کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10425887 907072 2016 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A nonlocal Fourier's law and its application to the heat conduction of one-dimensional and two-dimensional thermal lattices
ترجمه فارسی عنوان
یک قانون غیر فضایی فوریه و کاربرد آن برای هدایت حرارتی لبه های حرارتی یک بعدی و دو بعدی
کلمات کلیدی
معادله حرارت، مشبک، قانون فوریه، ترمودینامیک غیر موضعی، قانون گرادیان فوریه، غیرقابل انکاری، معادله نفوذ،
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی (عمومی)
چکیده انگلیسی
This study focuses on heat conduction in unidimensional lattices also known as microstructured rods. The lattice thermal properties can be representative of concentrated thermal interface phases in one-dimensional segmented rods. The exact solution of the linear time-dependent spatial difference equation associated with the lattice problem is presented for some given initial and boundary conditions. This exact solution is compared to the quasicontinuum approximation built by continualization of the lattice equations. A rational-based asymptotic expansion of the pseudo-differential problem leads to an equivalent nonlocal-type Fourier's law. The differential nonlocal Fourier's law is analysed with respect to thermodynamic models available in the literature, such as the Guyer-Krumhansl-type equation. The length scale of the nonlocal heat law is calibrated with respect to the lattice spacing. An error analysis is conducted for quantifying the efficiency of the nonlocal model to capture the lattice evolution problem, as compared to the local model. The propagation of error with the nonlocal model is much slower than that in its local counterpart. A two-dimensional thermal lattice is also considered and approximated by a two-dimensional nonlocal heat problem. It is shown that nonlocal and continualized heat equations both approximate efficiently the two-dimensional thermal lattice response. These extended continuous heat models are shown to be good candidates for approximating the heat transfer behaviour of microstructured rods or membranes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Comptes Rendus Mécanique - Volume 344, Issue 6, June 2016, Pages 388-401
نویسندگان
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