Tree-shaped networks with loops
Tree-shaped networks with loops
复制标题
DOI：
10.1016/j.ijheatmasstransfer.2004.08.020
复制
发表时间：
2005-01-01
影响因子：
5.2
通讯作者：
Bejan, A
中科院分区：
文献类型：
--
作者：
Wechsatol, W;Lorente, S;Bejan, A
树枝状流结构被考虑用于热设计，其为电子设备的冷却提供高的传热密度。优化的树状网络最大化一个点（源，汇）和无限多个点（线，区域，体积）之间的流量访问。本文是一类新的树枝状流结构的热设计的基础研究：树与闭环结构相结合。就像树叶的脉络一样回路为设计提供了鲁棒性：即使一个或多个风管损坏，管网也会继续为其指定区域提供服务。该研究记录了系统的性能和鲁棒性的实现，从最简单的体系结构开始，并继续向更复杂的，即，一个循环大小和两个循环大小的点-圆网络。以及具有无分支和有分支水平的环路的网络。结果表明，使用循环增加了全球流动阻力相对于树枝状设计没有循环。管道损坏或从管网中移除。也导致整体流动阻力的增加。如果网络得到优化，随着复杂性的增加，这些影响变得不那么重要。受损的外围管道比位于网络中心附近的受损管道引起更小的惩罚。总之，优化的复杂流结构是稳健的。环是一个有吸引力的设计特征，用于在结构经历局部损伤时保持高水平的整体性能。(C)2004爱思唯尔有限公司保留所有权利。
Dendritic flow architectures are being contemplated for thermal designs that provide high heat transfer densities for the cooling of electronics. Optimized tree networks maximize the flow access between one point (source, sink) and an infinity of points (line, area, volume). This paper is a fundamental study of a new class of dendritic flow architectures for thermal design: trees combined with closed-loop structures. as in the venation of leaves. The loops provide robustness to the design: the network continues to serve its assigned area even if one or more ducts are damaged. The study documents the achievement of performance and robustness systematically, by starting from the simplest architectures and proceeding toward the more complex, namely, point-circle networks with one loop size and two loop sizes. and networks with loops without and with branching levels. It is shown that the use of loops increases the global flow resistance relative to the dendritic design without loops. Damage, or removal of a duct from the network. also leads to an increase in global flow resistance. These effects become less important as complexity increases, provided that the network is optimized. A damaged peripheral duct induces a smaller penalty than a damaged duct that is situated close to the center of the network. In summary, optimized complex flow structures are robust. Loops are an attractive design feature for maintaining a high level of global performance when the structure experiences local damage. (C) 2004 Elsevier Ltd. All rights reserved.