کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7054839 | 1458023 | 2018 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Optimization of thermal performance of multi-nozzle trapezoidal microchannel heat sinks by using nanofluids of Al2O3 and TiO2
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
In this study, a new multi-nozzle trapezoidal microchannel heat sink (MNT-MCHS) was proposed. Five substrate materials, two nanofluids with nanoparticle volume fractions, 0.1%â¯â¤â¯Ïâ¯â¤â¯1%, and channel hydraulic diameters, 157.7â¯Âµmâ¯â¤â¯Dhâ¯â¤â¯248.2â¯Âµm, were numerically examined in detail. In addition, heat fluxes in the range of 100-1450â¯W/cm2 subject to inlet coolant temperature from 15â¯Â°C to 75â¯Â°C were examined in detail. A locally optimal MNT-MCHS was defined, and a novel equation was proposed for predicting the maximum temperature on the locally optimal MNT-MCHS depending on the heat flux, coolant inlet temperature, and the Reynolds number. It was found that at a Reynolds number of 900, the overall thermal resistance of a MNT-MCHS using copper as a substrate material is improved up to 76% as compared to that using stainless steel 304. The locally optimal MNT-MCHS, using TiO2-water nanofluid with Ï=1%, could dissipate a heat flux up to 1450â¯W/cm2 at a Re of 900. A minimum thermal resistance in the present study is improved up to 11.6% and 36.6% in association with those of a multi-nozzle MCHS and a double-layer MCHS, respectively.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 117, February 2018, Pages 787-798
Journal: International Journal of Heat and Mass Transfer - Volume 117, February 2018, Pages 787-798
نویسندگان
Ngoctan Tran, Yaw-Jen Chang, Chi-Chuan Wang,