March 2024

We published an article on liquid film temperature and thickness measurements in the heat transfer oil Marlotherm LH relevant for electric and electronic applications. The applied two-color laser-induced fluorescence technique is based on the temperature-sensitive fluorescence dye nile red that is doped to the heat transfer oil. Fluorescence was excited by using a Nd:YAG-laser at 532 nm. The temperature determination was realized by two sCMOS-cameras equipped with suitable band pass filters. The jet-wall interaction was studied for a cold oil jet impinging on a heated surface. The study revealed an increasing film temperature and decreasing film thickness (on average from 0.24 to 0.17 mm) with increasing solid temperature (which varied between 298 K and 398 K).

The article was published in the prestigious journal "Experiments in Fluids". The full paper is freely available here: https://link.springer.com/article/10.1007/s00348-024-03782-4