Numerical studies on thermal hydraulic performance of zigzag-type printed circuit heat exchanger with inserted straight channels
Numerical studies on thermal hydraulic performance of zigzag-type printed circuit heat exchanger with inserted straight channels
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DOI：
10.1016/j.applthermaleng.2017.05.198
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发表时间：
2017-08
影响因子：
6.4
通讯作者：
Seung Yeob Lee;B. G. Park;J. Chung
中科院分区：
文献类型：
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作者：
Seung Yeob Lee;B. G. Park;J. Chung
印刷电路热交换器（PCHE）可以包括许多通道类型之一，如之字形和波浪通道。在这些通道中，由于其高耐用性和可制造性，锯齿形通道是常规型PCHE中最常用的通道；然而，由于流动分离和弯曲处的逆流，之字形通道具有较高的压力损失。为了提高之字形PCHE的性能，提出了一种插入直通道的新型PCHE。利用CFD ANSYS-CFX软件对插入直通道的之字形PCHE的热工性能进行了三维数值分析。从质量流率的角度揭示了插入直通道对传热和压降的影响。插入的直通道长度在0.5到2mm之间变化，质量流量为1.41 × 10−4至2.48 × 10−4kg/s。0.5 mm和1mm直线型通道的压降小于之字形通道，与波浪形通道的压降相似。在换热特性方面，结果表明：0.5 mm和1 mm直线型通道的换热特性与之字形通道非常相似，但优于波浪形通道；在1 mm直道的情况下，体积优度因子的值比原来的锯齿形通道提高了约26-28%。
The printed circuit heat exchanger (PCHE) can include one of many channel types, such as zigzag and wavy channels. Among these channels, the zigzag channel is the most frequently used regarding the conventional-type PCHE due to its high durability and manufacturability; however, the zigzag channel has a high pressure loss due to the flow separation and the reverse flow at the bending point. To improve the performance of the zigzag-type PCHE, a new type of PCHE with inserted straight channels is suggested. A three-dimensional numerical analysis using CFD ANSYS-CFX code is conducted with respect to the thermal-hydraulic performance of a zigzag-type PCHE with inserted straight channels. The effects of the inserted straight channels on the heat transfer and the pressure drop in terms of the mass-flow rate are revealed. The lengths of the inserted straight channels vary between 0.5 and 2 mm, and the mass-flow rate is applied from 1.41 × 10−4to 2.48 × 10−4kg/s. The pressure drops of the 0.5 mm and 1 mm straight channels are less than that of the zigzag channel, and are similar to that of the wavy channel. In terms of the heat transfer characteristics, the results show that the heat transfer characteristics of the 0.5 mm and 1 mm straight channels are quite similar to those of the zigzag channel, but are better than those of the wavy channel. In the case of the 1 mm straight channel, the value of the volume-goodness factor is improved by about 26–28% compared to that of the original zigzag channel.