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The Role of Viscous and Capillary Forces in the Prediction of Critical Conditions Defining Super-Hydrophobic and Hydrophilic Characteristics
Chemical Engineering Science
  • Anita Panda
  • A. R. Pati
  • B. Saha
  • Aditya Kumar, Missouri University of Science and Technology
  • Soumya S. Mohapatra
Abstract

The prediction of the superhydrophobic/superhydrophilic behavior from the characteristics of post impinged droplet on a surface with the alteration of physical properties of fluid or the surface properties has gained much interest for the development of anti-fogging glass, gradient surface and anti-corrosion surfaces. The abovementioned characteristics are well described by the spreading, recoiling, rolling, and bouncing behaviors of the post impinged droplet and these phenomena are controlled by viscous and capillary forces. The proper combination of the capillary and viscous forces of a fluid leads to various levels of recoiling and spreading. However, in terms of the discussed forces, the conditions to attain superhydrophobicity/superhydrophilicity are not reported. Therefore, in the current work, an attempt has been made to predict critical conditions for the attainment of both superhydrophobic and superhydrophilic characteristics in terms of fluid and surface properties defining the post impingement behavior. The analysis of droplet dynamics reveals that the ratio of viscous force to capillary force (VF/CF) is considered as the defining parameters for super-hydrophobic and hydrophilic characteristics. For the attainment of superhydrophilic characteristics, VF/CF ratio must be greater than 30 x 10-4 and value below 2.9 x 10-4 generates superhydrophobicity. Furthermore, the role of viscosity and surface tension in droplet dynamics were also investigated by using Central Composite Design (CCD) analysis methodology and it confirms the existence of strong interaction between the viscosity and surface tension.

Department(s)
Materials Science and Engineering
Keywords and Phrases
  • Hydrophilicity,
  • Hydrophobicity,
  • Recoiling,
  • Spreading
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2019 Elsevier Ltd, All rights reserved.
Publication Date
11-1-2019
Citation Information
Anita Panda, A. R. Pati, B. Saha, Aditya Kumar, et al.. "The Role of Viscous and Capillary Forces in the Prediction of Critical Conditions Defining Super-Hydrophobic and Hydrophilic Characteristics" Chemical Engineering Science Vol. 207 (2019) p. 527 - 541 ISSN: 0009-2509
Available at: http://works.bepress.com/aditya-kumar/56/