Thermally Developing Forced Convection and Heat Transfer in Rectangular Plate-Fin Passages Under Uniform Plate Temperature
Thermally Developing Forced Convection and Heat Transfer in Rectangular Plate-Fin Passages Under Uniform Plate Temperature
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DOI：
10.1080/10407780701303658
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发表时间：
2007-07
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影响因子：
--
通讯作者：
Li-Zhi Zhang
中科院分区：
文献类型：
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作者：
Li-Zhi Zhang
板翅通道内的层流强迫对流是低雷诺数换热器设计的重要内容。不同宽高比的矩形截面管内的热发展、流体动力发展的强制对流传热已经在各种书籍中得到了很好的研究和记录，但对于板翅管却没有做太多的工作。典型的板-鳍通道由两个水平板和两个垂直鳍组成。本研究的主要假设是板在均匀温度条件下，两个翅片上的热流以偏对称的方式分布。将翅片内的热传导和流体中的对流作为一个共轭问题同时进行分析。考虑了从0.125到4.0的各种管道宽高比，并且翅片具有从0到无限大的不同电导参数，代表从聚合物到纯铜的材料。得到了发展区的Nusselt数、热进入长度和这些通道的完全展开值，可用于估算具有不同导热系数和厚度的板-翅片紧凑式换热器的传热性能。
Laminar forced convection inside plate-fin passages is of interest in the design of a low-Reynolds-number heat exchanger apparatus. Heat transfer to thermally developing, hydrodynamically developed forced convection inside tubes of rectangular cross section with various aspect ratios has been well studied and documented in various books, but for plate-fin ducts there has not been much work done. A typical plate-fin passage is comprised of two horizontal plates and two vertical fins. The main assumption in this study is that the plate is under uniform temperature conditions and the heat fluxes on two fins are distributed in a skew-symmetric manner. Heat conduction in the fin and convection in the fluid are analyzed simultaneously as a conjugate problem. Various duct aspect ratios from 0.125 to 4.0 are considered, and the fins have different conductance parameters from 0 to infinitely large, representing materials from polymers to pure copper. The Nusselt numbers in the developing region, the thermal entry length, and the fully developed values for these passages are obtained, which can be used in estimation of heat transfer performance in plate-fin compact heat exchangers with fins of various thermal conductivities and thicknesses.