带分段波纹图案的板式热交换器实验

0 ENGINEERING, MECHANICAL
Matheus Strobel, L. Beckedorff, Giovani Martins, J. Oliveira, K. Paiva
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引用次数: 0

摘要

垫片板式热交换器(GPHE)是最常用的热交换器类型之一,以其高效和紧凑的设计而著称。其显著特点是波纹板的几何形状,通常为雪佛龙图案。本研究旨在分析另一种波纹模式,即与垂直方向不同角度的分段。由于对这种模式的研究很少,分段板的优缺点尚不清楚。为了填补这一空白,我们通过实验评估了由 31 块分段板组成的 GPHE 的压降和传热情况。板有四个象限,低角度板和高角度板的组合可形成多达六种通道类型。在 144 组实验中获得了压力和温度数据。在压降结果中,我们观察到两股气流之间存在相当大的差异,由此引出了一个相关现象的讨论:板的弹性变形。如果两股水流的内部压力不相等,压力梯度会导致板变形并改变通道的几何形状。压力较高的水流会使其通道扩张,而压力较低的通道则会被勒住。这种现象在文献中很少报道,但对压降影响很大。此外,我们还利用流量数据给出了六种水道类型的摩擦因数相关性。根据传热实验中的广义 Lévêque 类比,我们认为板的变形也会影响传热。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Experiments On Gasketed Plate Heat Exchangers with Segmented Corrugation Pattern
Gasket plate heat exchanger (GPHE) is among the most used heat exchanger types, known for its high effectiveness and compact design. Its remarkable feature is the corrugated plate geometry, typically a Chevron pattern. This work aims to analyze another corrugation pattern, which has segments with different angles to the vertical. The strengths and weaknesses of the segmented plate are still unclear, as the studies on this pattern are scarce. To fill this gap, we experimentally assess the pressure drop and heat transfer in a GPHE composed of 31 segmented plates. The plates have four quadrants, and the combination of low-angle and high-angle plates can form up to six channel types. Pressure and temperature data are acquired in 144 sets of experiments. In the pressure drop results, we observe a considerable discrepancy between the two streams, which leads to a discussion of a relevant phenomenon: the elastic deformation of the plates. If the inner pressure of the streams is not equal, the pressure gradient causes the plates to deform and change the channel geometry. The stream with the higher pressure has its channels expanded, while the lower pressure channels will be strangled. This phenomenon is rarely reported in the literature and strongly affects the pressure drop. Moreover, we present friction factor correlations for six channel types using flow data. Based on the generalized Lévêque analogy in the heat transfer experiments, we argue that the plates' deformation also affects the heat transfer.
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