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The dynamics of the water droplet impacting onto hot solid surfaces at medium Weber numbers

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Abstract

The effects of the wettability of a droplet impacting onto a hot solid surface under medium Weber numbers were studied experimentally. The Weber numbers used in the present experiment were 52.1, 57.6, and 63.1. Three kinds of solid surfaces with different wettability were used. These were normal stainless steel (NSS), TiO2 coated NSS, and TiO2 coated NSS radiated with ultraviolet rays. The surface temperatures were varied from 60 to 200 °C. The image of side the view and 30° from horizontal were taken to explain the spreading and the interfacial behavior of a single droplet during impact the hot solid surfaces. It was found that under medium Weber numbers, the surface wettability plays an important role on the droplet spreading and evaporation time during the impact on the hot solid surfaces. The higher the wettability, the larger the droplet spreading on the hot surface, and the lower the evaporation time.

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Abbreviations

A:

Surface area (m2)

D, d:

Diameter (m)

h :

Latent heat of evaporation (kJ/kg)

q:

Heat flux (W/m2)

T:

Temperature (°C, K)

Q :

Heat (kJ)

u :

Droplet velocity (m/s)

We:

Weber number

β:

Spreading ratio

ρ:

Density (kg/m3)

σ:

Surface tension (N/m)

θ:

Contact angle (°)

τ:

Evaporation time (s)

∞:

Surrounding/ambient

corr :

Correction

drop :

Drop

g :

Gas

KY :

Kurabayashi–Yang

l :

Liquid

Leid :

Leidenfrost

max :

Maximum

o :

Origin

s :

Solid; surface, spreading

w :

Wall

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Acknowledgements

This research is partly supported by National Competitive Research Program Grant of Directorate of Higher Education, Ministry of Research, Technology and Higher Educations Republic of Indonesia.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Faculty of Engineering, Gadjah Mada University, Jl. Grafika No. 2, Yogyakarta, 55281, Indonesia

    Windy H. Mitrakusuma

  2. Department of Mechanical and Industrial Engineering, Faculty of Engineering, Gadjah Mada University, Jl. Grafika No. 2, Yogyakarta, 55281, Indonesia

    Samsul Kamal,  Indarto,  Hermawan &  Deendarlianto

  3. Department of Mechanical Engineering, Lampung University, Jl. Prof. Dr. Sumantri Brojonegoro No. 1, Bandar Lampung, Indonesia

    M. Dyan Susila

  4. Department of Refrigeration and Air Conditioning, Politeknik Negeri Bandung, Jl. Gegerkalong Hilir, Ds. Ciwaruga, Kotak Pos 1234, Bandung, Indonesia

    Windy H. Mitrakusuma

  5. Centre for Energy Studies, Gadjah Mada University, Sekip K-1A Kampus UGM, Yogyakarta, 55281, Indonesia

    Samsul Kamal,  Indarto &  Deendarlianto

Authors
  1. Windy H. Mitrakusuma
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  2. Samsul Kamal
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  3. Indarto
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  4. M. Dyan Susila
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  5. Hermawan
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  6. Deendarlianto
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Correspondence to Deendarlianto.

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Mitrakusuma, W.H., Kamal, S., Indarto et al. The dynamics of the water droplet impacting onto hot solid surfaces at medium Weber numbers. Heat Mass Transfer 53, 3085–3097 (2017). https://doi.org/10.1007/s00231-017-2053-0

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  • DOI: https://doi.org/10.1007/s00231-017-2053-0

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