کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
658855 | 1458124 | 2010 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Geometric effect of radiative heat exchange in concave structure with application to heating of steel I-sections in fire
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
In structural fire engineering, it is well-known that the radiative heat exchange in unprotected steel I-section is attenuated due to geometric effect. An analytical approach to formulate the geometric effect by employing view factors is presented in this paper for concave structures in general. In particular, the exact solution is extended to predict the net radiation flux and the temperature evolution for unprotected steel I-sections in fire, which are fully characterized by the I-section aspect (width-to-depth) ratio. The proposed method is validated by comparison to the conventional model in Eurocode 3, as well as to experimental investigations. The method predicts the transient temperature field inside the I-sections with reasonable accuracy, while Eurocode provision yields over-estimations. Besides, the effective emissivity is found to be insensitive to temperature, but rather controlled by the section aspect ratio.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 53, Issues 5â6, February 2010, Pages 997-1003
Journal: International Journal of Heat and Mass Transfer - Volume 53, Issues 5â6, February 2010, Pages 997-1003
نویسندگان
Zhi-Hua Wang,