کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
669603 1458799 2009 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Turbulent film condensation in the presence of non-condensable gases over a horizontal tube
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Turbulent film condensation in the presence of non-condensable gases over a horizontal tube
چکیده انگلیسی

A numerical model is presented for studying turbulent film condensation in the presence of non-condensable gases over a horizontal tube. Inertia, pressure gradient are included in this analysis, and the influence of turbulence in the proposed two-phase model is considered. The numerical results demonstrate that a very small bulk concentration of non-condensable gas reduces the heat transfer coefficient and film thickness considerably. The local heat flux and film thickness increase as tube surface temperature decreases at any bulk concentration of non-condensable gas. Moreover, inlet velocity increases as film thickness decreases and heat flux increases, a numerical result in agreement with that obtained by Nusselt. Numerical results indicate that average dimensionless heat transfer coefficients are in good agreement with theoretical and experimental data.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Thermal Sciences - Volume 48, Issue 9, September 2009, Pages 1777–1785
نویسندگان
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