کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7045225 1457091 2018 43 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Investigation of convection heat transfer coefficient of circular cross-section short pipes in hot stamping dies
ترجمه فارسی عنوان
بررسی ضریب انتقال حرارت حرارتی لوله های کوتاه مقطع دایره ای در قالب های داغ مهر زنی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی
Since the cooling system design in hot stamping dies is an important issue in hot stamping technology, the heat transfer characteristics between water flow and the inner wall of pipes becomes particularly important for its remarkable effect on hot stamping process. In order to investigate the heat transfer characteristics between H13 tool steel and the water flow in hot stamping dies, a self-developed Convection Heat Transfer Coefficient (CHTC) measuring equipment was established based on a circular cross-section short pipe model. To calculate the CHTC, an analytical calculating method named Fourier equation method based on experimental data and a numerical simulation method were introduced. To further investigate the influence of different factors including inlet fluid mass flow rate, inlet fluid temperature, inlet fluid turbulence intensity, pipe diameter, surface roughness and the furnace temperature on the CHTC, more numerical simulations were implemented, together with the ANOVA analysis. And results showed that the obtained simulation temperature field was in good agreement with the experiment, and the calculated CHTC values distilled from the simulation results were matched well with that of experiment, too. Moreover, all the investigated factors were found to have significant influence on the CHTC value, and the top three factors are inlet fluid mass flow rate, inlet fluid temperature and inner pipe surface roughness. Finally, a novel threaded pipe applied in hot stamping die was introduced derived from the ideal of improving inner pipe surface roughness, which was found to have much higher CHTC, the turbulence intensity along the cooling pipe could be promoted, which could help increase the heat transfer intensity as well.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Thermal Engineering - Volume 138, 25 June 2018, Pages 133-153
نویسندگان
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