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

Journal Article · · International Journal of Heat and Mass Transfer
 [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)

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.

Research Organization:
Argonne National Lab. (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
Citation Metrics:
Cited by: 12 works
Citation information provided by
Web of Science

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Cited By (1)

Vibration isolation via Leidenfrost droplets journal June 2019

Figures / Tables (12)


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