جابجایی آزاد نانوسیال آب-آلومینا در یک محفظه مربعی حاوی دو جفت چشمه و چاه

نوع مقاله : پژوهشی

نویسندگان

دانشگاه شهرکرد

چکیده

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مقاله
حاضر انتقال حرارت جابجایی طبیعی درون یک محفظه مربعی با دو جفت چشمه و چاه روی
دیواره­های افقی بالائی و پائینی حاوی نانو سیال آب-آلومینا را به صورت عددی مورد
مطالعه قرارداده است. چشمه و چاه حرارتی به ترتیب دارای دماهای Th و Tc  می
باشند. معادلات حاکم بر جریان توسط یک برنامه کامپیوتری که به زبان فرترن، بر اساس
روش حجم کنترل و الگوریتم سیمپل نوشته شده است، حل شده اند. اثر پارامترهایی نظیر
کسر حجمی نانوسیال از 0 تا 0/05،  اعداد
ریلی 103،104،105 و106 و تغییر
موقعیت دو جفت چشمه و چاه بر میدان جریان و دما و نرخ انتقال حرارت مورد بررسی
قرار گرفته است. نتایج بدست آمده نشان می­دهد با افزایش عدد ریلی و کسر حجمی
نانوذرات میزان انتقال حرارت افزایش می­یابد. همچنین نتایج نشان می دهد افزایش کسر
حجمی نانو ذرات در اعداد ریلی پائین (103و104) اثر افزایشی
بیشتری در نوسلت موضعی و متوسط در مقایسه با اعداد ریلی بالا (105و106)
دارد. gte mso 9]>

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کلیدواژه‌ها


عنوان مقاله [English]

Water-Alomina nanofluid natural convection in a square cavity with two pairs of source-sink

نویسندگان [English]

  • moslem ghasemi
  • behzad ghasemi
  • afrasyab raisi
چکیده [English]

This paper presents a numerical study on the natural convection in a square cavity, with two pair of heat source and sink and filled with a alumina-water nanofluid. heat source and sink have Th and Tc temperatures respectively. For this purpose, we used a Fortran program based on Finite Volume Method and SIMPLE algorithm. The effects of parameters such as volume fraction for 0 to 0.05 percent, Rayleigh number for 103,104, 105 and 106 and location of two pair of source-sink on the flow and temperature fields and heat transfer rate have been examined. The obtained results show that by increasing the Rayleigh number and the volume fraction of the nanoparticles, the rate of heat transfer is increased. Also, The results show that, increasing the nanoparticles volume fraction at low Rayleigh numbers (103,104) has the more enhancement effect on the local and average Nusselt number in compared to the high Rayleigh ‌numbers(105,106).

کلیدواژه‌ها [English]

  • Nanofluid
  • Natural convection
  • Square Cavity
  • Heat source-sink
  • numerical study
 
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