آنالیز میرایی فیلم نازک سیال در تشدیدکننده های محرک-شانه‌ای مدور با درنظر گرفتن شرایط مرزی لغزش

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار، گروه مهندسی مکانیک، دانشکده فنی مهندسی خوی، دانشگاه ارومیه، ارومیه، ایران

2 استاد، گروه مهندسی مکانیک، دانشگاه ارومیه، ارومیه، ایران

چکیده

در این مقاله میرایی فیلم نازک سیال در ریزتشدیدکننده های محرک-شانه‌ای مدور با درنظر گرفتن شرایط مرزی لغزش مورد بررسی قرار می‌گیرد. مدل پیشنهادی، شامل یک دندانه متحرک صلب به شکل میکرو صفحه یک سرگیردار می‌باشد که توسط دندانه های ثابت در بالا و پایین آن احاطه شده است. میکرو فاصله بین دندانه متحرک و دندانه های ثابت با سیال هوا پر شده است. معادلات حاکم بر ارتعاش طولی میکرو دندانه و همین طور حاکم بر میدان سیال با درنظر گرفتن فرضیات مناسب استخراج و پس از بی‌بعد سازی با بکارگیری روش عددی گلرکین جداسازی و بصورت عددی حل می‌شوند. هدف از حل معادلات، بدست آوردن فرکانس های میرایی و در نهایت ضریب میرایی معادل سیستم می‌باشد. سپس اثرات پارامترهای هندسی تشدیدکننده از جمله طول، ضخامت دندانه و همین طور اندازه شکاف سیال روی پاسخ سیستم مورد بررسی قرار می‌گیرد. همین طور بررسی اثرات لغزش سیال در سطوح مرزی نشان می‌دهد که لغزش سیال در نقاط مرزی باعث افزایش آزادی و دامنه حرکت مولکولهای سیال در مرز سیال-جامد شده و به تبع آن فاکتور کیفیت سیستم افزایش می‌یابد.

کلیدواژه‌ها

موضوعات


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