کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4995364 | 1458708 | 2017 | 17 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of included angle on turbulent flow and heat transfer in rhombic serpentine heat exchangers
ترجمه فارسی عنوان
اثر زاویه شامل جریان آشفته و انتقال گرما در مبدلهای حرارتی مارپیچی رامبنی
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کلمات کلیدی
مبدل حرارتی سرپانت، کانال رمبوس انتقال گرما، زاویه شامل، چرخش
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
چکیده انگلیسی
Numerical studies of included angle effect on turbulent flow and heat transfer in rhombic serpentine heat exchangers are presented for the first time. Five included angles (γ) are examined, i.e. γ = 45-deg, 60-deg, 90-deg, 120-deg, and 135-deg, with rotation numbers (Ro) and coolant-to-wall density ratios (ÎÏ/Ï) ranging from 0 to 0.2 and 0.1 to 0.2, respectively, at a constant Reynolds number (Re) of 10,000. The Reynolds-averaged Navier-Stokes (RANS) equations with low-Re realizable k-ε model and enhanced wall treatment are solved with the tradeoff between accuracy and computational cost. Code validations are performed through the comparisons with previous measured local Nusselt number ratio (Nu/Nuâ) and thermal performance factor (TPF) for both stationary and rotating channels. The results show that the value of γ significantly affects the flow fields and heat transfer behaviors in both stationary and rotating cases. In the stationary situation, the Nu/Nuâ distributions on leading and trailing walls of the channels with slant walls (γ â 90-deg) are asymmetric. As the channel rotates, there exists a critical rotating number, Roc, in between Ro = 0.1 and 0.2. Beyond Roc, f/f0 decreases with increasing γ. The friction reduction of 135-deg channel to 90-deg channel for Ro = 0.2 and ÎÏ/Ï = 0.1 is about 43%. Furthermore, above Roc and a critical ÎÏ/Ï around 0.2, the TPF increases with increasing γ, resulting in a 6% TPF augmentation when comparing the 135-deg channel with the 90-deg one.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Thermal Sciences - Volume 114, April 2017, Pages 155-171
Journal: International Journal of Thermal Sciences - Volume 114, April 2017, Pages 155-171
نویسندگان
Tong-Miin Liou, Chun-Sheng Wang, Shu-Po Chan,