Thermal hysteresis in wettability and the Leidenfrost phenomenon

Author:

Kita Yutaku12ORCID,Kida Kensuke2,Ariyoshi Takaaki2,Hidaka Sumitomo2ORCID,Kohno Masamichi22ORCID,Takata Yasuyuki23ORCID

Affiliation:

1. King's College London

2. Kyushu University

3. University of Edinburgh

Abstract

The Leidenfrost temperature (TL), at which the liquid drop lifetime peaks on a superheated surface, is believed to be wettability dependent. Here, we show that the wettability effect on TL is subject to the history of the surface temperature. Observing a water drop evaporating on a polished stainless-steel surface heated from 100 to 400C in argon gas, we find TL265C. We then repeat the experiment along decreasing temperature and find a TL increase by 10 K, i.e., TL275C. This thermal hysteresis is due to a reduced contact angle during heating. Once hydrophilized, the hysteresis disappears until the contact angle recovers. Similar observations are made in the air where oxidation is possible. Published by the American Physical Society 2024

Funder

New Energy and Industrial Technology Development Organization

Japan Society for the Promotion of Science

Publisher

American Physical Society (APS)

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