کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7045294 | 1457091 | 2018 | 18 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Heat transfer and flow characteristics of impinging jet on a concave surface at small nozzle to surface distances
ترجمه فارسی عنوان
ویژگی های انتقال حرارت و جریان جت مجهز به سطح مقعر در نازل کوچک تا مسافت های سطح
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
چکیده انگلیسی
Experimental and numerical investigations were carried out to analyze the flow and heat transfer characteristics of an impinging jet on a concave surface at small jet-to-surface distances. Constant heat flux of 2000â¯W/m2 is applied on the concave surface using a silicon rubber heater mat. In the steady-state condition, the temperature distribution of the concave surface is measured with an infrared camera. In the experimental study, a jet with 24â¯mm diameter and cylindrical surface with the curvature radius of 12â¯cm (Crâ¯=â¯0.1) has been considered. The study of flow and heat transfer characteristics have been performed for different jet Reynolds numbers (10,000-35,000) and various nozzle diameters (18-30â¯mm). The distributions of velocity and Nusselt number for small jet-to-surface distances (H/Dâ¯<â¯1.0) have been compared with large jet-to-surface distances (H/Dâ¯â¥â¯1.0). Comparisons between numerical results and experimental data confirm that the numerical predictions performed by SST k-Ï model fairly predict the velocity and Nusselt number distributions. Experimental and numerical results confirm that the jets with small nozzle-to-surface distances (H/Dâ¯=â¯0.1, 0.2 and 0.4) provide a much more Nusselt number distributions in comparison with the surfaces with the large nozzle-to-surface distances (H/Dâ¯=â¯1.0, 2.0 and 4.0). The correlated equations of the averaged Nusselt number reveal that the Nuâ¾ is related to (H/D)-0.54 and (H/D)-0.14 for small (H/Dâ¯<â¯1.0) and large (H/Dâ¯>â¯1.0) jet-to-surface distances respectively.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Thermal Engineering - Volume 138, 25 June 2018, Pages 534-541
Journal: Applied Thermal Engineering - Volume 138, 25 June 2018, Pages 534-541
نویسندگان
Amirhosein Hadipour, Mehran Rajabi Zargarabadi,