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Title: Lattice Boltzmann modeling of self-propelled Leidenfrost droplets on ratchet surfaces

Journal Article · · Soft Matter
DOI:https://doi.org/10.1039/C5SM01353D· OSTI ID:1329863
 [1];  [2];  [3];  [4]
  1. Central South Univ., Changsha (China). School of Energy Science and Engineering; Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Computational Earth Science Group
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Computational Earth Science Group
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Fluid Dynamics and Solid Mechanics
  4. Southwest Univ. of Science and Technology, Mianyang (China). School of Civil Engineering and Architecture

Here in this paper, the self-propelled motion of Leidenfrost droplets on ratchet surfaces is numerically investigated with a thermal multiphase lattice Boltzmann model with liquid-vapor phase change. The capability of the model for simulating evaporation is validated via the D2 law. Using the model, we first study the performances of Leidenfrost droplets on horizontal ratchet surfaces. It is numerically shown that the motion of self-propelled Leidenfrost droplets on ratchet surfaces is owing to the asymmetry of the ratchets and the vapor flows beneath the droplets. It is found that the Leidenfrost droplets move in the direction toward the slowly inclined side from the ratchet peaks, which agrees with the direction of droplet motion in experiments [Linke et al., Phys. Rev. Lett., 2006, 96, 154502]. Moreover, the influences of the ratchet aspect ratio are investigated. For the considered ratchet surfaces, a critical value of the ratchet aspect ratio is approximately found, which corresponds to the maximum droplet moving velocity. Furthermore, the processes that the Leidenfrost droplets climb uphill on inclined ratchet surfaces are also studied. Lastly, numerical results show that the maximum inclination angle at which a Leidenfrost droplet can still climb uphill successfully is affected by the initial radius of the droplet.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program; National Natural Science Foundation of China (NSFC); Foundation for the Author of National Excellent Doctoral Dissertation of China
Grant/Contract Number:
AC52-06NA25396; 51506227; 201439
OSTI ID:
1329863
Report Number(s):
LA-UR-15-24100
Journal Information:
Soft Matter, Vol. 12, Issue 1; ISSN 1744-683X
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 46 works
Citation information provided by
Web of Science

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Cited By (9)

Entropy production in thermal phase separation: a kinetic-theory approach journal January 2019
The nanoscale Leidenfrost effect journal January 2019
Discrete fluidization of dense monodisperse emulsions in neutral wetting microchannels journal January 2020
Controllable Leidenfrost glider on a shallow water layer journal November 2018
Self-propelling Leidenfrost droplets on a variable topography surface journal December 2018
High-speed side-shooter using Leidenfrost phenomena journal April 2019
Numerical study on vapor–liquid phase change in an enclosed narrow space journal November 2019
Entropy production in thermal phase separation: a kinetic-theory approach text January 2018
Discrete fluidization of dense monodisperse emulsions in neutral wetting microchannels text January 2019

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