بررسی عددی جابجایی اجباری در یک میکروکانال با وجود شرط لغزش و در حضور نانوسیال

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه مهندسی مکانیک، دانشکده فنی و مهندسی، دانشگاه شهرکرد، شهرکرد، ایران

چکیده

تجهیزات در حد میکرو دارای مزایای بسیار زیادی از جمله بازده گرمایی بالا، نسبت سطح انتقال گرما به حجم زیاد، اندازه کوچک، وزن کم، سیال موردنیاز کم و انعطاف‌پذیری بالای طراحی هستند. در پژوهش حاضر، جریان سیال درون میکروکانال با فرض جریان آرام، تراکم‌ناپذیر و دو بعدی مدل شده است. شرط لغزش روی دیوارها اعمال شده و خروجی کانال به صورت توسعه یافته در نظر گرفته شده است. تأثیر پارامترهای مختلفی همچون ضریب لغزش بی‌بعد، عدد رینولدز و کسر حجمی نانوسیال مورد بررسی قرار گرفته است. نتایج بدست آمده نشان می‌دهد که مقدار سرعت در ضریب لغزش بین صفر و 04/0 از مقدار سرعت در ضریب لغزش بین 04/0 و 08/0 بیشتر است. همچنین، هرچه عدد رینولدز بیشتر می‌شود محلی که قرار است توسعه‌یافتگی حرارتی صورت گیرد به سمت مرکز کانال و به طرف خروجی کانال حرکت می‌کند. در عدد رینولدز 10 دمای سیال به‌ علت سرعت کم آن سریعا افزایش می‌یابد و ضریب لغزش تاثیر زیادی بر پروفیل سرعت ندارد. در حالی‌که در مقادیر بالای عدد رینولدز، پروفیل دما برای ضرایب سرعت لغزشی تاثیری بیشتری دارد. طبق نتایج بدست آمده با افزایش درصد کسر حجمی نانوسیال مقدار انتقال حرارت افزایش می‌یابد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Numerical study of forced convection in a microchannel in the presence of nanofluid using the slip condition

نویسندگان [English]

  • Afshin Ahmadi Nadooshan
  • Dariush Bahrami
  • Morteza Bayareh
Department of Mechanical Engineering, Shahrekord University, Shahrekord, Iran
چکیده [English]

Micro-scale equipment has many advantages such as high thermal efficiency, high heat transfer surface-to-volume ratio, small size, lightweight, low required fluid, and high design flexibility. In the current study, the fluid flow inside the microchannel is modeled by assuming laminar, incompressible, and two-dimensional flow. The slip boundary condition is applied on the walls and the outlet of the channel is considered as fully developed. The effect of various parameters such as dimensionless slip coefficient, Reynolds number, and volume fraction of nanofluid is examined. The obtained results demonstrate that the velocity for the slip coefficient between 0 and 0.04 is higher than that for the slip coefficient between 0.04 and 0.08. Also, as the Reynolds number increases, the place where thermal development is supposed to occur moves towards the center of the channel and towards the outlet of the channel. At a Reynolds number of 10, the temperature of the fluid is enhanced rapidly due to its low velocity, and the slip coefficient does not have a large effect on the velocity profile. At high Reynolds numbers, the temperature profile has a greater effect on the slip velocity coefficient. According to the results, the amount of heat transfer is increased with the volume fraction of the nanofluid.

کلیدواژه‌ها [English]

  • Microchannel
  • Slip Coefficient
  • Nanofluid
  • Thermal Development
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