With substantial size and performance advantages, microchannel heat exchangers have been attracting increasing attention for various energy recovery and conversion processes. While much research and recent studies focus on their applications and performance, few studies have been devoted to the measurement and dimensional accuracy of actual microchannels in use. In this study, in-depth geometric characterization of a microchannel heat exchanger manufactured using standard photochemical etching and diffusion bonding processes is carried out. The measured channel dimensions are then compared with the design values, which can help better interpret experiment data of the heat exchanger for model validation. Two nondestructive methods were developed to measure cross-sectional areas and perimeters of the microchannels. The first method uses a stereoscopic microscope to take images of the exhaust channels at one end of the microchannel heat exchanger. An image processing routine was de...

中文翻译：

---

用于性能验证的微通道换热器的几何测量和表征

由于具有实质性的尺寸和性能优势，微通道热交换器已在各种能量回收和转换过程中引起越来越多的关注。尽管许多研究和最新研究都集中在它们的应用和性能上，但很少有研究致力于实际使用的微通道的测量和尺寸精度。在这项研究中，对使用标准光化学蚀刻和扩散键合工艺制造的微通道热交换器进行了深入的几何表征。然后将测得的通道尺寸与设计值进行比较，这可以帮助更好地解释热交换器的实验数据以进行模型验证。开发了两种非破坏性方法来测量微通道的横截面积和周长。第一种方法是使用立体显微镜在微通道热交换器的一端拍摄排气通道的图像。图像处理例程被删除。