کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
648732 1457201 2009 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Heat transfer in rotating scale-roughened trapezoidal duct at high rotation numbers
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Heat transfer in rotating scale-roughened trapezoidal duct at high rotation numbers
چکیده انگلیسی
An experimental study of heat transfer in a radially rotating trapezoidal duct with two bevel walls roughened by deepened scales is performed with cooling applications to gas turbine rotor blades. Laboratory scale heat transfer data along the centerlines of two scale-roughened walls is generated within the parametric ranges of 7500 ⩽ Re ⩽ 15,000, 0 ⩽ Ro ⩽ 1.8 and 0.13 ⩽ Δρ/ρ ⩽ 0.42. No previous study has examined the heat transfer in a rotating scale-roughened channel and the present Ro range extends considerably from other researches to date. A selection of experimental data illustrates the individual and interactive impacts of Re, Ro and buoyancy number (Bu) on local heat transfer through which the manners of isolated and synergetic influences of Coriolis force and rotating buoyancy on heat transfer are examined. Local Nusselt number ratios between rotating and static channels on the stable (leading) and unstable (trailing) scale-roughened surfaces with Ro varying from 0.1 to 1.8 fall in the ranges of 0.8-2 and 1.1-2.5, respectively. Rotating buoyancy effects are weakened as Ro increases that impair local heat transfer for the present test configurations. Empirical heat transfer correlations for developed flow regions on two scale-roughened surfaces are derived that permit the evaluation of interactive and individual effects of Re, Ro and Bu on local heat transfer.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Thermal Engineering - Volume 29, Issues 8–9, June 2009, Pages 1682-1693
نویسندگان
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