THERMAL SCIENCE

International Scientific Journal

STUDY ON DROPLET NUCLEATION POSITION AND JUMPING ON STRUCTURED HYDROPHOBIC SURFACE USING THE LATTICE BOLTZMANN METHOD

ABSTRACT
In this study, droplet nucleation and jumping on the conical micro-structure surface is simulated using the lattice Boltzmann method. The nucleation and jumping laws of the droplet on the surface are summarized. The numerical results suggest that the height and the gap of the conical micro-structure exhibit a significant influence on the nucleation position of the droplet. When the ratio of height to the gap of the micro-structure (H/D) is small, the droplet tends to nucleate at the bottom of the structure. Otherwise, the droplet tends to nucleate to-wards the side of the structure. The droplet grown in the side nucleation mode possesses better hydrophobicity than that of the droplet grown in the bottom nucleation mode and the droplet jumping becomes easier. Apart from the coalescence of the droplets jumping out of the surface, jumping of individual droplets may also occur under certain conditions. The ratio of the clearance to the width of the conical micro-structure (D/F) depends on the jumping mode of the droplet. The simulation results indicate that when the D/F ratio is greater than 1.2, the coalescence jump of droplets is likely to occur. On the contrary, the individual jump of droplets is easy to occur.
KEYWORDS
PAPER SUBMITTED: 2020-12-06
PAPER REVISED: 2021-02-04
PAPER ACCEPTED: 2021-02-18
PUBLISHED ONLINE: 2021-04-10
DOI REFERENCE: https://doi.org/10.2298/TSCI201206149L
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2022, VOLUME 26, ISSUE Issue 2, PAGES [1477 - 1486]
REFERENCES
  1. Lef, E, et al., Heat-transfer Measurements during Dropwise Condensation of Steam, International Journal of Heat & Mass Transfer, 7. (1964), 2, pp. 272-273
  2. Ma, X., et al., Advances in Dropwise Condensation Heat Transfer: Chinese Research, Chemical Engineering Journal, 78. (2000), 3, pp. 87-93
  3. Kin, S., et al., Dropwise Condensation Modeling Suitable for Superhydrophobic Surfaces, Journal of Heat Transfer, 133. (2011), 8, p. 081502
  4. Wen, R.F., et al., Liquid-vapor Phase-change Heat Transfer on Functionalized Nanowired Surfaces and Beyond, Joule, 14. (2018), 8, pp. 2307-2347
  5. Khan, S.A., et al., Review of Micro-nanoscale Surface Coatings Application for Sustaining Dropwise Condensation, Coatings, 9. (2019), 2, p. 117
  6. Rose, J.W., Dropwise Condensation Theory and Experiment: A Review, Proc.imeche Part A2 J.power & Energy, 216. (2005), 2, pp. 115-128
  7. Sokuler, M., et al., Dynamics of Condensation and Evaporation: Effect of Inter-drop Spacing, Europhysics Letters, 89. (2010), 3, pp. 275-288
  8. Yao, C.W., et al., Wetting Behavior on Hybrid Surfaces with Hydrophobic and Hydrophilic Properties, Applied Surface Science, 290. (2014), 1, pp. 59-65
  9. Mahapatra, P.S., et al., Key Design and Operating Parameters for Enhancing Dropwise Condensation Through Wettability Patterning, International Journal of Heat & Mass Transfer, 92. (2016), 1, pp. 877-883
  10. Starostin, et al., Drop-wise and Film-wise Water Condensation Processes Occurring on Metallic Micro-scaled Surfaces, Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis & Behaviour of Materials, 444. (2018), 3, pp. 604-609
  11. Mishchenko, L., et al., Design of Ice-free Nanostructured Surfaces Based On Repulsion of Impacting Water Droplets, Acs Nano, 4. (2010), 12, pp. 7699-7707
