This study presents the heat transfer analysis of 90° elbow microchannel flow with sharp and curved turn designs. Experimental technique of temperature-sensitive paint was adapted in the experiment for measuring both fluid and surface temperature. The detailed information of fluid and surface temperature data were successfully acquired with a microscope system at Reynolds number varying from 50.5 to 101.1. Micro heaters were fabricated and positioned underneath the microchannel to provide the constant heat flux boundary condition. The utilization of micro heaters can prevent the axial heat conduction. The Nusselt number contours were obtained in this study with sharp and curved corners, which can provide detailed information of localized region with high and low heat transfer. The experimental approach performed in this study could be applied in the future for micro heat exchanger or heat sink design with complex microchannel systems.

这项研究提出了90°弯头微通道流的急弯弯曲设计的传热分析。实验中采用了对温度敏感的涂料的实验技术，以测量液体和表面温度。使用显微镜系统成功获得了流体和表面温度数据的详细信息，雷诺数从50.5到101.1。制造了微加热器并将其放置在微通道下方，以提供恒定的热通量边界条件。利用微型加热器可以防止轴向热传导。在这项研究中获得了具有尖锐和弯曲拐角的Nusselt轮廓，这可以提供高和低热传递的局部区域的详细信息。