کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
657338 1458060 2015 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Study on thermal resistance distribution and local heat transfer enhancement method for SCO2–water heat exchange process near pseudo-critical temperature
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Study on thermal resistance distribution and local heat transfer enhancement method for SCO2–water heat exchange process near pseudo-critical temperature
چکیده انگلیسی

In this article, a coupled heat transfer between supercritical carbon dioxide (SCO2) and water in a concentric tube heat exchanger is numerically studied. It is found that unlike air–water heat exchange process, the distribution of local thermal resistance in the concentric tube heat exchanger strongly depends on the inlet velocity of SCO2 and water when the temperature of SCO2 is near the pseudo-critical point. Based on the distribution of local thermal resistance, a new local heat transfer enhancement method is proposed to enhance the weakest region for the SCO2–water heat exchange under different operating conditions. Further, the obtained numerical results confirm that the local heat transfer enhancement method can significantly improve the comprehensive heat transfer performance of heat exchanger. Compared to smooth tube heat exchanger, the local heat transfer enhancement method of heat exchanger with half-length sinusoidal corrugated surface can enhance the heat transfer by 15.8% compensated with 5.9% more pressure drop when the velocity of SCO2 is comparable with that of water.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 82, March 2015, Pages 179–188
نویسندگان
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