کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8067185 1521083 2018 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Development of a new empirical correlation for steam condensation rates in the presence of air outside vertical smooth tube
ترجمه فارسی عنوان
توسعه یک همبستگی تجربی جدید برای نرخ تراکم بخار در حضور هوا در خارج از لوله عمودی صاف
کلمات کلیدی
همبستگی، تراکم بخار، گازهای غیر تصفیه کننده، خنک کردن دیوار،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی مهندسی انرژی و فناوری های برق
چکیده انگلیسی
In the past several decades, experimentalists have proposed a large number of correlations to estimate steam condensation rates in the presence of noncondensable gases within free convection regime. However, these correlations are in different forms, and even express conflicting dependencies of the condensation coefficient on some parameters. This study is to aim at developing a new correlation which can faithfully reflect the complex dependencies of condensation coefficient on pressure, air mass fraction and wall subcooling. Considering that more measured data can certainly help to analyze the relationship between condensation coefficient and these parameters, total 374 sets of experimental data have been obtained. It is found that there is a negative power function relation between condensation coefficient and wall subcooling, and the exponent varies with wall subcooling and total pressure. The new correlation, covering two orders of magnitude in the condensation heat transfer coefficient, is valid for pressure ranging from 0.2 to 0.5 MPa, air mass fraction ranging from 0.1 to 0.8 and wall subcooling ranging from 10 to 70 °C. Finally, we have made comparison with experimental data obtained by other investigators which shows that the new correlation is applicative for not only steam-air condensation but also steam-nitrogen and steam-argon condensation, and it can be extended to larger scope of engineering applications.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Annals of Nuclear Energy - Volume 113, March 2018, Pages 139-146
نویسندگان
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