten sample is spherical.…”

Section: Measurement Proceduresmentioning

confidence: 99%

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Spectral emissivity measurements of liquid refractory metals by spectrometers combined with an electrostatic levitator

Ishikawa

Ito

Okada

et al. 2012

Meas. Sci. Technol.

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A spectral emissivity measurement system combined with an electrostatic levitator was developed for high-temperature melts. The radiation intensity from a high-temperature sample was measured with a multichannel photospectrometer (MCPD) over the 700–1000 nm spectral range, while a Fourier transform infrared spectrometer (FTIR) measured the radiation over the 1.1–6 µm interval. These spectrometers were calibrated with a blackbody radiation furnace, and the spectral hemispherical emissivity was calculated. The system's capability was evaluated with molten zirconium samples. The spectral hemispherical emissivity of molten zirconium showed a negative wavelength dependence and an almost constant variation over the 1850–2210 K temperature range. The total hemispherical emissivity of zirconium calculated by integrating the spectral hemispherical emissivity was found to be around 0.32, which showed good agreement with the literature values. The constant pressure heat capacity of molten zirconium at melting temperature was calculated to be 40.9 J mol−1 K−1.

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Section: Measurement Proceduresmentioning

confidence: 99%

Section: Measurement Proceduresmentioning

confidence: 99%