کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
652666 885036 2008 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Approximations to energy and temperature dissipation rates in the far field of a cylinder wake
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Approximations to energy and temperature dissipation rates in the far field of a cylinder wake
چکیده انگلیسی

Approximations to energy and temperature dissipation rates, denoted as εap and χap, are obtained using a probe consisting of four hot wires and a pair of parallel cold wires. The performance of the probe in measuring velocity and temperature derivatives and vorticity has been checked satisfactorily by comparing with isotropic calculations. Local isotropy across the wake is examined. The results show that in the region of x2/L ⩽ 1, local isotropy is approximately satisfied. When x2/L further increases, the departure from local isotropy becomes apparent. The differences between the present approximations of the two dissipation rates and those obtained by using isotropic relations are discussed in terms of their corresponding spectra and the correlation coefficient with respect to different longitudinal separations r. The correlations between the two dissipation fields and the enstrophy are also examined. Whereas εap is strongly correlated with ω32, the correlation between ω32 and χap is small.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Experimental Thermal and Fluid Science - Volume 32, Issue 3, January 2008, Pages 791–799
نویسندگان
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