Proceedings of the 27th National and 5th International ISHMT-ASTFE Heat and Mass Transfer Conference December 14-17, 2023, IIT Patna, Patna-801106, Bihar, India
Postponement of dynamic Leidenfrost phenomenon during impact of Oil/water (O/W) Emulsions droplet
Аннотация
Leidenfrost effect is the phenomenon where a droplet upon
impacting on a heated surface levitates above a cushion of
stable vapor layer beneath it. Leidenfrost point or temperature
(LFT) is referred as the temperature at which the heat transfer
performance deteriorates as the stable vapor layer acts as an
insulator between the drop and the substrate. Delay of the
Leidenfrost effect is essential to avoid burnout in several
industrial applications. There have been efforts to increase the Leidenfrost point by addition of surfactants, polymers or
nanobubbles to the working fluid. In addition, microtextured
surfaces also proved to be useful in delaying the Leidenfrost
point. The present work aims to increase the LFT by use of
microemulsions of oil and water. We have shown the different
impact dynamics of drops of microemulsions at various substrate temperatures. Overall, the microemulsion drops exhibited higher LFTs. The dependence of LFTs with governing parameters like Weber number and Ohnesorge number is also discussed.