کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
645289 | 1457140 | 2015 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Mixed convective heat transfer of CO2 at supercritical pressures flowing upward through a vertical helically coiled tube
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
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![عکس صفحه اول مقاله: Mixed convective heat transfer of CO2 at supercritical pressures flowing upward through a vertical helically coiled tube Mixed convective heat transfer of CO2 at supercritical pressures flowing upward through a vertical helically coiled tube](/preview/png/645289.png)
چکیده انگلیسی
The mixed convective heat transfer of CO2 at supercritical pressures inside a vertical helically coiled tube was experimentally investigated under constant heat flux conditions. Experiments were conducted at three supercritical pressures for various heat and mass fluxes. The buoyancy force was found to have two opposing effects on the heat transfer. When Boââ¤4Ã10â8, the forced convection is dominant, and the density is only reduced at the near-wall region, which leads to flow acceleration, relaminarization of the turbulence, and deterioration of the heat transfer. When 4Ã10â88Ã10â7, the natural convection is fully developed, and the relaminarization of the turbulence at the near-wall region is suppressed, which enhances the heat transfer. The coupling effects of the buoyancy force, centrifugal force, and variations in the physical properties were found to determine the temperature and heat transfer coefficient distributions along the circumference edges. Based on the current experimental data, two correlations of the Nusselt number were presented.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Thermal Engineering - Volume 88, 5 September 2015, Pages 61-70
Journal: Applied Thermal Engineering - Volume 88, 5 September 2015, Pages 61-70
نویسندگان
Wei Zhang, Shuxiang Wang, Changda Li, Jinliang Xu,