  12. Zhu, J., et al., Clustered Ribbed-Nanoneedle Structured Copper Surfaces with High-Efficiency Dropwise Condensation Heat Transfer Performance, Acs Applied Materials & Interfaces, 20. (2015), 7, pp. 10660-10665
  13. Rui, W., et al., Bio-Inspired Superhydrophobic Closely Packed Aligned Nanoneedle Architectures for Enhancing Condensation Heat Transfer, Advanced Functional Materials, 28. (2018), 7, p. 1800634
  14. Checco, A., et al., Robust Superhydrophobicity in Large-area Nanostructured Surfaces Defined by Block-copolymer Self Assembly, Advanced Materials, 26. (2014), 6, pp. 886-891
  15. Boreyko, J.B., et al., Self-propelled Dropwise Condensate on Superhydrophobic Surfaces, Physical Review Letters, 103. (2009), 18, p. 184501
  16. Rykaczewski, K., et al., How Nanorough is Rough Enough to Make a Surface Superhydrophobic during Water Condensation?, Soft Matter, 8. (2012), 33, pp. 8786-8794
  17. Miljkovic, N., et al., Effect of Droplet Morphology on Growth Dynamics and Heat Transfer during Condensation on Superhydrophobic Nanostructured Surfaces, Acs Nano, 6. (2012), 2, pp. 1776-1785
  18. Chen, X., et al., Nanograssed Micropyramidal Architectures for Continuous Dropwise Condensation, Advanced Functional Materials, 21. (2015), 24, pp. 4617-4623
  19. Miljkovic, N., et al., Jumping-Droplet-Enhanced Condensation on Scalable Superhydrophobic Nanostructured Surfaces, Nano Letters, 13. (2013), 1, pp. 179-187
  20. Miljkovic, N., et al., Electric-Field-Enhanced Condensation on Superhydrophobic Nanostructured Surfaces, Acs Nano, 7. (2013), 12, pp. 11043-11054
  21. Peng, B., et al., Analysis of Droplet Jumping Phenomenon with Lattice Boltzmann Simulation of Droplet Coalescence, Applied Physics Letters, 102. (2013), 15, pp. 1776-1785
  22. Raabe, D., Overview of the Lattice Boltzmann Method for Nano- and Microscale Fluid Dynamics in Materials Science and Engineering, Moding and Simulation in Materials Science and Engineering, 12. (2004), 3, pp. 11-15
  23. Varnik, F., et al., Stability and Dynamics of Droplets on Patterned Substrates: Insights from Experiments and Lattice Boltzmann Simulations, Journal of Physics-Condensed Matter, 23. (2011), 18, p. 184112
  24. Bo, Z., et al., Spontaneous Wenzel to Cassie Dewetting Transition on Structured Surfaces, Physical Review Fluids, 1. (2016), 11, p. 073904
  25. Li, Q., et al., Enhancement of Boiling Heat Transfer using Hydrophilic-Hydrophobic Mixed Surfaces: A Lattice Boltzmann Study, Applied Thermal Engineering, 105. (2017), 12, p. S1359431117371405
  26. Zhang, Q., et al., Lattice Boltzmann Modeling of Droplet Condensation on Superhydrophobic Nanoarrays, Langmuir, 30. (2014), 42, pp. 12559-12569
  27. Shi, Y., et al., Tang, Investigation of Coalesced Droplet Vertical Jumping and Horizontal moving on Textured Surface using the Lattice Boltzmann Method, Computers & Mathematics with Applications, 75. (2017), 4, pp. 1213-1225
  28. Huang, H., et al., Proposed Approximation for Contact Angles in Shan-and-Chen-type Multicomponent Multiphase Lattice Boltzmann Models, Physical.Review.E, 76. (2007), 6, p. 066701
  29. Zou, Q., et al., On Pressure and Velocity Boundary Conditions for the Lattice Boltzmann BGK Model, Physics of Fluids, 9. (1997), 6, pp. 1591-1598
  30. Ashrafi-Habibabadi, A.,et al., Droplet Condensation and Jumping on Structured Superhydrophobic Surfaces, International Journal of Heat and Mass Transfer, 134. (2019), 5, pp. 680-693

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence