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

Abstract

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 SiO 2 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 analyticalmore » 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.« less

Authors:
 [1];  [1];  [1];  [1];  [1];  [2];  [1]
  1. Pohang Univ. of Science and Technology, Pohang (Republic of Korea)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
National Research Foundation of Korea (NRF); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1478506
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
International Journal of Heat and Mass Transfer
Additional Journal Information:
Journal Volume: 124; Journal Issue: C; Journal ID: ISSN 0017-9310
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; Liquid-solid contact; Film boiling; Nucleation; Synchrotron X-ray imaging; Vapor layer progression

Citation Formats

Lee, Gi Cheol, Noh, Hyunwoo, Kwak, Ho Jae, Kim, Tong Kyun, Park, Hyun Sun, Fezzaa, Kamel, and Kim, Moo Hwan. Measurement of the vapor layer under a dynamic Leidenfrost drop. United States: N. p., 2018. Web. doi:10.1016/j.ijheatmasstransfer.2018.04.050.
Lee, Gi Cheol, Noh, Hyunwoo, Kwak, Ho Jae, Kim, Tong Kyun, Park, Hyun Sun, Fezzaa, Kamel, & Kim, Moo Hwan. Measurement of the vapor layer under a dynamic Leidenfrost drop. United States. doi:10.1016/j.ijheatmasstransfer.2018.04.050.
Lee, Gi Cheol, Noh, Hyunwoo, Kwak, Ho Jae, Kim, Tong Kyun, Park, Hyun Sun, Fezzaa, Kamel, and Kim, Moo Hwan. Tue . "Measurement of the vapor layer under a dynamic Leidenfrost drop". United States. doi:10.1016/j.ijheatmasstransfer.2018.04.050. https://www.osti.gov/servlets/purl/1478506.
@article{osti_1478506,
title = {Measurement of the vapor layer under a dynamic Leidenfrost drop},
author = {Lee, Gi Cheol and Noh, Hyunwoo and Kwak, Ho Jae and Kim, Tong Kyun and Park, Hyun Sun and Fezzaa, Kamel and Kim, Moo Hwan},
abstractNote = {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.},
doi = {10.1016/j.ijheatmasstransfer.2018.04.050},
journal = {International Journal of Heat and Mass Transfer},
number = C,
volume = 124,
place = {United States},
year = {2018},
month = {4}
}

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Figures / Tables:

Figure 1 Figure 1: Dynamics of Leidenfrost drop depending on Weber number (a) Static Leidenfrost drop with zero Weber number (b) Dynamic Leidenfrost drop, initially rebound then, levitating

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