Measurement of the vapor layer under a dynamic Leidenfrost drop

Lee, Gi Cheol; Noh, Hyunwoo; Kwak, Ho Jae; Kim, Tong Kyun; Park, Hyun Sun; Fezzaa, Kamel; Kim, Moo Hwan

doi:10.1016/j.ijheatmasstransfer.2018.04.050

Title: Measurement of the vapor layer under a dynamic Leidenfrost drop

Journal Article · 24 April 2018 · International Journal of Heat and Mass Transfer

DOI: https://doi.org/10.1016/j.ijheatmasstransfer.2018.04.050 · OSTI ID:1478506

Lee, Gi Cheol ^[1]; Noh, Hyunwoo ^[1]; Kwak, Ho Jae ^[1]; Kim, Tong Kyun ^[1]; Park, Hyun Sun ^[1]; Fezzaa, Kamel ^[2]; Kim, Moo Hwan ^[1]

Pohang Univ. of Science and Technology, Pohang (Republic of Korea)
Argonne National Lab. (ANL), Argonne, IL (United States)

To understand the Leidenfrost phenomenon, which is the results of formation of a thin vapor layer, the progression of the vapor should be analyzed. However, due to the limitation of measuring techniques, the empirical measurement of the vapor layer under a dynamic Leidenfrost drop as a function of time has not been reported because the vapor is only tens of micrometers thick and forms within a tenth of a millisecond. Therefore, this paper presents a synchrotron X-ray imaging with the precise resolution to overcome the limitation of previous measurement technique. The liquid-vapor interfacial behavior of a drop of ethanol that is being levitated above a flat SiO₂ surface by the Leidenfrost phenomenon is analyzed depending on surface temperature. Measurements suggest that a thin (< 2 μm) vapor layer develops between the surface and the drop; i.e. that the liquid does not contact the solid. The measured thickness of this vapor layer under a dynamic Leidenfrost drop was less than the thickness of the vapor layer estimated by analytical solution of a model of vapor layer thickness for a static Leidenfrost drop. As a result, the new technique presented in this study will support transient numerical simulations or an analytical solution of the vapor layer under a dynamic Leidenfrost drop, and may have applications in research on the effects of artificial surface structure on the Leidenfrost phenomenon.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: National Research Foundation of Korea (NRF); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1478506

Journal Information:: International Journal of Heat and Mass Transfer, Vol. 124, Issue C; ISSN 0017-9310

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 18 works

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