THERMAL SCIENCE

International Scientific Journal

Thermal Science - Online First

online first only

Effect of surface micromorphology and hydrophobicity on condensation efficiency of droplets using the lattice Boltzmann method

ABSTRACT
In the present study, the effects of the surface morphology and surface hydrophobicity on droplet dynamics and condensation efficiency are investigated using the lattice Boltzmann method (LBM). Different surface morphologies may have different condensation heat transfer efficiencies, resulting in diverse condensation rates under the same conditions. The obtained results show that among the studied morphologies, the highest condensation rate can be achieved for conical microstructures followed by the triangle microstructure, and the columnar microstructure has the lowest condensation rate. Moreover, it is found that when the surface microstructure spacing is smaller and the surface microstructure is denser, the condensation heat transfer between the surface structure and water vapor facilitates, thereby increasing the condensation efficiency of droplets. Furthermore, the condensation process of droplets is associated with the surface hydrophobicity. The more hydrophobic the surface, the more difficult the condensation heat transfer and the longer the required time for droplet nucleation. Meanwhile, a more hydrophobic surface means that it is harder for droplets to gather and merge, and the corresponding droplet condensation rate is also lower.
KEYWORDS
PAPER SUBMITTED: 2021-05-06
PAPER REVISED: 1970-01-01
PAPER ACCEPTED: 2021-07-17
PUBLISHED ONLINE: 2021-10-10
DOI REFERENCE: https://doi.org/10.2298/TSCI210506287L
REFERENCES
  1. Khawaji, A.D., et al., Advances in Seawater Desalination Technologies, Desalination, 221. (2008), 3, pp. 47-69
  2. Boreyko, J.B., et al., Vapor Chambers with Jumping-drop Liquid return from Superhydrophobic Condensers, International Journal of Heat & Mass Transfer, 61. (2013), 6, pp. 409-418
  3. Rose, J.W., Dropwise Condensation Theory and Experiment: A review, Proc.imeche Part A2 J.power & Energy, 216. (2005), 2, pp. 115-128
  4. Zhang, K., et al., Ratio Dependence of Contact Angle for Droplet Wetting on Chemically Heterogeneous Substrates, Colloids & Surfaces A Physicochemical & Engineering Aspects, 539. (2017), 3,pp. 237-242
  5. Pan, B., et al., Wetting Dynamics of Nanoliter Water Droplets in Nanoporous Media, Journal of Colloid and Interface Science, 589. (2020)
  6. Jung, Y.C., et al., Wetting Behaviour during Evaporation and Condensation of Water Microdroplets on Superhydrophobic Patterned Surfaces, Journal of Microscopy, 229. (2010), 1, pp. 127-140
  7. Cheng, J., et al., Condensation Heat Transfer on Two-Tier Superhydrophobic Surfaces, Applied Physics Letters, 101. (2012), 13, p. 173108
  8. Miljkovic, N., et al., Jumping-droplet Electrostatic Energy Harvesting, Applied Physics Letters, 105. (2014), 1, p. 175
  9. Wen, R., et al., Hierarchical Superhydrophobic Surfaces with Micropatterned Nanowire Arrays for High-Efficiency Jumping Droplet Condensation, Acs Applied Materials & Interfaces. (2017), p. 44911
  10. Xie, J., et al., Dropwise Condensation on Superhydrophobic Nanostructure Surface, Part I: Long-term Operation and Nanostructure Failure, International Journal of Heat and Mass Transfer, 129. (2018), 6, pp. 86-95
  11. Chen, X., et al., Characterization of Coalescence-Induced Droplet Jumping Height on HierarchicalSuperhydrophobic Surfaces, ACS Omega, 2. (2017), 6, pp. 2883-2890
  12. Sazhin, S.S., et al., Transient Heating of An Evaporating Droplet, International Journal of Heat & Mass Transfer, 53. (2010), 14, pp. 2826-2836
  13. Alam, M.S., et al., Comparative Molecular Dynamics Simulations of Homogeneous Condensation of Refrigerants, International Journal of Thermal Sciences, 141. (2019), 5, pp. 187-198
  14. Raabe, D., Overview of the Lattice Boltzmann Method for Nano and Microscale Fluid Dynamics in Materials Science and Engineering, Modelling Simul.mater.sci.eng, 12. (2004), 3, pp. 11-15
  15. Varnik, F., et al., Stability and Dynamics of Droplets on Patterned Substrates: Insights from Experiments and Lattice Boltzmann Simulations, Journal of Physic: Condensed Matter, 23. (2011), 18, p. 184112
  16. Rui, W., et al., Bio‚ÄźInspired Superhydrophobic Closely Packed Aligned Nanoneedle Architectures for Enhancing Condensation Heat Transfer, Advanced Functional Materials, 28. (2018), 49
  17. 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
  18. 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
  19. Shi, Y., et al., Investigation of Coalesced Droplet Vertical Jumping and Horizontal moving on Textured Surface using the Lattice Boltzmann Method, Computers and Mathematics with Applications, 75. (2017), 4, pp. 1213-1225
  20. Zhang, Q., et al., Lattice Boltzmann Modeling of Droplet Condensation on Superhydrophobic Nanoarrays, Langmuir, 30. (2014), 42, pp. 12559-12569
  21. Yu, J., et al., Effects of Geometrical Characteristics of Surface Roughness on Droplet Wetting, The Journal of Chemical Physics, 127. (2007), 23, pp. 234704-234704
  22. Bo, Z., et al., Spontaneous Wenzel to Cassie dewetting transition on structured surfaces, Physical Review Fluids, 1. (2016), 7
  23. Li, M., et al., Study on Nucleation Position and Wetting State for Dropwise Condensation on Rough Structures with Different Wettability using Multiphase Lattice Boltzmann Method, International Journal of Heat and Mass Transfer, 131. (2019), 5, pp. 96-100
  24. Shan, X., et al., Lattice Boltzmann Model for Simulating Flows with Multiple Phases and Components, Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics, 47. (1993), 3, pp. 1815-1819
  25. Liang, G., et al., Study on Droplet Nucleation Position and Jumping on Structured Hydrophobic Surface using the Lattice Boltzmann Method, Thermal Science. (2021), 4, p. 149
  26. Mazloomi, A., et al., Gravity-driven thin Liquid Films over Topographical Substrates, European Physical Journal E, 36. (2013), 6, p. 58
  27. Haibo, et al., Proposed Approximation for Contact Angles in Shan-and-Chen-type Multicomponent Multiphase Lattice Boltzmann Models, Physical Review E. (2007),
  28. Hao, P.F., et al., Wetting Property of Smooth and Textured Hydrophobic Surfaces under Condensation Condition, Science China, 57. (2014), 11, pp. 2127-2132
  29. Zou, Q., et al., On Pressure and Velocity Boundary Conditions for the Lattice Boltzmann BGK model, Physics of Fluids, 9. (1996), 6
  30. Xin, W.A., et al., Lattice Boltzmann Simulation of Dropwise Condensation on the Microstructured Surfaces with Different Wettability and Morphologies, International Journal of Thermal Sciences, 160.