دانلود مقاله ISI انگلیسی شماره 153819
ترجمه فارسی عنوان مقاله

انتقال حرارت در سطوح ساختاری توپوگرافی برای مایعات قانون قدرت

عنوان انگلیسی
Heat transfer on topographically structured surfaces for power law fluids
کد مقاله سال انتشار تعداد صفحات مقاله انگلیسی
153819 2018 15 صفحه PDF
منبع

Publisher : Elsevier - Science Direct (الزویر - ساینس دایرکت)

Journal : International Journal of Heat and Mass Transfer, Volume 121, June 2018, Pages 857-871

ترجمه کلمات کلیدی
انتقال گرما، سطوح میکرو سازگار، سیگنال قانون قدرت جریان آرام، دینامیک سیالات محاسباتی، زبری سطح،
کلمات کلیدی انگلیسی
Heat transfer; Micro structured surfaces; Power law fluid; Laminar flow; Computational fluid dynamics; Surface roughness;
پیش نمایش مقاله
پیش نمایش مقاله  انتقال حرارت در سطوح ساختاری توپوگرافی برای مایعات قانون قدرت

چکیده انگلیسی

The results indicate that the global heat transfer performance can be improved or reduced by the roughness elements at the expense of pressure head when compared with the smooth channels. The maximum heat transfer performance has been obtained for triangular roughness shapes with the relative roughness height of 0.333. In most cases heat performance is smaller than unity. It is also revealed that for the sinusoidal and triangular cases by decreasing the relative roughness width, heat transfer performance is improved. Furthermore, the effects of the roughness features and the channel separation are intensified in power-law fluids. For dilatant fluids with a power-law index equal to n = 1.25, channel separation ratio reduction causes a steep rise in normalized friction factor up to 140.8 in the rectangular case. By increasing the relative roughness pitch of the cases with rectangular elements and the power-law index of n = 0.75, a reasonable heat transfer performance enhancement has been observed.