کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
764528 896990 2011 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Experimental study of forced convection from helical coiled tubes with different parameters
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی (عمومی)
پیش نمایش صفحه اول مقاله
Experimental study of forced convection from helical coiled tubes with different parameters
چکیده انگلیسی

The forced convection from outside surfaces of helical coiled tubes is studied experimentally with a constant wall heat flux. Ten helical coiled-tubes of different parameters with a range of diameter ratio (D/do) ranged from 7.086 to 16.142 and pitch ratio (P/do) ranged from 1.81 to 3.205 are employed in the present study. The experiments are performed in an open-circuit airflow wind tunnel system operated in suction mode. The experiments covered a range of Reynolds number (Re) of 6.6 × 102 to 2.3 × 103. The experimental results indicated that these parameters (D/do and P/do) have important effects on the average heat transfer coefficient. The average Nusselt number (Num) increases with the increase of D/do at constant Re and P/do. Also, Num increases with the increase of P/do at constant Re and D/do. A considerable agreement between the present experimental data and previous work is achieved. The average Nusselt numbers is correlated with Re, D/do and P/do.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Energy Conversion and Management - Volume 52, Issue 2, February 2011, Pages 1150–1156
نویسندگان
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