کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
670080 | 1458773 | 2011 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Numerical investigation of counter flow microchannel heat exchanger with slip flow heat transfer
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Numerical investigation of counter flow microchannel heat exchanger with slip flow heat transfer Numerical investigation of counter flow microchannel heat exchanger with slip flow heat transfer](/preview/png/670080.png)
چکیده انگلیسی
The rectangular microchannel heat exchanger performance is numerically investigated in this paper. Hydrodynamic and heat transfer characteristics in a laminar, 3-D, incompressible, slip flow, steady state and counter flow are proposed. The Navier-Stokes equations and energy equation for the hot and cold fluids are solved with the slip velocity and temperature jump conditions. The governing equations are discretized using finite-volume method-upwind differencing scheme, and then these are solved using SIMPLE algorithm method on staggered grid with FORTRAN code. From the obtained results it was found that the factors affecting the effectiveness are: Reynolds number Re, thermal conductivity ratio Kr, Knudsen number Kn and aspect ratio α. Increasing of Re, Kn and α separately lead to decrease the effectiveness. While the effectiveness increases with increasing Kr until it reach a certain optimal value which gives the maximum effectiveness at Kr = 90. Also, it is found that Nusselt number decrease with increases Knudsen number. Increasing of Re and Kn separately lead to increase pressure drop.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Thermal Sciences - Volume 50, Issue 11, November 2011, Pages 2132-2140
Journal: International Journal of Thermal Sciences - Volume 50, Issue 11, November 2011, Pages 2132-2140
نویسندگان
Ahmed M. Shakir, Ahmed K. Mohammed, Mushtaq I. Hasan,