کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
11003449 | 1458689 | 2018 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Experimental thermal and flow characteristics in a traverse corrugated tube fitted with regularly spaced modified wire coils
ترجمه فارسی عنوان
خصوصیات حرارتی و جریان تجربی در یک لوله ورقه ورقه ای که دارای سیمهای اصلاح شده به طور منظم است
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کلمات کلیدی
کویل های سیمان اصلاح شده به طور منظم، افزایش انتقال حرارت، جریان سیالات، عملکرد حرارتی به طور کلی، نسل آنتروپی،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
چکیده انگلیسی
The work presents experimental investigations on turbulent thermal and flow characteristics in a traverse corrugated tube (TCT) fitted with regularly spaced wire coils with gradually varying width (WCs-GVW). The experiments were performed in the TCT with WCs-GVW having constant heat flux conditions at Reâ¯=â¯6000 to 18000 by using air as working fluid. The goal motivated by this compound heat transfer enhancement technology was to induce transverse vortices by ribs and to generate swirl flows by WCs, aimed to impart flow separation and reattachment and flow mixing, and hence improvement in heat transfer. Three arrangements including the diverging arrangement of WCs (DWC), the converging arrangement of WCs (CWC) and the diverging and converging arrangement of WCs (DCWC) and five space ratios at S/Dâ¯=â¯0.60, 1.55, 2.97, 5.34 and 10.09 were considered. Effects of those parameters on Nusselt number (Nu), friction factor (f), performance evaluation criterion (PEC), Bejan number (Be) and augmented entropy generation number (Ïs) were analyzed. The main findings are that the CWC arrangement possesses the lowest PEC and the Nu and f in the DWC arrangement increase with decreasing the space ratio. In contrast to the plain tube, the Nu in the TCT with WCs-GVW increases nearly 1.74 to 2.26 times while the f is in a range of about 4.18-10.68 times. The obtained results show that the maximum PEC of about 1.13 is achieved by the WCs-GVW with DWC arrangement at S/Dâ¯=â¯10.09 and Reâ¯=â¯14102. However, all compound ones exhibit lower PEC values than the alone use of the TCT. In addition, it is found that the Be in the baseline of the plain tube is decreased via the employment of the alone TCT or co-use of the TCT and WCs-GVW, nevertheless, the total entropy production is dominated by the entropy production due to heat transfer under considered parameters. The Ïs in the plain tube is reduced to be less than unity by using the enhanced devices indicates the thermodynamic advantage of those TCT and TCT/WCs-GVW, and the lowest Ïs of about 0.5 is gained by utilizing the WCs-GVW with DWC arrangement at S/Dâ¯=â¯0.60 and Reâ¯=â¯6517. At last, the empirical formulas of the investigated TCT and TCT/WCs-GVW in terms of Nu and f are proposed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Thermal Sciences - Volume 133, November 2018, Pages 330-340
Journal: International Journal of Thermal Sciences - Volume 133, November 2018, Pages 330-340
نویسندگان
Juan Du, Yuxiang Hong, Shuangfeng Wang, Wei-Biao Ye, Si-Min Huang,