کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7053978 | 1458014 | 2018 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Heat transfer correlations for jet impingement boiling over micro-pin-finned surface
ترجمه فارسی عنوان
همبستگی انتقال حرارت برای جابجایی جت بر روی سطح میکرو پین فین
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
چکیده انگلیسی
Heat transfer performance of submerged jet impingement boiling over staggered micro-pin-finned surfaces was investigated using air-dissolved FC-72. The dimension of the silicon chips is 10â¯Ãâ¯10â¯Ãâ¯0.5â¯mm3 (lengthâ¯Ãâ¯widthâ¯Ãâ¯thickness) on staggered micro-pin-fins with four dimensions of 30â¯Ãâ¯30â¯Ãâ¯60â¯Î¼m3, 50â¯Ãâ¯50â¯Ãâ¯60â¯Î¼m3, 30â¯Ãâ¯30â¯Ãâ¯120â¯Î¼m3 and 50â¯Ãâ¯50â¯Ãâ¯120â¯Î¼m3 (widthâ¯Ãâ¯thicknessâ¯Ãâ¯height, named S-PF30-60, S-PF50-60, S-PF30-120, and S-PF50-120) were fabricated by using the dry etching technique. The effects of micro-pin-fins, jet-to-target distance (Hâ¯=â¯3, 6, and 9â¯mm), and jet Reynolds number (Reâ¯=â¯2853, 5707, and 8560) on jet impingement boiling heat transfer performance were explored. For comparison, experiments with jet impinging on a smooth surface were also conducted. The results showed that all micro-pin-finned surfaces show better heat transfer performance than that of a smooth surface. The largest Nusselt number is 1367, corresponding to a heat transfer coefficient of 26387â¯W·mâ2·Kâ1 with S-PF30-120 at Reâ¯=â¯8560, H/dâ¯=â¯2, and qâ¯=â¯151â¯W·cmâ2, which is approximately twice the largest Nusselt number of Chip S. In the single-phase heat-transfer-dominant region, the Nusselt number (Nu) is mainly influenced by several dimensionless numbers, including Reynolds number (Re), boiling number (Bo), the ratio of jet-to-target distance to jet diameter (H/d), the ratio of micro-pin-finned surface area to smooth surface area A/AS, and a dimensionless number corresponding to flow resistance Dh/Lh. Correlations to predict Nu in both single-phase heat-transfer-dominant region and two-phase heat-transfer-dominant region for smooth and micro-pin-finned surfaces were proposed. The results show that most data (96%) in the single-phase heat-transfer-dominant region and most data (96%) in the two-phase heat-transfer-dominant region were predicted within ±13% and ±15%, respectively. In addition, CHF correlations for smooth and micro-pin-finned surfaces were also proposed, and most data (95%) are predicted within ±20% for a smooth surface and all the data within ±5% for the micro-pin-finned surfaces.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 126, Part A, November 2018, Pages 401-413
Journal: International Journal of Heat and Mass Transfer - Volume 126, Part A, November 2018, Pages 401-413
نویسندگان
Yonghai Zhang, Bin Liu, Jinjia Wei, Bengt Sundén, Zan Wu,