J054034 固体表面における吸着分子の適応係数への影響([J05403]マイクロ・ナノスケールの熱流体現象(3))

Abstract

The Couette flow of a rarefied argon (Ar) gas between two parallel walls is considered to investigate the characteristics of the reflected gas molecule at a platinum (Pt) wall surface which physically adsorbs water (H20) molecules. The analysis is based on the molecular dynamics (MD) method for the interaction of gas molecules with the water adsorbed wall surface together with the direct simulation Monte-Carlo (DSMC) method for the motion of gas molecule. The accommodation coefficients of energy, tangential, and normal momentums are obtained. The accommodation coefficients for the water adsorbed surface depend on the adsorption rate a The tangential momentum accommodation coefficient a first increases rapidly from the value of the clean surface up to about C:60.2-0.3 and then becomes small. The accommodation coefficients of energy and normal momentum for the water adsorbed surface decrease with increasing the adsorption rate 9, and the variation of the normal momentum accommodation coefficients an with 0 is larger than the variation of the energy accommodation coefficients aE.