بررسی اثر میدان مغناطیسی مورب بر جابجایی آزاد نانوسیال در یک محفظه مربعی با دو چشمه حرارتی متغیر

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار، گروه مهندسی مکانیک، واحد الیگودرز، دانشگاه آزاد اسلامی، الیگودرز، ایران

2 استاد ، دانشکده فنی و مهندسی دانشگاه جامع امام حسین (ع)، تهران، ایران

3 کارشناسی ارشد، گروه مهندسی مکانیک، واحد الیگودرز، دانشگاه آزاد اسلامی، الیگودرز، ایران

چکیده

در این پژوهش انتقال حرارت جابجایی آزاد برای محفظه مربعی شکل حاوی دو نانوسیال آب-آلومینا و آب-مس که تحت تأثیر میدان مغناطیسی مورب قرار دارد به روش عددی شبیه­سازی شده و تأثیر پارامترهایی مانند عدد رایلی ( )، عـــدد هارتمن ( )، زاویه میدان مغناطیسی ( )، کسر حجــمی نانــوذرات ( )، نوع منبع حرارتی (خطی یا سینوسی)، طول منبع حرارتی ( ) و پارامتر غیریکنواختی چشمه ( )، بر روی میدان‌های جریان و دما مورد مطالعه قرار گرفته‌ است. نتایج به‌دست‌آمده نشان می‌دهند که با افزایش عدد رایلی و عدد هارتمن، میزان انتقال حرارت به ترتیب افزایش و کاهش می‌یابد. همچنین عملکرد حرارتی محفظه با افزایش زاویه میدان مغناطیسی (از 0 تا 90 درجه) بهبود می­یابد و با افزودن نانوذرات جامد به سیال پایه افزایش نسبی انتقال حرارت در محفظه مشاهده می­شود. در اعداد رایلی بالا و پایین، بیشینه انتقال حرارت مربوط به چشمه دما ثابت می‌باشد و پس از آن برای اعداد رایلی بالا چشمه سینوسی با  و برای اعداد رایلی پایین، که انتقال حرارت هدایت بر محفظه حاکم است، چشمه خطی با  دارای بیشترین عدد ناسلت متوسط می‌باشند. با بررسی طول منابع حرارتی می­توان دریافت که با افزایش طول چشمه­ها، میزان انتقال حرارت افزایش می‌یابد.

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سابقه مقاله

  • تاریخ دریافت: 09 اسفند 1400
  • تاریخ بازنگری: 31 تیر 1401
  • تاریخ پذیرش: 13 شهریور 1401
  • تاریخ انتشار: 30 شهریور 1401

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