کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7915906 | 1511034 | 2016 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Experimental investigation on chill-down process of cryogenic flow line
ترجمه فارسی عنوان
تحقیقات تجربی در مورد روند خنک کننده جریان خط فریزر
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
نیتروژن مایع، چلچراغ، لوله افقی جریان جوش، شار گرمای انتقالی، حداقل شار گرما،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
چکیده انگلیسی
This paper describes the cryogenic chill-down experiments that are conducted on a 12.7Â mm outer diameter, 1.25Â mm wall thickness and 7Â m long stainless steel horizontal pipe with liquid nitrogen (LN2). The pipe is vacuum insulated during the experiment to minimize the heat leak from room temperature and to enable one to numerically simulate the process easily. The temperature and the pressure profiles of the chill-down line are obtained at the location which is 5.5Â m in a distance from the pipe inlet. The mass flux range is approximately from 19Â kg/m2Â s to 49Â kg/m2Â s, which corresponds to the Reynolds numbers range from 1469 to 5240. The transient histories of temperature, pressure and mass flow rate during the line chill-down process are monitored, and the heat transfer coefficient and the heat flux are computed by an inverse problem solving method. The amplitude of the pressure oscillation and the oscillating period become larger and longer at higher pressure conditions. In the low mass flux conditions, the critical heat flux in horizontal pipes is not sensitive to mass flux, and is higher than that in vertical pipes. Kutateladze's correlation with the constant coefficient, B=0.029, well matches the experimental data in the current work. In nucleate flow boiling regime, heat transfer coefficient, h, is proportional to (qâ³)n, and n is equal to 0.7.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Cryogenics - Volume 79, October 2016, Pages 96-105
Journal: Cryogenics - Volume 79, October 2016, Pages 96-105
نویسندگان
Lingxue Jin, Changgi Park, Hyokjin Cho, Cheonkyu Lee, Sangkwon Jeong,