کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8942014 | 1645051 | 2018 | 21 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Thermosolutal hydromagnetic convection of power law fluids in an enclosure with periodic active zones
ترجمه فارسی عنوان
حرارتی هیدرومغناطیسی حرارتی آلومینیومی از سیالات قدرت قانون در یک محفظه با مناطق فعال دوره ای
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کلمات کلیدی
مدل قانون قدرت پودر طبیعی منابع گرمای گسسته، روش عددی، آنتروپی تجزیه و تحلیل نسل،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
چکیده انگلیسی
A finite volume technique based double diffusive natural convection of power-law fluid in an enclosure has been studied numerically in the presence of magnetic field due to different physical parameters such as Rayleigh number (Ra), Lewis number (Le), Hartmann number (Ha) and Prandtl number (Pr). The flow is generated by the combined mechanism of a time periodic thermal and solutal gradient acts along the vertical walls. The combined buoyancy effect due to thermal and species diffusion plays a key role on the flow characterisation. The study dealt with the effect of pertinent parameters on fluid flow, heat and mass transfer in case of a laminar flow regime. The apparent power law indices and magnetic field strengths are varied using the non-Newtonian power law forms. The relevant results are presented in terms of streamlines, isotherms, isoconcentrations, average Nusselt number, Sherwood number and total entropy generation with the variation of power law index (n) from 0.2 to 1.8, Ra from 104 to 105,Ha from 0 to 20, Pr from 1 to 5 and buoyancy ratio (N) from -1 to 1. The entropy generation and Bejan number are determined to analyze the thermodynamic optimization of the conjugate double diffusive convection. It is observed that the average Nusselt and Sherwood number shows linear variation with the increase of amplitudes of the imposed sinusoidal temperature and concentration gradient and the fluctuation is found to be trivial. Also the results indicate that the power law index variation influences largely the rate of heat and mass transfer and average entropy generation. The magnetic field strength increases the strength of the fluid flow and also strongly supported by the increased values of n. It is found that with the decrement of flow behavior index n the buoyancy effect and the hydrodynamic behavior of the fluid is getting increased.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 127, Part C, December 2018, Pages 622-642
Journal: International Journal of Heat and Mass Transfer - Volume 127, Part C, December 2018, Pages 622-642
نویسندگان
A. Haque, A.K. Nayak, Bharat Soni, M. Majhi,