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Visualization of the impact of water drops on a hot surface: effect of drop velocity and surface inclination

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Abstract

The behaviour of one drop impinging on a hot surface by varying the surface temperature, the drop velocity and the position of the surface (horizontal and a inclined 45°) both at a temperature below and above the Leidenfrost temperature has been experimentally evaluated, estimating the temperature at which the drop rebounds. A large influence on the drop velocity has been evidenced. The inclination of the surface decreases the critical value of the temperature above which the surface is not rewetted.

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Abbreviations

d :

drop falling height, mm

D :

drop diameter, m

Re :

Reynolds number ρuD/μ, –

u :

drop velocity, m/s

T :

temperature, °C

We :

Weber number Dρu 2/σ, –

μ:

dynamic viscosity, kg/m s

ρ :

density, kg/m3

σ :

surface tension, kg

Leid:

Leidenfrost

w:

wall

References

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Authors and Affiliations

  1. ENEA, Institute of Thermal-Fluid Dynamics, via Anguillarese 301, 00060, S. Maria di Galeria (Rome), Italy

    Gian Piero Celata, Andrea Mariani & Giuseppe Zummo

  2. Università di Roma “La Sapienza”, Palazzo Baleani, Corso Vittorio Emanuele II, 244 00186, Rome, Italy

    Maurizio Cumo

Authors
  1. Gian Piero Celata
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  2. Maurizio Cumo
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  3. Andrea Mariani
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  4. Giuseppe Zummo
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Correspondence to Gian Piero Celata.

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Celata, G.P., Cumo, M., Mariani, A. et al. Visualization of the impact of water drops on a hot surface: effect of drop velocity and surface inclination. Heat Mass Transfer 42, 885–890 (2006). https://doi.org/10.1007/s00231-006-0139-1

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  • DOI: https://doi.org/10.1007/s00231-006-0139-1

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