Abstract We developed a simultaneous measurement technique for temperature distribution on a heated surface and gas-liquid interface motion of two-phase flows in microgap channel using temperature-sensitive paint (TSP). Since the TSP layer is optically transparent, the proposed method enables us to simultaneously measure the temperature distribution and the motion of gas-liquid interface through the TSP layer using an in-house stereoscope-like device. Since the refractive index of gas-phase differs from that of liquid-phase, the luminescent intensity of TSP in gas-phase varies from that in liquid-phase even though the temperatures are same in both phases. Then, we proposed a correction method for temperature distribution in gas-phase. To validate the proposed method, the temperature distribution measurements were conducted in liquid single-phase flow. The Nusselt numbers calculated from the measured temperatures were in good agreement with the Sieder-Tate equation. Then, we measured the temperature distributions for the boiling flows under several heated temperature conditions. The temperature distributions at growing bubble and bubble coalescence were successfully measured. TSP is useful method for investigating the temperature distribution in two-phase flows.

中文翻译：

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使用温敏涂料同时测量受热面气液界面运动和温度分布

摘要 我们开发了一种使用温敏涂料 (TSP) 对微间隙通道中两相流的受热表面温度分布和气液界面运动进行同步测量的技术。由于 TSP 层是光学透明的，所提出的方法使我们能够使用内部立体镜类设备通过 TSP 层同时测量温度分布和气液界面的运动。由于气相的折射率与液相的折射率不同，因此即使两相温度相同，气相中TSP的发光强度也与液相中不同。然后，我们提出了一种气相温度分布的校正方法。为了验证所提出的方法，温度分布测量是在液体单相流中进行的。根据测量温度计算的努塞尔特数与 Sieder-Tate 方程非常吻合。然后，我们测量了几种加热温度条件下沸腾流的温度分布。成功测量了气泡增长和气泡合并时的温度分布。TSP 是研究两相流中温度分布的有用方法。