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- W2023194098 abstract "Abstract A molecular beam of argon having a known translational kinetic energy of 〈KE〉 i / k = 758 K ( k is the Boltzmann constant) and a Mach number of M i = 17 impinges at different angles of incidence θ i on a heated ceramic surface with a surface temperature T s = 330–570 K. The angular distributions of velocity and the number flux of molecules reflected from the ceramic are determined from the time-of-light signals measured by a quadrupole mass spectrometer. The detected time-of-flight spectra agree well with the Maxwell distribution in the absence of a hydrodynamic flow velocity. The translational kinetic energy of the reflected molecules 〈KE〉 r increases proportionally to T s , and this yields a linear relation of 〈KE〉 r = C 1 〈KE〉 i + C 2 (2 kT s ). At θ i = 60°, C 1 = 0.8 and C 2 = 0.2; that is, the reflected molecules obtain 20% of their energy from the own incident energy owing to the elastic scattering effect and 80% from the heated ceramic surface owing to the inelastic effect. C 2 increases as θ i decreases, which corresponds to the scattering pattern of the cosine law. The conservation relation on the surface given by C 1 + C 2 = 1.0 is also confirmed in the experiment. The energy accommodation coefficient α measured in the experiment lies nearly on the value of C 2 , which istheoretically true when the conservation relation holds. However, α decreases slightly with an increase in T s ." @default.
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- W2023194098 date "1989-04-01" @default.
- W2023194098 modified "2023-09-27" @default.
- W2023194098 title "A microscopic experiment on energy exchange of an incident argon stream with a heated ceramic surface using the molecular beam mass spectrometer technique" @default.
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- W2023194098 doi "https://doi.org/10.1016/0894-1777(89)90037-x" @default.
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