کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
232191 1427460 2008 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Heat transfer characteristics of a supercritical fluid flow in a vertical pipe
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Heat transfer characteristics of a supercritical fluid flow in a vertical pipe
چکیده انگلیسی

This paper explores the criterion on the similarity of heat transfer of supercritical fluid flow in vertical pipes at different diameters by performing comparative experiments. The diameter of the pipe is chosen at 4.4 or 9.0 mm with a heated length of 2 m. The mass flux and wall heat flux are at (400 kg/m2 s, 30 kW/m2), (400 kg/m2 s, 50 kW/m2) (1200 kg/m2 s, 50 kW/m2) with a pressure at 8.12 MPa. By measuring the inlet fluid temperature and wall temperatures, heat transfer coefficients are obtained at various inlet fluid conditions. Analytical criterion for the similarity of the heat transfer behavior is proposed and the validity of the analytical criterion is examined by comparing it with the experimental observations. It is shown that by having same length to diameter ratio and wall heat flux to mass flux ratio a similarity of heat transfer behavior was maintained both in the normal heat transfer mode and deteriorated heat transfer mode. It is also noted that the flow at bigger diameter is more susceptible to the reduction in the heat transfer due to buoyancy.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: The Journal of Supercritical Fluids - Volume 44, Issue 2, March 2008, Pages 164–171
نویسندگان
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