The thermal performance of wavy channels with different phase shifts (φ = 0° and 180°) introduced between the top and bottom conducting walls was experimentally investigated using a typical Mach-Zehnder interferometer. The experiments were performed on compact plane and wavy channels (with varying phase shifts and similar hydraulic diameters) in deionized water (Pr = 6.13) for a range of Reynolds numbers (Re = 350-1000). The interferometric fringes were recorded in both infinite and wedge fringe setting modes and then used to qualitatively and quantitatively analyze the local and average profiles of the thermal boundary layer thickness and heat transfer rates. The effects of the phase shifts and Reynolds numbers on the heat transfer rates are discussed. The experimental results show an increment in the heat transfer rates in the wavy channel geometries compared to straight channels, accompanied by an increased pressure drop. The thermal performance factor (TPF) was evaluated, and it was observed that the TPF increased with increasing Reynolds numbers in the wavy channels at both phase shifts (φ = 0° and 180°).

中文翻译：

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层流条件下波浪通道传热性能的实验研究：干涉法研究

使用典型的Mach-Zehnder干涉仪通过实验研究了在顶部和底部导电壁之间引入的具有不同相移（φ= 0°和180°）的波浪形通道的热性能。实验是在去离子水（Pr = 6.13）的一系列雷诺数（Re = 350-1000）的紧凑平面和波浪形通道（具有不同的相移和相似的水力直径）上进行的。干涉条纹以无限和楔条纹设置模式记录，然后用于定性和定量分析热边界层厚度和传热速率的局部和平均分布。讨论了相移和雷诺数对传热速率的影响。实验结果表明，与直通道相比，波浪通道几何形状的传​​热速率有所增加，同时压降也有所增加。评价了热性能因子（TPF），并且观察到在两个相移（φ= 0°和180°）处，波浪通道中的TPF随着雷诺数的增加而增加。