分子線によるセラミックス表面のエネルギ交換に関する研究

概要

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The process of translational energy exchange on a ceramic is experimentally studied by the method of argon molecular beam. The incident molecules of a translational energy <KE.>_i/k=758 K and of a Mach number 17 impinge on a ceramic surface of temperatures T_s=300〜600 K. The angular distributions of velocity and number flux of molecules scattering from the ceramics are measured by a quadrupole mass spectrometer. The detected time-of-flight spectra agree well with the Maxwall distribution without macroscopic flow velocity. The translational energy of reflected molecules <KE>_γ increases proportionally to T_s and may be expressed by the formula <KE>_γ=C_1<KE>_i + C_2(2kT_S). C_1 ≃ 0.8 and C_<2> ≃0.2 at the incident angle θ_i=60°; namely, reflected molecures get their 20% energy from the elastic scattering effect of the incident beat and 80% from the inelastic one on the surface. Their energy accommodation coefficients α lie roughly on 0.8 which agrees with C_2, but α slightly decreases with an increase of T_5.
一般社団法人日本機械学会の論文
1985-01-25