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Effect of Surface Structures on Droplet Impact Over Flat and Cylindrical Surfaces

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Fluid Mechanics and Fluid Power, Volume 5 (FMFP 2022)

Part of the book series: Lecture Notes in Mechanical Engineering ((LNME))

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Abstract

In this chapter, droplet impact and bounce off over different hydrophobic surfaces have been studied numerically. For that volume of fluid based solver has been used. The solver has been validated with the experimental observations of droplet impact on a flat surface. At first droplet, impact over a flat surface with and without pillars and stripes has been studied and directional spreading dynamics has been investigated. The study has been further extended for cylindrical surfaces and droplet split-off has been observed. Thereafter effect of different types of structured surfaces (pillared, axially striped, and circumferentially stripped) on the droplet split-off phenomena has been observed and the fluidic reason behind has been analyzed. Also, droplet angle of wrap and height over cylinder has been compared for different surface structures.

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Abbreviations

ρ:

Density of phase (kg/m3)

µ:

Viscosity of phase (Pa s)

α:

Phase fraction (–)

D:

Diameter of cylinder (mm)

D0:

Initial diameter of droplet (mm)

Dmax:

Maximum spreading diameter (mm)

D*:

Diameter ratio D/D0

u:

Velocity (m/s)

g:

Accelaration due to gravity (m/s2)

σ:

Coefficient of Surface tension (N/m)

Fs:

Force due to surface tension (N)

κ:

Mean curvature of free surface (–)

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Author information

Authors and Affiliations

  1. Department of Mechanical Engineering, NIT Durgapur, Durgapur, 713209, India

    Saptaparna Patra

  2. Department of Mechanical and Industrial Engineering, IIT Roorkee, Roorkee, 247667, India

    Avik Saha & Arup Kumar Das

Authors
  1. Saptaparna Patra
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  2. Avik Saha
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  3. Arup Kumar Das
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Corresponding author

Correspondence to Avik Saha .

Editor information

Editors and Affiliations

  1. Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, India

    Krishna Mohan Singh

  2. Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, India

    Sushanta Dutta

  3. Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee, India

    Sudhakar Subudhi

  4. Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, India

    Nikhil Kumar Singh

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Patra, S., Saha, A., Das, A.K. (2024). Effect of Surface Structures on Droplet Impact Over Flat and Cylindrical Surfaces. In: Singh, K.M., Dutta, S., Subudhi, S., Singh, N.K. (eds) Fluid Mechanics and Fluid Power, Volume 5. FMFP 2022. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-99-6074-3_17

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  • DOI: https://doi.org/10.1007/978-981-99-6074-3_17

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  • Publisher Name: Springer, Singapore

  • Print ISBN: 978-981-99-6073-6

  • Online ISBN: 978-981-99-6074-3

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