Determination of Condensation Parameter of Vapours by Using a Shock-Tube
The condensation parameter (c.p.) and the condensation coefficient (c.c., sticking probability) of vapours consisting of polyatomic molecules are determined by using a shock-tube. The c.p. and the c.c. for three kinds of vapour are deduced from the comparison between experiment and gasdynamical theory with molecular gasdynamical boundary conditions. It is found that the experimental values of c.p. and c.c. of these vapours are significantly less than those for the complete capture of molecules on their condensed surfaces. The transition state theory suggests that these small values are due to that the rotational degrees of freedom of molecules in the liquid state are hindered in comparison with those of molecules in the gas state.
KeywordsShock Wave Liquid Film Transition State Theory Reflected Shock Wave Vapour Molecule
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- Fujikawa,S. and Maerefat,M.: A Study of Molecular Mechanism of Vapour Condensation. Trans.JSME(1989), (in press).Google Scholar
- Maerefat,M.; Fujikawa,S.; Akamatsu,T.; Goto,T. and Mizutani,T.: An Experimental Study of Non-equilibrium Vapour Condensation in a Shock-tube. Exp.in Fluids(1989), (in press).Google Scholar
- Hatamiya,S. and Tanaka,H.: A Study on the Mechanism of Dropwise Condensation.–2nd Report. Condensation Coefficient of Water at Low Pressures–Trans.JSME 52 (1986) 2214–2221.Google Scholar