کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5490321 1524791 2017 40 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Mixed convection of magnetohydrodynamic nanofluids inside microtubes at constant wall temperature
ترجمه فارسی عنوان
مخلوط مخلوطی از نانوسیمهای مغناطیسی هیدرویدیامیک در داخل میکروتوبها در دمای دیواره ثابت
کلمات کلیدی
اثر میدان مغناطیسی، نرخ انتقال حرارت غیرمستقیم، نانو سیال، مهاجرت نانو ذرات، ترموفورز، حرکت براونیا،
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
چکیده انگلیسی
Laminar fully developed mixed convection of magnetohydrodynamic nanofluids inside microtubes at a constant wall temperature (CWT) under the effects of a variable directional magnetic field is investigated numerically. Nanoparticles are assumed to have slip velocities relative to the base fluid owing to thermophoretic diffusion (temperature gradient driven force) and Brownian diffusion (concentration gradient driven force). The no-slip boundary condition is avoided at the fluid-solid mixture to assess the non-equilibrium region at the fluid-solid interface. A scale analysis is performed to estimate the relative significance of the pertaining parameters that should be included in the governing equations. After the effects of pertinent parameters on the pressure loss and heat transfer enhancement were considered, the figure of merit (FoM) is employed to evaluate and optimize the thermal performance of heat exchange equipment. The results indicate the optimum thermal performance is obtained when the thermophoresis overwhelms the Brownian diffusion, which is for larger nanoparticles. This enhancement boosts when the buoyancy force increases. In addition, increasing the magnetic field strength and slippage at the fluid-solid interface enhances the thermal performance.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 430, 15 May 2017, Pages 36-46
نویسندگان
, , , ,