다양한 흡착 특성을 갖는 초박 액막의 응결 특성에 대한 연구
Study on the condensational properties of ultra-thin liquid film of various wetting properties
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Ultra-thin liquid films on solid substrates in contact with the saturated vapor are studied by usingmolecular dynamics simulation. The properties of evaporation and condensation of the films of variousadsorptive strengths and thicknesses are obtained during the quasi-steady film evolution. Net condensationsoccur when the ultra-thin films on the high energy surface come into contact with the saturated vapor phasebecause the normal film pressure stays lower than the saturated vapor pressure. The net condensation rate ishigher for the material combination of higher adsorptive strength. It becomes more so when the film thicknessis of a lesser size. On the other hand, that of lower adsorptive strength has lower net condensation rate anddepends less on the film thickness. Therefore, the size effect of the condensation phenomenon is moresignificant for the system of a higher adsorptive strength. This properties come from the state of ultra-thinfilm, which can be quantified by using disjoining pressure in the quasi-steady processes. These results haveimplications in practical problems concerning the moving contact line when the precursor film formation iscritical.
Abstract
Ultra-thin liquid films on solid substrates in contact with the saturated vapor are studied by usingmolecular dynamics simulation. The properties of evaporation and condensation of the films of variousadsorptive strengths and thicknesses are obtained during the quasi-steady film evolution. Net condensationsoccur when the ultra-thin films on the high energy surface come into contact with the saturated vapor phasebecause the normal film pressure stays lower than the saturated vapor pressure. The net condensation rate ishigher for the material combination of higher adsorptive strength. It becomes more so when the film thicknessis of a lesser size. On the other hand, that of lower adsorptive strength has lower net condensation rate anddepends less on the film thickness. Therefore, the size effect of the condensation phenomenon is moresignificant for the system of a higher adsorptive strength. This properties come from the state of ultra-thinfilm, which can be quantified by using disjoining pressure in the quasi-steady processes. These results haveimplications in practical problems concerning the moving contact line when the precursor film formation iscritical.
참고문헌 (10)
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