کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
613656 880725 2006 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of interfacial mobility on rupture of thin stagnant films on a solid surface due to random mechanical perturbations
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Effect of interfacial mobility on rupture of thin stagnant films on a solid surface due to random mechanical perturbations
چکیده انگلیسی

Previous analysis of Narsimhan [G. Narsimhan, J. Colloid Interface Sci. 287 (2005) 624–633] for the evaluation of rupture of a nondraining thin film on a solid support due to imposed random mechanical perturbations modeled as a Gaussian white noise has been extended for partially mobile gas–liquid interfaces. The average rupture time of film is evaluated by first passage time analysis (as the mean time for the amplitude of perturbation to become equal to film thickness). The interfacial mobility is accounted for through surface viscosity as well as Marangoni effect. The mean rupture time for partially mobile gas–liquid interface, as characterized by two dimensionless groups, dimensionless surface viscosity and Marangoni number, lies between the two extreme limits for fully mobile and immobile films. The critical wavenumber for minimum rupture time is shown to be insensitive to interfacial mobility. However, the critical dimensionless surface viscosity and critical Marangoni number at which the behavior of thin film deviates from that of fully mobile film and the behavior approaches that of fully immobile film are smaller for higher Hamaker constants, smaller film thickness and smaller surface potentials.

The average lifetime of a thin film with mobile interface on a solid surface subjected to random Gaussian pressure fluctuations has been evaluated by a first passage time analysis.Figure optionsDownload high-quality image (39 K)Download as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Colloid and Interface Science - Volume 298, Issue 1, 1 June 2006, Pages 491–496
نویسندگان
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