کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7054253 1458016 2018 15 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Laminar mixed convection of power-law fluids in cylindrical enclosures with heated rotating top wall
ترجمه فارسی عنوان
مخلوط سازه های مخلوطی از مایعات قدرت قانون در مخازن استوانه ای با دیوار بالا چرخش گرم
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی
Laminar mixed convection of inelastic non-Newtonian fluids obeying a power law model in a cylindrical enclosure with a heated rotating top cover has been investigated numerically in this study. The steady-state axisymmetric simulations have been carried out for a range of different nominal Reynolds, Prandtl, Richardson numbers (i.e. 500⩽Re⩽2000;10⩽Pr⩽500 and 0⩽Ri⩽1) and power-law index (i.e. 0.6⩽n⩽1.8) for an aspect ratio (height/radius) of unity (i.e. AR=1.0). It has been found that mean Nusselt number Nu‾ increases as Re and Pr increase, whereas Nu‾ decreases with increasing values of Ri for shear-thinning (i.e. n<1), Newtonian (i.e. n=1) and shear-thickening (i.e. n>1) fluids. It has also been observed that the variation of Nu‾ with n differs depending on the values of Re and Ri. For instance, for small values of Reynolds number, Nu‾ exhibits a non-monotonic trend (i.e. increases before reaching a maximum followed by a decreasing trend) with increasing n for small values of Richardson number, whereas Nu‾ monotonically increases with increasing values of n for high Richardson number cases. However, in the case of high Reynolds number, Nu‾ increases with n before reaching a maximum value which is followed by a decreasing trend for all values of Ri considered here. Detailed physical explanations are provided for the influences of Re, Pr, Ri, and n on Nu‾ based on an elaborate scaling analysis. Finally, the numerical findings have been used to propose a correlation for Nu‾ for the ranges of Re,Pr,Ri,n considered here.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 124, September 2018, Pages 885-899
نویسندگان
, , , ,