کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
662178 1458134 2009 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Impingement of an impact jet onto a spherical cavity. Flow structure and heat transfer
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Impingement of an impact jet onto a spherical cavity. Flow structure and heat transfer
چکیده انگلیسی
An experimental study of flow characteristics and heat transfer for jet impingement cooling of obstacles in the form of single spherical cavities is reported. The distributions of flow velocities between the nozzle and the obstacle, and also the fields of pressure and heat-transfer coefficients inside the cavity were measured. It is found that, at a value of depth the cavity generates the large-scale toroidal vortex, essentially influencing on the heat transfer. The cavity flow becomes unstable, exhibiting low-frequency pulsations of local heat fluxes. In the examined ranges of Reynolds numbers, Re = (1.2-5.8)104, and cavity depths (equal to or smaller than 0.5Dc) the local heat-transfer intensity in the cavity is lower than that on a flat obstacle; yet, this reduction is almost fully compensated by increased area of the heat-exchanging surface.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 52, Issues 11–12, May 2009, Pages 2498-2506
نویسندگان
, , , ,