کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9693408 | 1459119 | 2005 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Numerical investigation of the rheology of a dilute emulsion of drops in an oscillating extensional flow
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
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چکیده انگلیسی
The rheology of a dilute emulsion of viscous drops in an oscillating extensional flow is investigated. Deforming drop shape is computed using a front tracking finite difference method. Excess stresses due to drops are determined using Bachelor's formula neglecting drop-drop interactions. We present and discuss the relations between the excess stress and the applied strain rate. We explore the linear extensional rheology by computing extensional storage and loss moduli. The effects of frequency and surface tension variations are discussed and compared with analytical models of Oldroyd and Yu and Bousmina. We find that the nature of the excess interfacial stress depends on the relative magnitudes of the time period of oscillation and the relaxation time of the droplet. The excess stress is predominantly elastic (viscous) if the period is much smaller (larger) than the relaxation time. These phenomena are explained using the detail drop dynamics.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Newtonian Fluid Mechanics - Volume 128, Issues 2â3, 20 July 2005, Pages 71-82
Journal: Journal of Non-Newtonian Fluid Mechanics - Volume 128, Issues 2â3, 20 July 2005, Pages 71-82
نویسندگان
Xiaoyi Li, Kausik Sarkar,