کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
661606 | 1458136 | 2009 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Flow visualizations and heat transfer measurements for a rotating pin-fin heat sink with a circular impinging jet
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Flow visualizations and heat transfer measurements for a rotating pin-fin heat sink with a circular impinging jet Flow visualizations and heat transfer measurements for a rotating pin-fin heat sink with a circular impinging jet](/preview/png/661606.png)
چکیده انگلیسی
This work experimentally investigated the fluid flow and heat transfer behaviors of jet impingement onto the rotating heat sink. Air was used as impinging coolant, while the square heat sinks with uniformly in-line arranged 5 Ã 5 and 9 Ã 9 pin-fins were employed. The side length (L) of the heat sink equaled 60 mm and was fixed. Variable parameters were the relative length of the heat sink (L/d = 2.222 and 4.615), the relative distance of nozzle-to-fin tip (C/d = 0-11), the jet Reynolds number (Re = 5019-25,096) and the rotational Reynolds number (Rer = 0-8114). Both flow characteristics of stationary and rotating systems were illustrated by the smoke visualization. Besides, the results of heat transfer indicate that, for a stationary system with a given air flow rate, there was a larger average Nusselt number (Nu0) for the 9 Ã 9 pin-fin heat sink with L/d = 4.615 and C/d = 11. For a rotating system, a bigger Rer meant a more obvious heat transfer enhancement (NuΩ/Nu0) in the case of smaller Re, but NuΩ/Nu0 decreased with increasing Re. In this work, NuΩ/Nu0 in L/d = 2.222 is higher than in L/d = 4.615; among the systems in L/d = 2.222, bigger NuΩ/Nu0 exists in the case of C/d = 9-11, but among the systems in L/d = 4.615, bigger NuΩ/Nu0 exists in the case of C/d = 1-3. Finally, according to the base of NuΩ/Nu0 ⩾ 1.1, the criterion of the substantial rotation was suggested to be Rer/Re ⩾ 1.154.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 52, Issues 7â8, March 2009, Pages 2119-2131
Journal: International Journal of Heat and Mass Transfer - Volume 52, Issues 7â8, March 2009, Pages 2119-2131
نویسندگان
Tzer-Ming Jeng, Sheng-Chung Tzeng, Hong-Ru Liao,