کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
7053558 1457610 2017 13 صفحه PDF سفارش دهید دانلود رایگان
عنوان انگلیسی مقاله ISI
Large-eddy simulations of heat transfer in asymmetric rib-roughened ducts: Effects of rotation
ترجمه فارسی عنوان
شبیه سازی های بزرگ انتقال گرما در کانال های روتاری نامتقارن: اثر چرخش
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موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی
We report on large-eddy simulations (LES) of the effects of system rotation on heat transfer in a fully-developed flow in an asymmetrically-ribbed rectangular duct at Re=DhU0ν=15000 where Dh is the hydraulic diameter and U0 the bulk flow velocity. The bottom duct wall, ribbed by flow-normal, equally-distanced square-sectioned ribs, was uniformly heated (except for the ribs) with an imposed constant heat flux. The duct was rotated with a spanwise angular velocity Ω corresponding to two rotation number Ro=ΩDhU0=±0.3, destabilising and stabilising respectively the ribbed-wall adjacent flow. The computational method and the treatment of heat transfer were verified and validated in prior simulations of generic well-documented reference configurations, rotating plane channel and non-ribbed duct flows. The well-resolved LES gave some new insight into the rotation effects on flow and heat transfer, providing information that are not easily accessible to experiments. An attempt is made to identify and distinguish the physical mechanisms of heat transfer enhancement and suppression by system rotation, rib-induced modifications of secondary motion, and the direct effects on the turbulence statistics, especially on the budgets of the turbulent kinetic energy, temperature variance and turbulent heat flux components.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Fluid Flow - Volume 68, December 2017, Pages 373-385
نویسندگان
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