شبیه سازی عددی دینامیک گلبول قرمز خون در یک میکروکانال با مانع پله‌ای با استفاده از روش شبکه بولتزمن- مرز غوطه ور

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار، گروه مهندسی مکانیک، دانشگاه صنعتی ارومیه، ارومیه، ایران

2 دانشجوی کارشناسی ارشد، گروه مهندسی مکانیک، دانشگاه صنعتی ارومیه، ارومیه ایران

چکیده

در مطالعه حاضر، دینامیک یک گلبول قرمز در میکروکانال دوبعدی ساده و میکروکانال دارای مانع پله­ای، با استفاده از ترکیب روش شبکه بولتزمن و روش مرز غوطه­ور شبیه­سازی می­گردد. گلبول قرمز به صورت یک مرز انعطاف­پذیر غوطه­ور در جریان سیال در نظر گرفته می­شود. اثرات تغییر لزجت پلاسما بر حرکت و تغییر شکل گلبول قرمز بررسی شد. در ادامه حرکت گلبول قرمز دایروی در جریان پوازیه بررسی گردید. با توجه به این که گلبول در مرکز کانال قرار دارد و جریان متقارن محوری است بین نیروهای برآی عمل کننده از بالا و پایین روی گلبول، تعادل برقرار است. با عبور دادن گلبول از یک مانع پله­ای در دو حالت گلبول طبیعی و گلبول با تغییر شکل پذیری پایین، مشاهده شد که گلبول طبیعی سرعت و تغییر شکل بیشتری دارد. به علاوه، به دلیل ضرایب کششی و خمشی پایین­تر، گلبول طبیعی حرکت tank-treading را تجربه می­کند در حالی که برای گلبول با تغییر شکل­پذیری کم، حرکت tumbling اتفاق می­افتد. نتایج حاصل با نتایج عددی موجود مقایسه گردید که تطابق نسبتاً خوبی را نشان داد.

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