مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

بررسی تجربی و عددی تولید قطرات ریز در یک میکروکانال معمولی و اصلاح‌شده با موانع بیضی‌شکل

نوع مقاله : پژوهشی اصیل

نویسندگان
1 گروه مهندسی مکانیک، دانشکده فنی و مهندسی، دانشگاه محقق اردبیلی، اردبیل، ایران
2 گروه مهندسی مکانیک، واحد اردبیل، دانشگاه آزاد اسلامی، اردبیل، ایران
چکیده
مطالعه رفتار سیال در مقیاس میکرو، با نام مایکروفلوئیدیک شناخته می‌شود که در بسیاری از زمینه‌های علمی مورد توجه قرار گرفته است. در تحقیق حاضر، تولید قطره در یک میکروکانال به‌صورت عددی و تجربی بررسی شده است. دو میکروکانال به روش لیتوگرافی نرم ساخته شدند و نتایج مربوط به تولید قطره در آنها مقایسه شد. با استفاده از دو سیال غیرقابل امتزاج آب (سیال پراکنده) و روغن (سیال پیوسته) و در نسبت‌های مختلف جریان، فرآیند تشکیل قطره بررسی شد. تصاویر حاصل از مراحل تشکیل و عبور قطرات در میکروکانال‌ها با استفاده از روش پردازش تصویر تحلیل شد. نتایج حاصل نشان دادند که با افزایش نسبت دبی سیال پراکنده به سیال پیوسته، ضمن افزایش سایز قطرات، فاصله تشکیل قطرات (فاصله بین قطرات تولیدشده) افزایش یافته و فرکانس تولید قطرات کاهش می‌یابد. همچنین هندسه جدید پیشنهادشده منجر به تولید قطراتی ریزتر با فرکانس تولید بیشتر می‌شود. با توجه به تغییرات در دبی جریان سیالات مورد بررسی، در هندسه پایه قطر قطرات بین ۱۱۷ تا ۷۰۰میکرومتر و در هندسه پیشنهادی بین ۴۶ تا ۴۶۶میکرومتر است. در هندسه پیشنهادشده علاوه بر کاهش در اندازه قطرات تولیدی فرکانس تولید نیز افزایش می‌یابد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

On the Experimental and Numerical Droplet Generation in the Ordinary and Modified Micro channels with Oval Obstacle

نویسندگان English

F.S. Moghanlou 1
E. Ghazanfari Jajin 1
M. Vajdy Hokmabad 1
Sh. Jafargholinejad 2
1 Department of Mechanical Engineering, Faculty of Engineering, Mohaghegh Ardabili University, Ardabil, Iran
2 Department of Mechanical Engineering, Ardabil Branch, Islamic Azad University, Ardabil, Iran
چکیده English

The study of micro-scale fluid behavior is known as microfluidics, which has received much attention in many scientific fields. In the current research, the droplet generation in the micro channel has been studied numerically and experimentally. Two micro channels were fabricated by soft lithography method and the results of generated droplets were compared. The process of droplet formation was investigated using two fluids including water (dispersed fluid phase), and oil (continuous fluid phase) at different flow ratios. The images of the droplet formation and crossing steps in the micro channels were analyzed using image processing. The results showed that by increasing the ratio of dispersed to continuous flow, the size of droplets was increased, the droplet formation distance (the distance of the produced droplets) was increased, and the frequency of droplets generation was decreased. Also, the proposed new geometry leads to the production of smaller droplets with higher production frequencies. In the basic geometry, the droplet diameter was observed to be between 117 and 700 micrometers while in the proposed geometry, the diameter of droplets is between 46 and 466 micrometers. In the proposed geometry, the size of the produced droplets decreases, and the production frequency increases.

کلیدواژه‌ها English

Micro channel
Droplet Generation
Image processing
Surface tension
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