کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4995166 | 1458701 | 2017 | 17 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Heat transfer enhancement in a cross-slot micro-geometry
ترجمه فارسی عنوان
افزایش انتقال حرارت در یک میکرو هندسه متقاطع
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
صلیب اسلات، میکرو هندسه، انتقال گرما، تقارن پایدار تقسیم، گرداب اسپیرال، هیسترزیس،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
چکیده انگلیسی
The cross-slot is a common geometric shape in microfluidic applications. In this article we investigate the influence of a purely-inertial flow instability on the enhancement of heat transfer in a cross-slot micro-geometry where symmetry is broken but the flow remains steady. The cross-slot comprises two crossed square channels with opposed inlets and outlets, which generate a stagnation point at the geometric centre (when the flow remains stable and symmetric). In the experiments, Rhodamine-B is utilised as a temperature-sensitive dye to measure the temperature distribution, these results compare well with three-dimensional numerical simulations, which are used to further elucidate the flow behaviour and heat transfer characteristics. The flow of a Newtonian fluid is steady, two-dimensional and produces a sharp symmetric boundary between fluid streams entering the cross-slot from opposite directions at low Reynolds numbers (Re). Therefore, only conduction heat transfer occurs between the fluid streams as there is virtually no mixing between them. Beyond a certain critical value of Re, approximately 40, a steady symmetry-breaking bifurcation occurs and convective heat transfer arises because an axially oriented spiral vortex is created in the outlet arms. The effects of this purely-inertial instability suggest it is an effective method of enhancing mixing and heat transfer in microfluidic devices that can be exploited in applications such as lab-on-chip and micro chemical-reaction devices at relatively low Reynolds numbers (i.e. Re < 100).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Thermal Sciences - Volume 121, November 2017, Pages 249-265
Journal: International Journal of Thermal Sciences - Volume 121, November 2017, Pages 249-265
نویسندگان
Waleed M. Abed, Allysson F. Domingues, Robert J. Poole, David J.C. Dennis,