Constructal tree-shaped parallel flow heat exchangers
Constructal tree-shaped parallel flow heat exchangers
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DOI：
10.1016/j.ijheatmasstransfer.2006.04.035
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发表时间：
2006-11
影响因子：
5.2
通讯作者：
V. Zimparov;A. L. D. Silva;A. Bejan
中科院分区：
文献类型：
--
作者：
V. Zimparov;A. L. D. Silva;A. Bejan
本文报道了平衡两流并联换热器的性能，其中每流在其分配的空间内作为树形网络流动。这两棵树是平行流动的，就像两只棕榈树相互压在一起。对于几种平行的树流配置，开发了效率和传热单元数量之间的关系：(i)均匀覆盖矩形区域的构造二分类树，（ii）盘形区域上的树，以及（iii）方形区域上的树。在构型（ii）和（iii）中，每个流都在区域的中心和外围之间流动。配置(i)和（ii）是对流体流动阻力最小的采油树。配置（iii）是通过最小化网络中每个管道的长度来设计的。对平行流配置与逆流配置的性能进行了比较。展望了树枝状换热器在最大传热密度器件中的应用前景。
The paper reports the performance of balanced two-stream parallel flow heat exchangers, in which each stream flows as a tree network through its allotted space. The two trees are in parallel flow, and are arranged like two palms pressed against each other. The relationships between effectiveness and number of heat transfer units are developed for several parallel tree flow configurations: (i) constructal dichotomous trees covering uniformly a rectangular area, (ii) trees on a disk-shaped area, and (iii) trees on a square-shaped area. In configurations (ii) and (iii) each stream flows between the center and the periphery of the area. Configurations (i) and (ii) are trees with minimal resistance to fluid flow. Configuration (iii) is designed by minimizing the length of each duct in the network. The performance of the parallel flow configurations is compared with the performance of counterflow configurations. The future use of dendritic heat exchangers in devices with maximal heat transport density is proposed.