کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
653710 | 885212 | 2012 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Local heat transfer characteristics of array impinging jets from elongated orifices
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The aim of this research is to enhance the heat transfer on an impinged surface under an impinging jet array by minimizing a cross-flow effect. Conventional round orifices (aspect ratio, ARÂ =Â 1) are substituted by the elongated orifices with aspect ratio ARÂ =Â 4 and 8 with the same jet exit area. Two types of orifice arrangements; in-line and staggered arrays are compared. The experimental investigation was carried out at constant distance from orifice plate to impinged surface HÂ =Â 2DE (DE is equivalent diameter of orifice). The heat transfer characteristic was visualized using thermochromic liquid crystal sheet (TLCs) and the Nusselt number distribution was evaluated by an image processing technique. The flow characteristic on the impinged surface was also visualized by oil film technique. The results show that the cross-flow in a case of the jets issued from the orifices with ARÂ =Â 4 is considerably less significant than that in cases of the ones delivered from the orifices with ARÂ =Â 1 and 8. At Reynolds number of 13,400, the Nusselt numbers for the jet arrays issued from the elongated orifices with ARÂ =Â 4 with in-line and staggered arrangements are respectively 6.04% and 12.52% higher than those for the case of ARÂ =Â 1.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Communications in Heat and Mass Transfer - Volume 39, Issue 8, October 2012, Pages 1154-1164
Journal: International Communications in Heat and Mass Transfer - Volume 39, Issue 8, October 2012, Pages 1154-1164
نویسندگان
C. Nuntadusit, M. Wae-hayee, P. Tekasakul, S. Eiamsa-ard,