کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7059471 1458088 2012 21 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Numerical study of flow and heat transfer characteristics in outward convex corrugated tubes
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Numerical study of flow and heat transfer characteristics in outward convex corrugated tubes
چکیده انگلیسی
The flow and heat transfer characteristics in convex corrugated tubes have been investigated through numerical simulations in this paper. Two kinds of tube types named as symmetric corrugated tube (SCT) and asymmetric corrugated tube (ACT) are modeled and studied numerically based on the k-ε model. The heat transfer working fluid at shell and tube sides are nitrogen and helium gases respectively. 2D axisymmetric model is adopted to simplify 3D model in order to reduce the computation cost greatly. Numerical simulation results for flow and heat transfer performances in SCT and ACT with various geometrical parameters, including corrugation pitch, corrugation height and corrugation trough radii are systematically analyzed. The mechanisms behind the improvement of overall performances of the simulated outward convex corrugated tube are discussed through investigating the details of turbulent velocity fields at both tube and shell sides. Compared to SCT, ACT exhibits 8-18% higher overall heat transfer performance.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 55, Issues 25–26, December 2012, Pages 7782-7802
نویسندگان
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