Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 11, 2022 - September 14, 2022
In modern society where the words such as SDGs and carbon neutralization have become keywords, it is essential to study how to successfully reuse the unused heat energy, such as the factory heat removal, in the circular society. Therefore, we focused on studying the Leidenfrost phenomenon of liquid in order to convert the unused heat into energy that can be used again. When a liquid approaches the object whose temperature is much higher than the liquid's boiling point, the liquid droplets produce an insulating vapor layer that makes the droplets hover over the hot object. It is called Leidenfrost phenomenon. This non-contact state between the droplet and hot object hinders the heat transfer and increases the evaporation time dramatically. In general, temperature and object surface state will affect the evaporation time of the liquid in Leidenfrost state. In this research, we studied the relationship between the evaporation time and the releasability of object surface. The experimental results shown that the evaporation time was extended by subjecting the substrate to a releasable and non-adhesive treatment. Moreover, it is also necessary to investigate the effect of the change in the releasability of the substrate surface on the characteristic of droplets in the Leidenfrost state, which self-moves on a substrate having a serrated structure.
