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
 
[1] Ostrach, S.) 1988). “Natural convection in enclosures”. Journal of Heat Transfer ,vol. 6, pp. 1175–1190.
[2] Gebhart, B., Jaluria, Y., Mahajan, R.L., Sammakia, B. (1988). “Buoyancy – induced flows and transport”. Hemisphere Publishing Corporation, New York, pp. 1001.
[3] Sezai, I., Mohamad, A. A. (2000). “Natural convection from a discrete heat source on the bottom of a horizontal cavity”. Int. J. Heat Mass Transfer, Vol. 43, pp. 2257–2266.
[4] Saravanan, S., Sivaraj, C. (2011). “Natural convection in an enclosure with a localized non uniform heat source on bottom wall”. International Journal of heat and mass transfer, Vol. 54, pp. 2820-2828.
[5] Sarris, I.E., Lekakis, I., Vlachos, N.S. (2004). “Natural convection in rectangular tanks heated locally from below”. Int. J. Heat Mass Transfer, Vol. 47,pp .3549–3563.
[6] Calcagni, B., Marsili, F.and  Paroncini ,M. (2005) “Natural convective heat transfer in square enclosures heated from below”. Appl. Therm. Eng, Vol. 25, pp.2522–2531.
[7] Deng, Q. H. Tang, G. F. Li, Y. ( 2002). “A combined temperature scale for analyzing natural convection in rectangular enclosures with discrete wall heat sources”. Int J Heat Mass Transfer, No. 45, pp. 3437-3446.
[8] Aminossadati S. M., Ghasemi B.(2009). “Natural Convection Cooling of a Localised Heat Source at the Bottom of a Nanofluid-Filled Enclosure’’ , European Journal of Mechanics B/Fluids, No. 28, pp. 630–640.
[9] Pishkar I., Ghasemi B. (2012). “Chimney Cooling enhancement of two fins in a horizontal channel by nanofluid mixed convection’’. International Journal of Thermal Sciences, Vol. 59, pp. 141-151.
[10] Oztop H. F., Abu-Nada E. (2008). “Numerical Study of Natural Convection in Partially Heated Rectangular            Enclosures Filled with Nanofluids”. International Journal of Heat and Fluid Flow, No. 29, pp. 1326–1336.
 [11] Abu-Nada, E. Oztop, H. F. (2009). “Effects of Inclination Angle on Natural Convection in Enclosures Filled with Cu–Water Nanofluid”. Int. J. Heat and Fluid Flow, Vol. 30, pp. 669–678.
 [12] Aminossadati S.M. and Ghasemi B. (2011). “Natural convection of water–CuO nanofluid in a cavity with two pairs of heat source-sink”. Int. Commun. Heat Mass Transfer, Vol. 38,  pp. 672–678.
[13] Sheikhzadeh, G.A.  Arefmanesh, A. Kheirkhah, M.H. Abdollahi, R. (2011). ”Natural convection of Cu-water nanofluid in a cavity with partially active side walls”. European Journal of Mechanics B/Fluids, Vol. 30, pp. 166-176.
[14] Ghasemi, B. Aminossadati, S.M. (2010). “Mixed convection in a lid-driven triangularenclosure filled with nanofluids”.  Int. Commun. Heat Mass Transfer, Vol. 37 , pp. 1142-1148.
[15]  Brinkman, H.C. (1952). “The Viscosity of Concentrated Suspensions and Solution” . J. Chem. Phys, Vol. 20, pp. 571–581.
[16] Maxwell, J. A. (1904). “Treatise on Electricity and Magnetism, Second ed. Oxford University Press”. Cambridge, UK,
[17]-De Vahl Davis, G. (1983). “Natural convection of air in asquare cavity :a Benchmark solution”.  Int J NumeMeth Fluids, Vol. 3, pp. 249-264.
[18] Fusegi,T. Hyun, J. M. Kuwahara, K. Farouk, B. (1991). ”A numerical study of three-dimensional natural   convection in a differentially heated cubical enclosure”. Int. J. Heat Mass Transfer, Vol. 34, pp. 1543-1557.