Super Resolution Reconstruction of Temperature Field of Falling Film Based on PLIF40

The temperature field of falling film is crucial of the heat transfer characteristics. However, falling film interface topology and temperature distribution are constantly changing, which is challenging for the analysis of heat transfer characteristics. The Planar Laser-Induced Fluorescence (PLIF) measurement method enables highly accurate and non-intrusive. The PLIF40 method effectively minimizes the influence of total reflection, which ensures the true film thickness more accurately and reliably from complex interfacial waves. In this paper, the super resolution reconstruction algorithm is designed for the falling film by PLIF40. It is utilized to improve the resolution of the falling film images. Moreover, noise is eliminated and the edge of the liquid film is smoothed. The temperature information is accurately extracted, and the heat transfer coefficient and Nusselt number of the temperature field are quantified. The effectiveness of the method is verified by numerical calculations and experiments. Finally, the heat transfer characteristics of the falling film are further investigated.