کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7053910 1458013 2018 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Microfluidic effects on the heat transfer enhancement and optimal design of microchannels heat sinks
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Microfluidic effects on the heat transfer enhancement and optimal design of microchannels heat sinks
چکیده انگلیسی
Due to the rapid progress in miniaturization and utilization of low-dimensional structures, the optimal design of microchannel heat sinks has received a great deal of attention. However, the concept of 'micro' has been solely used as a word and therefore, microchannels are normally modeled just like the (macro-scale) channels. The aim of this article is to provide an optimal geometric structure of a micro-scale channel heat sink, by assuming slip boundary condition, instead of no-slip boundary condition which breaks down in the rigid walls of a low-dimensional microchannel or a channel. The optimization objective is to reduce the maximum temperature of the system (or to minimize the thermal resistance) so that the pressure drop in the channel is kept to a desirable level. Three-dimensional fluid flow and heat transfer phenomena inside the microchannel heat sink are investigated numerically. To reveal the effects of velocity slip on the optimal design of a microchannel heat sink, the optimization results (optimal geometric parameters and the minimal thermal resistance) assuming slip boundary condition are compared with the optimization results assuming no-slip condition. Compared with the case of no-slip boundary condition, it is indicated that the slippage reduces the minimum thermal resistance drastically and changes the geometric design points such as the optimal number and the optimal aspect ratio of the microchannels. For example, it is shown that the aspect ratio of the microchannel is enlarged and the microchannel tends to be narrow when the slip parameter increases.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 126, Part B, November 2018, Pages 808-815
نویسندگان
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