کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7045821 | 1457095 | 2018 | 36 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Experimental study of heat transfer and friction factor inside elliptic tube fixed with helical coils
ترجمه فارسی عنوان
بررسی تجربی انتقال حرارت و عامل اصطکاک در لوله بیضوی ثابت با کویل های حلزونی
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کلمات کلیدی
افزایش انتقال حرارت، لوله بیضوی، کویل حلقه ای، سیم مدور و مستطیلی،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
چکیده انگلیسی
The circular and rectangular helical-coils were sited in elliptic tube section with four various pitches of 20, 45, 135 and 225â¯mm. The cold air Re number was ranged from (11â¯Ãâ¯103â¯â¤â¯Reâ¯â¤â¯3.375â¯Ãâ¯104). The effect of reverse-flow for different pitches and inserted helical wire cross-sections can improve the heat transfer rate. Also, comparing with previous studies, the use of circular and rectangular wire cross-sections inserted in elliptic tube at various helical-coil pitches was useful over the smooth tube, and rectangular cross-section helical-coil is more potent in heat transfer enhancement rather than circular one. Nu, f and η for rectangular helical wire cross-section inserted in elliptic tube are higher than that is for circular one for all values of helical-coil pitches by about 15%, 3% and 14% respectively. η for the current elliptic tube fixed with circular and rectangular helical-coil are higher than that of Sharafeldeen et al. (2017) for all helical-coil pitches by about 24.5% in average. Correlated data results of Nu, f and η for helical-coil with different wire cross-sections are obtained for the considered Re range.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Thermal Engineering - Volume 134, April 2018, Pages 407-418
Journal: Applied Thermal Engineering - Volume 134, April 2018, Pages 407-418
نویسندگان
M.A. Omara, Mohamed A. Abdelatief,