مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

اندازه گیری سرعت حباب تیلور به کمک پردازش تصویر

نوع مقاله : پژوهشی اصیل

نویسندگان
محمدحسین رمضانی
محمد مهدی نوروزی
رضا مداحیان
محمد رضا انصاری
دانشگاه تربیت مدرس، تهران، ایران
چکیده
هدف از این پژوهش، ایجاد انواع الگو جریان دوفازی و بدست آوردن نقشه الگو جریان برای دو فاز آب و هوا در یک لوله عمودی از جنس پلکسی گلس شفاف به قطر 50 میلی­متر و طول 390 سانتی­متر و محاسبه سرعت میانگین حباب تیلور است. سیستم آزمایشگاهی لازم جهت انجام این پژوهش در آزمایشگاه جریان­های چند­فازی دانشگاه تربیت مدرس توسط تیم تحقیقاتی جریان­های چند­فازی طراحی و ساخته شده است. سه الگوی جریان حبابی، اسلاگ و متلاطم برای 320 سرعت ظاهری مختلف آب و هوا ایجاد و بررسی شدند. برای ایجاد الگوی جریان حبابی در ورودی هوا از یک توزیع­کننده هفت طبقه با قابلیت تغییر در تعداد حباب­های تولید شده، استفاده شده است. تاثیر سرعت ظاهری هر فاز بر الگوی جریان مورد ارزیابی قرار گرفت و نقشه الگو جریان برای320 داده مختلف رسم شد. به کمک پردازش تصاویر بدست آمده از دوربین سرعت بالا، سرعت میانگین حباب تیلور برای حالت­های جریاتی مختلف به همراه عدم قطعیت در محاسبه سرعت محاسبه شد. همچنین به کمک نتایج بدست آمده برای 5 سرعت مختلف از فاز مایع نمودار تغییر سرعت متوسط حباب تیلور با افزایش سرعت فاز گازی رسم و با رابطه نیکلین مقایسه شد.
کلیدواژه‌ها
جریان دوفازی
لوله عمودی
روش تجربی
الگوی جریان
سرعت حباب تیلور

موضوعات

عنوان مقاله English

Taylor bubble velocity measurement by using image processing

نویسندگان English

mohamadhossein ramezani
Mohammad Mehdi Noroozi
Reza Madahian
Mohammad Reza Ansari
University student
چکیده English

The purpose of this study is to generate two-phase flow patterns and to obtain a flow pattern map for two phases as water and air in a vertical pipe which is made of transparent Plexiglas. The pipe specification is 50 mm diameter and 390 cm length. In this attempt the average velocity of the Taylor bubble will be calculate. In order to facilitate this research work, a two phase flow was designed, built and adjusted at Tarbiat Modares University Two-phase flow laboratory. Three flow patterns as bubbly, slug and churn flow are generated and examined for 320 runs of different superficial velocities of air and water. A seven-layer distributor with the ability to change the number of bubbles produced is used to create a bubbly flow pattern at the air inlet. The effect of the superficial velocities of each phase on the flow pattern was evaluated and a flow pattern map was presented for 320 different data. By processing the images obtained from the high-speed camera, the average Taylor bubble velocity was calculated for different flow conditions with uncertainty in calculating the velocity. Also, for 5 different velocities of the liquid phase, a diagram of the average velocity of Taylor velocity with increasing gas velocity was drawn and compared with the Nicklin correlation which can be found in the literature

کلیدواژه‌ها English

two-phase flow
vertical pipe
experimental method
Flow pattern
Taylor bubble velocity
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مهندسی مکانیک مدرس
دوره 21، شماره 11
شهریور 1400
صفحه 757-765