کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
652831 1457477 2016 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A new method of adjustment of inlet boundary for improving heat transfer of mixed convection in a vertical channel
ترجمه فارسی عنوان
روش جدید تنظیم مرزی ورودی برای بهبود انتقال حرارت همرفت مخلوط در یک کانال عمودی
کلمات کلیدی
جریان قابل تراکم. مرز غیرمنعکس ؛ همرفت مخلوط
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی

This article is dedicated to a new method for improving heat transfer of mixed convection in a vertical channel from the numerical perspective. An adjustable inlet boundary is proposed in the new method to substitute an inlet that is completely occupied by the amount of fluid provided by forced convection included in mixed convection. According to this new method, the flow reversal occurring in the large Richardson number situation can be eliminated significantly, which results in an improvement in the heat transfer rate of mixed convection. In order to investigate a compressible flow problem, this study focuses on four methods, i.e., Roe scheme, preconditioning, dual time stepping, and the LUSGS (Lower–Upper Symmetric-Gauss–Seidel), to solve the governing equations. Except for the aperture occupied by the mount of fluid provided by forced convection, this study simulates the non-reflecting boundary conditions in other open boundaries. Based on our previous study which has successfully explored a phenomenon of flow reversal, this study intends to enhance the heat transfer rate under this circumstance, and the result has shown a significant improvement, by 29 percentage, comparing with the previous study. Also, a criterion of estimation of the necessity of forced convection included in mixed convection is proposed for enhancing heat transfer rate. Present results and existing results have good agreement.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Communications in Heat and Mass Transfer - Volume 77, October 2016, Pages 165–173
نویسندگان
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