کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9690301 | 1457224 | 2005 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Non-adiabatic capillary tube flow of carbon dioxide in a novel refrigeration cycle
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Non-adiabatic capillary tube flow of carbon dioxide in a novel refrigeration cycle Non-adiabatic capillary tube flow of carbon dioxide in a novel refrigeration cycle](/preview/png/9690301.png)
چکیده انگلیسی
This paper presents a non-adiabatic homogeneous model of carbon dioxide flow through a capillary tube, where the carbon dioxide undergoes a phase change from supercritical fluid flow to subcritical two-phase flow. The model is based on the fundamental conservation equations of mass, momentum and energy. These equations are solved simultaneously through iterations. The in-tube flow can be divided into a single-phase region and a two-phase region. The extreme choked situation at the outlet is evaluated by local sonic velocity judgment. Relationships between cooling pressure, evaporating temperature, ambient heat transfer coefficient, capillary size, and other parameters are presented and analyzed in detail. It can be seen that the heat transfer rates change with different kinds of capillary tubes under different conditions, and fall into the range of about 50-550 W with Q0 = 7 kW, t3 = 45 °C, t0 = 0 °C, di = 1.85 mm, ε = 0.0015 mm, and α0 = 400 W/(m2 K). The present model can be used for both system design and performance evaluation, it is also very helpful in understanding the supercritical flow behavior inside capillary.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Thermal Engineering - Volume 25, Issues 11â12, August 2005, Pages 1670-1683
Journal: Applied Thermal Engineering - Volume 25, Issues 11â12, August 2005, Pages 1670-1683
نویسندگان
Y. Chen, J. Gu,