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Motion of Leidenfrost self-propelled droplets on ratchet in low- and high-temperature regimes

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Abstract

Leidenfrost droplet experiments were conducted to investigate the movement of droplets on a ratchet in low- and high-temperature regimes (L and H regimes). Slightly above the threshold temperature, the terminal velocity increased with increasing temperature until it reached the highest value. After achieving the highest value, the terminal velocity gradually decreased with temperature until there was a significant decrease in the terminal velocity. Leidenfrost regimes were identified based on not only the droplet velocity but also the droplet shape and motion. In the H regime, there was a complete thin vapor film underneath the droplets, which caused them to levitate from the ratchet. However, in the L regime, there was no a complete vapor film underneath the droplets, causing direct contact between the droplets and ratchet, resulting in drastic nucleate boiling. This resulted in a faster vapor flow and generated a stronger rotational motion than that in the H regime. A stronger rotational motion results in a faster velocity in the translational direction.

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Acknowledgments

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (NRF-2022R1F1A1060895).

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Authors and Affiliations

  1. Department of Mechanical Engineering, Graduate School, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu, 41566, Korea

    Daeseong Jo

  2. School of Mechanical Engineering, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu, 41566, Korea

    Daeseong Jo

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  1. Daeseong Jo
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Correspondence to Daeseong Jo.

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Daeseong Jo is an Associate Professor in the School of Mechanical Engineering at Kyungpook National University. He received his Ph.D. degree in nuclear engineering from Purdue University, M.S. degree in aerospace engineering from Purdue University, and B.S. degree in mechanical engineering from University of Connecticut. His research interests are two-phase flows, phase change during boiling and condensation, heat transfer, and nuclear safety.

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Jo, D. Motion of Leidenfrost self-propelled droplets on ratchet in low- and high-temperature regimes. J Mech Sci Technol 37, 5425–5430 (2023). https://doi.org/10.1007/s12206-023-0941-4

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  • DOI: https://doi.org/10.1007/s12206-023-0941-4

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