کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
592316 1453900 2015 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A population balance treatment of bubble size evolution in free draining foams
ترجمه فارسی عنوان
درمان تعادل جمعیت از تکامل اندازه حباب در فوم تخلیه آزاد است
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
چکیده انگلیسی


• Experimental bubble size distribution evolution in a draining foam.
• The distributions follow a log-normal shape with evolving parameters.
• Inverse population balance problem for coalescence and/or ripening rates.

Modeling foam drainage is an important step in understanding foam stability properties. There is a two way coupling between foam drainage dynamics and bubble size evolution. The bubble size evolution is determined in the general case by two processes: ripening and coalescence. The ripening problem modeling is relatively easy and it has been extensively studied. The coalescence problem is very complex and its modeling attempts are limited. The most sophisticated studies are based on the statistics of bubble films leading to the evolution of the average bubble size. Here an alternative approach to indirect modeling of the coalescence process is attempted. Experimental results of the evolution of bubble size distribution in free draining foams are registered. Then the so called inverse population balance approach is invoked to estimate the coalescence and ripening rates leading to the experimental bubble size evolution. Several surfactant concentrations are employed to yield foams of varying stability. It is shown that the experimental bubble size distributions can be adequately described in all cases by a log-normal distribution. This simplifies vastly the inverse problem solution since approximate methods can now be used for the solution of the population balance equation.

Evolving size distributions of bubbles in a foam undergoing simultaneous drainage, coalescence and ripening.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 473, 20 May 2015, Pages 75–84
نویسندگان
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