کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
668032 1458727 2015 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Numerical simulation of natural convection between hot and cold microtubes in a cylinder enclosure
ترجمه فارسی عنوان
شبیه سازی عددی توالی طبیعی بین میکرو تیوب های گرم و سرد در محفظه سیلندر
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی


• Natural convection of two horizontally aligned hot and cold tubes in an adiabatic cylindrical enclosure was studied.
• The effect of tube position on heat transfer was emphasized by simulating the natural convection between the two tubes.
• The local and total averaged Nusselt numbers for both tubes were obtained.
• A correlation of the total averaged Nusselt number with the Rayleigh number and the inclination angle was simulated.

Natural convection around a pair of hot and cold microtubes parallelized horizontally in an adiabatic cylindrical enclosure was numerically simulated, using a hybrid Lattice-Boltzmann Finite-Difference Method (LBFDM), coupled with Direct Forcing (DF) technique. The sharp interface DF scheme was used for the curve boundaries of both the microtubes and the cylindrical enclosure. The computation code was validated by using a case of natural convection in an eccentric annulus, and a similar previous study using large Rayleigh numbers. In addition to flow patterns and temperature profiles around those microtubes, a correlation between the Nusselt number (Nu) and the Rayleigh number (Ra) and their relative position was proposed in the form of Nu = f (Ra, Pr, θ). The results indicate that the effective heat transfer coefficient between the micro-tubes is the smallest when hot tube is placed directly over the cold one, and the maximum can be achieved with the cold tube above the hot tube, but with the inclination angle 60° from the upward direction when Ra < 1400.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Thermal Sciences - Volume 95, September 2015, Pages 115–122
نویسندگان
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