تولید میکرو قطرات در یک میکروکانال با استفاده از کنترل‌کننده تناسبی-انتگرال‌گیر-مشتق‌گیر: بررسی آزمایشگاهی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 کارشناسی ارشد، دانشکده مکانیک، دانشگاه صنعتی شاهرود،

2 صنعتی شاهرود

3 Shahrood University of Tech, Shahrood, Iran

4 صنعتی شاهرود-مهندسی مکانیک

5 دانشگاه صنعتی شاهرود

چکیده

در زمینه تولید قطره، تنها تعداد معدودی از آن‌ها به کنترل حلقه‌بسته اندازه میکروقطره به صورت آنلاین پرداخته‌اند. در مطالعه پیش‌رو، ابتدا یک میکروکانال جریان متمرکزشونده به روش فوتولیتوگرافی ساخته شد. سپس آب دو بار تقطیر با دبی ثابت به عنوان سیال فاز گسسته و روغن به عنوان سیال فاز پیوسته به وسیله دو پمپ سرنگی مجزا درون میکروکانال تزریق شدند و بدین ترتیب تولید قطرات آب در روغن صورت پذیرفت. سپس با استفاده از یک میکروسکوپ دیجیتالی سرعت بالا به همراه یک الگوریتم پردازش تصویر، قطر قطرات تولیدشده اندازه‌‏گیری شد. پس از ایجاد ارتباط بین میکروسکوپ، پمپ‌های سرنگی و کامپیوتر، طراحی یک فلودیگرام کنترلی صورت پذیرفت. همچنین به منظور کنترل قطر قطرات، دبی فاز پیوسته به عنوان پارامتر کنترلی انتخاب و با استفاده از کنترل‏کننده تناسبی-انتگرال‌گیر-مشتق‌گیر کنترل شد. در این مطالعه قطر قطرات تولیدشده در یک میکروکانال به صورت لحظه‏ای اندازه‌گیری و بازخورد آن دریافت شده‌است. نتایج عملی برای سه قطر مطلوب 100، 140 و 160 میکرومتر نشان داد که در هر سه حالت سیستم کنترلی توانست قطر قطره‏‌های در حال تولید را در مقدار مطلوب تنظیم کند. همچنین با تغییر پله‌‏ای دبی فاز گسسته، از عملکرد مطلوب کنترل‏کننده در زمان اغتشاش اطمینان حاصل شد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Control of droplet size in a two-phase microchannel using PID controller: A novel experimental study

نویسندگان [English]

  • Sina Mottaghi 1
  • Mostafa Nazari 2
  • Mohsen Nazari 3
  • Naserodin Sepehry 4
  • Amir Mahdavi 5
1 MSc of mechanical engineering, Shahrood university of technology
2 Department of Mechanical Engineering, Shahrood University of Technology, Shahrood, Iran.
3 Shahrood University of Tech, Shahrood, Iran
4 صنعتی شاهرود-مهندسی مکانیک
5 Shahrood University of Technology
چکیده [English]

Precise droplet generation with controllable precise size is the target of this research. For this purpose, a flow focusing micro-channel is constructed using photolithography. Two syringe pumps are used, one for injecting discrete phase flow (DI water) and another for injecting continuous phase flow (oil). The Meros high speed camera is used for recording the image of droplets, and a fast image processing algorithm is used to calculate the size of the droplets. To regulate the size of the droplet, the PID controller is used due to its ease of implementation and robustness. The flow rate of the continuous phase flow is the control input and the size of the droplets is the output of the closed-loop system. Experimental tests are done by considering three desired droplet diameters, i.e. 100, 140 and 160 . To show the disturbance rejection characteristic of the designed closed-loop system, the flow rate of the discrete phase flow is changed stepwise. Due to this disturbance, the transient response of the system changed, but the controller attenuates this disturbance and regulates the system to the desired size. The experimental tests show that the designed closed-loop microfluidic system can generate droplets with desired precise size.

کلیدواژه‌ها [English]

  • Microchannel
  • Active control
  • PID controller
  • Two-phase flow
  • Micro-droplet

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نشریه مهندسی مکانیک امیرکبیر
دوره 53، شماره 7
مهر 1400
صفحه 4279-4292

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