کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
644673 | 1457129 | 2016 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Heat transfer enhancement of an internal subcooled flow boiling over a hot spot
ترجمه فارسی عنوان
افزایش انتقال گرما یک جریان متقاطع داخلی داخل جوش یک نقطه داغ است
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کلمات کلیدی
جریان جوش زیرآبی، زبری سطح، نانو سیال، مواد سطحی، مینی کانال،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
چکیده انگلیسی
Using nanofluids is one of the most recent techniques for improving the boiling performance. The present paper investigates the impact of fluid velocity, nanoparticles addition, and surface characteristics, such as roughness, material and topography on the subcooled flow boiling, experimentally. An experimental setup consisting of a Plexiglas channel with the cross section of 20âÃâ30âmm2 and the length of 120âcm was used for this propose. A cylindrical heater with a diameter of 12âmm was located at the bottom surface of the channel. The experiments were conducted with four different heaters which were made of brass (with and without mini-grooves), aluminum and copper. The experimental results showed that the surface heat flux increases with an increase in the surface roughness and velocity. However, the impact of velocity on the heat flux is only observed at lower boiling surface temperatures and opposite trend has been seen for the higher boiling surface temperature. The experiments were also conducted for pure water and water-alumina nanofluids with a concentration of 0.1 and 0.25 vol.%. The nanofluid with the concentration of 0.25 vol.% has better heat transfer performance than the other ones. When the surface material was considered, brass showed a better boiling heat transfer performance than that of the copper and aluminum. The effect of mini-channels (grooves) on the performance of the nanofluid subcooled flow boiling showed that these grooves have enhanced the heat transfer significantly.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Thermal Engineering - Volume 99, 25 April 2016, Pages 206-213
Journal: Applied Thermal Engineering - Volume 99, 25 April 2016, Pages 206-213
نویسندگان
Bagher Soleimani, Ali Keshavarz,