کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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612170 | 880692 | 2007 | 11 صفحه PDF | دانلود رایگان |
Coalescence times for air bubbles rising through hexadecane to an air–hexadecane interface are measured and compared with an analysis based upon our previous extension of continuum mechanics to the nanoscale [J.C. Slattery, E.-S. Oh, K. Fu, Chem. Eng. Sci. 59 (2004) 4621–4635] with the assumption of retarded dispersion forces. The relation between the retarded and non-retarded Hamaker constants proposed by Görner and Pich [J. Aerosol Sci. 20 (7) (1989) 735–747] is tested for the first time.
As a bubble approaches an interface during the last stage of coalescence, a thin liquid film is formed and deformed as the result of retarded dispersion forces. Its thickness h∗h∗ is a function of time t∗t∗ and radial position r∗r∗. The film ruptures and coalescence occurs, when h∗=0h∗=0.Figure optionsDownload as PowerPoint slide
Journal: Journal of Colloid and Interface Science - Volume 315, Issue 2, 15 November 2007, Pages 569–579