کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
651277 1457409 2015 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Flow characteristics in a micro-cavity swept by a visco-elastic fluid
ترجمه فارسی عنوان
ویژگی های جریان در یک حفره ی کوچک که توسط یک مایع ویسکوزیته الاستیک جابجا می شود
کلمات کلیدی
میکرو حفره، مایع ویسکوزیته الاستیک، بی ثباتی الاستیک
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی


• We investigated flow characteristics of some visco-elastic fluids in a micro-cavity.
• We found a tonguing motion occurs when the Weissenberg number is higher than 200.
• We found a bulge structure is formed when the elasticity is high.

Flow characteristics of visco-elastic fluids sweeping a one-side micro-cavity mounted in a micro-duct have been investigated in order to develop a novel technique of a mixing process for micro-reactors. In this paper, effects of the Reynolds number and of the rheological characteristics of the fluids were focused on. The cavity depth, the cavity length and the width of the wider flow path were fixed at 200, 1,000 and 400 μm, respectively. As a visco-elastic fluid, a solution of cationic surfactants with counter-ions was used. The molar ratio of counter-ions to surfactants was changed in four steps in order to change the rheological characteristics of the visco-elastic fluids. The Reynolds number was also changed from 0.100 to 100. From the results, it was found that a tonguing motion of the separation fluid bubble tip formed in the downstream region in the cavity occurs at a certain Weissenberg number larger than 200 due to the elastic instability. The fluctuating bulge structure was also observed on the upstream side wall of the cavity in a higher range of the Weissenberg number. Such a elastic instability can be expected a suitable micro-fluid motion for the micro-mixing.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Experimental Thermal and Fluid Science - Volume 67, October 2015, Pages 96–101
نویسندگان
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