نویسندگان

دانشکده مهندسی مکانیک، دانشگاه صنعتی اصفهان، اصفهان

چکیده

جداسازی ذرات، کاربردهای زیادی هم در پزشکی و بیولوژی و هم در صنعت دارد. در این پژوهش جداسازی ذرات پلی‌استایرن با قطر 10، 20 و 30 میکرومتر در جریان سیال در یک میکروکانال بررسی می‌شود. میکروکانال از یک ناحیه مارپیچ و یک ناحیه مستقیم ولی تحت اثر امواج آکوستیکی یا صوتی تشکیل شده است. در ناحیه مارپیچ، ذرات تحت اثرات هیدرودینامیکی جداسازی اولیه می‌شوند؛ سپس ذرات وارد ناحیه مستقیم میکروکانال می‌شوند و جداسازی نهایی ذرات تحت تأثیر نیروی ناشی از امواج صوتی صورت می‌گیرد. اثر فرکانس امواج صوتی و تعداد حلقه‌های ناحیه مارپیچ بر جداسازی بررسی می‌شود. نتایج نشان می‌دهد که برای ابعاد و پارامترهای جریان تعیین شده، در فرکانس 1 مگاهرتز موج صوتی و تعداد حلقه‌های 2 برای ناحیه مارپیچ میکروکانال، ذرات در انتهای مسیر، در موقعیت مناسبی برای جداسازی نسبت به یکدیگر قرار دارند. علاوه بر آن، نتایج به‌دست ‌‌آمده نشان می‌دهد که جداسازی ذرات با این سیستم ترکیبی نسبت به روش‌های ساده عملکرد بهتری دارد و نرخ جداسازی می‌تواند 100 درصد نیز باشد.
 

کلیدواژه‌ها

عنوان مقاله [English]

Numerical Simulation of Particle Separation in the Fluid Flow in a Microchannel Including Spiral and Acoustic Regions

نویسندگان [English]

  • F. Shabani
  • M. Saghafian
  • D. Saeidi
  • F. F. Momennasab

چکیده [English]

Particulate separation has many applications in medicine, biology and industry. In this research, the separation of polystyrene particles with a diameter of 10, 20 and 30 μm in the fluid flow of a microchannel is investigated. The microchannel consists of a spiral region and a straight region under the influence of acoustic waves. In the spiral region, the particles under hydrodynamic effects undergo the initial separation; then the particles enter the straight region of the microchannel, and the final separation of the particles is done by the force generated and exerted through the acoustic waves. The effects of acoustic frequency and the number of spiral region loops on separation are investigated. The results show that for measured dimensions and parameters, at 1 MHz acoustic wave, when the number of loops is 2 for the spiral region, the particles at the end of the path are in a suitable position for separation. In addition, the results show that the separation of particles with this hybrid system is better than that done by the simple methods, and the separation rate can be as high as 100%
 

کلیدواژه‌ها [English]

  • Acoustic wave
  • Spiral microchannel
  • Particle separation
  • microfluidics
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