کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
668050 | 1458726 | 2015 | 25 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of nozzle shape on jet impingement heat transfer from a circular cylinder
ترجمه فارسی عنوان
اثر شکل نازل در انتقال حرارت جرم از سیلندر دایره ای
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
ضربه جت، شکل نازل، سیلندر دایره ای انتقال گرما،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
چکیده انگلیسی
Experimental and numerical investigations were carried out to study the effect of nozzle shape on unconfined jet impingement heat transfer from a heated circular cylinder. Air was considered as the working fluid. The heated cylinder surface was maintained at a constant heat flux. In this work, circular, square and rectangular nozzles of equal hydraulic diameters were selected for a comparative study. The Reynolds number, Rehyd defined based on the hydraulic diameter of the nozzle was varied from 10,000 to 25,000. The ratio of hydraulic diameter of the nozzle to the diameter of heated cylinder, dhyd/D was maintained at 0.2 for the parametric study. The non-dimensional distance between the nozzle exit and the cylinder, h/dhyd was varied from 4 to 16. For a fixed jet Reynolds number, the mass flow rates through different nozzles are different. Hence, a parametric study was also carried out to know the effect of nozzle shape for various fixed mass flow rates. For this, a modified Reynolds number Re¯hyd was kept constant for all nozzle shapes. For a fixed jet Reynolds number, heat transfer from the cylinder was higher for the case of rectangular nozzle. On the other hand, for a fixed modified Reynolds number Re¯hyd, heat transfer rate from the cylinder was found to be higher when the circular nozzle was used. For the same geometry, numerical simulations were also carried out using three different two-equation turbulence models. Using the experimental data, two correlations for stagnation Nusselt number Nustag. have also been provided.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Thermal Sciences - Volume 96, October 2015, Pages 45-69
Journal: International Journal of Thermal Sciences - Volume 96, October 2015, Pages 45-69
نویسندگان
Dushyant Singh, B. Premachandran, Sangeeta Kohli,