کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4994392 | 1458033 | 2017 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Experimental and numerical investigation on heat transfer characteristics of supercritical CO2 in the cooled helically coiled tube
ترجمه فارسی عنوان
بررسی تجربی و عددی ویژگی های انتقال گرما از گازهای فوق بحرانی در لوله های حلقه ای خنک شده
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
چکیده انگلیسی
The heat transfer characteristics of supercritical CO2 cooled in the helically coiled tube are investigated experimentally and numerically. The inner diameter, coil pitch and coil radius of the helically coiled tube are 4Â mm, 34Â mm and 36Â mm, respectively. The effects of heat flux, pressure and mass flux on the heat transfer are analyzed based on 512 sets of experimental data, a new modified correlation is developed to calculate the heat transfer coefficients of supercritical CO2 in the cooled helically coiled tube. To study the buoyancy effect, the heat transfer coefficients of upward flow are compared to that for horizontal flow, and it is found that the effect of buoyancy is negligible in the liquid-like region, but significant in other region under the experimental conditions. On this basis, the three buoyancy parameters: Bup, Grth/Grq and Ri are applied to predict the effect of buoyancy on the heat transfer. The three parameters overestimate the impact of buoyancy. Numerical analysis of the cooling heat transfer coefficient in helically coiled tube is conducted by using shear-stress transport (SST) model. The flow fields are analyzed and the effect of heat flux is mainly related to the distribution of specific heat (cp) in the radial direction of tube transverse section.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 108, Part B, May 2017, Pages 1645-1655
Journal: International Journal of Heat and Mass Transfer - Volume 108, Part B, May 2017, Pages 1645-1655
نویسندگان
Kai-Zheng Wang, Xiao-Xiao Xu, Chao Liu, Wan-Jin Bai, Chao-bin Dang,