بررسی اثر جهت قرار گیری هیتر و کولر بر عملکرد یک مدار جابهجایی طبیعی مینیاتوری با نانو سیال آب-مس

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی مکانیک، واحد علی آباد کتول، دانشگاه آزاد اسلامی، علی آباد کتول، ایران

2 باشگاه پژوهشگران جوان و نخبگان، واحد علی آباد کتول ، دانشگاه آزاد اسلامی، علی آباد کتول، ایران

چکیده

هدف اصلی این مقاله، بررسی اثرات جهت قرارگیری هیتر و کولر بر دبی جرمی مدار و توزیع دما در مدار جابه‌جایی طبیعی می‌باشد. برای رسیدن به این هدف، معادلات حاکم بر مدار جابه‌جایی طبیعی- بقاء جرم، مومنتم و انرژی- به صورت بدون بعد نوشته می‌شوند. نانو سیال آب - مس به عنوان سیال عامل در نظر گرفته شده و تأثیر درصد نانو ذرات بر دبی جرمی بررسی می‌گردد. همچنین، اثرات دیگر پارامترها مانند قطر لول ه، ارتفاع مدار، زاویه شیب مدار نسبت به قائم، و توان هیتر بر روی نرخ دبی جرمی مدار و توزیع دما بررسی می‌گردند. نتایج نشان می‌دهد که افزایش 20 درصدی قطر لوله‌های مدار برای تمام جهت‌های قرارگیری هیتر و کولر، به طور متوسط باعث افزایش 43 درصدی دبی جرمی مدار می‌گردد. در توان هیتر 50W ، هنگامی که درصد نانو ذره از مقدار صفر به 2% افزایش می‌یابد، دبی جرمی تقریباً 8/ 12 % افزایش می‌یابد. هنگامی که توان هیتر از 20W به 30W افزایش می‌یابد ) 50 % افزایش( در همه حالت‌ها، دبی جرمی حالت پایا تقریباً 4/ 22 % افزایش می‌یابد. در توان هیتر 20W و با 2% نانو ذره، دما در انتهای هیتر برای حالت هیتر افقی-کولر افقی و برای حالت هیتر عمودی-کولر عمودی به ترتیب 34 oc و 97 oc است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigating the Orientation of the Heater and Cooler on the Performance of a Mini Natural Circulation Loop with Cu-Water Nanofluid

نویسندگان [English]

  • Seyyed Masoud Seyyedi 1
  • A.S. Dogonchi 2
  • Mehdi Hashemi-Tilehnoee 1
1 Department of Mechanical Engineering, Aliabad Katoul Branch, Islamic Azad University, Aliabad Katoul, Iran
2 Young Researchers and Elite Club, Aliabad Katoul Branch, Islamic Azad University, Aliabad Katoul, Iran
چکیده [English]

The main objective of this paper is to investigate the effects of the orientation of    heater and cooler on the mass flow rate and temperature distribution in a natural circulation loop. The governing equations of the natural circulation loop – mass conservation, momentum, and energy- are written in the non-dimensional form. Cu-Water nanofluids considered as the working fluid and the effect of nanoparticles percentage on mass flow rate is investigated. Also, the effects of other parameters such as pipe diameter, height of the loop, loop inclination angle and the heater power on the mass flow rate of the loop and temperature distribution are investigated. The results show the mass flow rate increases 43% when the diameter of pipes increases 20% for all orientations of the heater and cooler. For heater power 50 W, the mass flow rate increases 12.8% almost, when the percentage of nanoparticles increases 2%. The mass flow rate increases 22.4% almost as the power heater increases from 20 W to 30 W (50 % increasing) for all orientations. For heater power 20 W and 2% nanoparticles, the temperature at the end of heater (hot leg) for horizontal heater and horizontal cooler and vertical heater and vertical cooler is 34 ºC, and 97 ºC, respectively.

کلیدواژه‌ها [English]

  • Mini natural circulation loop
  • Mass flow rate
  • Heater and cooler
  • Nanofluid

مراجع

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نشریه مهندسی مکانیک امیرکبیر
دوره 52، شماره 11
بهمن 1399
صفحه 3203-3224

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