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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
December, 14-17, 2023, Bihar, India

Postponement of dynamic Leidenfrost phenomenon during impact of Oil/water (O/W) Emulsions droplet

Get access (open in a dialog) DOI: 10.1615/IHMTC-2023.1610
pages 993-996


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.