کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1554107 998769 2012 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Numerical investigation of natural convection heat transfer of nanofluids in a Γ shaped cavity
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
Numerical investigation of natural convection heat transfer of nanofluids in a Γ shaped cavity
چکیده انگلیسی

This paper analyzes the heat transfer and fluid flow of natural convection in a Γ shaped enclosure filled with Al2O3/Water nanofluid that operates under differentially heated walls. The Navier–Stokes and energy equations are solved numerically. Heat transfer and fluid flow are examined for parameters of non-uniform nanoparticle size, mean nanoparticle diameter, nanoparticle volume fraction, Grashof number and different geometry of enclosure. Finite volume method is used for discretizating positional expressions, and the forth order Rung-Kuta is used for discretizating time expressions. Also an artificial compressibility technique was applied to couple continuity to momentum equations. Results indicate that using nanofluid causes an increase in the heat transfer and the Nusselt number so that for R = 0.001 in Gr = 103, the Nusselt number 25%, in Gr = 104 26%, and in Gr = 105 28% increases. Furthermore; by decreasing the mean diameters of nanoparticles, Nusselt number increases. By increasing R parameter (dp,min/dp,max) and nano particle volume fraction, Nusselt number increases.


► Using nanofluid causes an increase in the heat transfer and the Nusselt number.
► By decreasing the mean diameters of nanoparticles, Nusselt number increases.
► By increasing nano particle volume fraction, Nusselt number increases.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Superlattices and Microstructures - Volume 52, Issue 2, August 2012, Pages 312–325
نویسندگان
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