کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5490260 | 1524779 | 2017 | 45 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
MHD nanofluid free convection and entropy generation in porous enclosures with different conductivity ratios
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
MHD natural convection of Cu-water nanofluid in a square porous enclosure is investigated using a parallel LBM code, considering temperature dependence of viscosity and viscous dissipation. Effects of nanofluid concentration (Ï=0-0.12), Rayleigh (Ra =103-106), Hartmann (Ha = 0-20) and porous-fluid thermal conductivity ratio (Kâ = 1-70) on heat transfer and entropy generation are investigated. It is shown that Kâ is a very important parameter, and porous media with low Kâ numbers can confine convection effects, but by increasing Kâ both conduction and convection effects can substantially improve. Also, magnetic field always has negative impact on Nu, however this impact can be controlled by Ï and Kâ. A magnetic instability has also observed in Ra = 104, and Nu exhibits a sinusoidal variation with Ha. It is proved that, depending on Kâ, Ra and Ha values, use of nanofluid with porous media to enhance heat transfer can be either beneficial or detrimental. Also, for given Kâ, Ra and Ha numbers an optimal Ï exists to improve heat transfer. Finally, entropy generation study performed and results state that in low and high Ra values the thermal and frictional entropy generation are respectively dominant, while for moderate Ra they have the same order of magnitude.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 442, 15 November 2017, Pages 474-490
Journal: Journal of Magnetism and Magnetic Materials - Volume 442, 15 November 2017, Pages 474-490
نویسندگان
Kasra Ghasemi, Majid Siavashi,