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Drop impact on a hot surface: effect of a polymer additive

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Abstract

The impact of a drop on a hot surface is studied for Weber numbers between 20 and 220, and wall temperatures between 120 and 180°C. Drops of pure water are compared with drops of a dilute polyethylene oxide water solution (0.02% M). The additive is shown to inhibit drop splashing, the ejection of secondary droplets and mist formation. As previously observed, the polymer can also prevent drops from bouncing off a cold wall. This is no longer true if the wall is above the dynamic Leidenfrost temperature, which is lower for the polymer solution.

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Abbreviations

Ca :

capillary number (-)

d :

drop diameter (m)

D :

lamella diameter (m)

k :

coefficient in Eq. 3 (-)

g :

gravity acceleration (m/s2)

h :

fall height (m)

m :

drop mass (kg)

Oh :

Ohnesorge number (-)

R*:

mean radius of curvature of the drop (m)

R1, R2:

principal radii of curvature of the drop surface (m)

t :

time (s)

T :

temperature (°C)

u :

perpendicular component of the impact velocity (m/s)

u r :

retraction velocity of the lamella (m/s)

v :

velocity of secondary droplets (m/s)

w :

velocity of the fluid inside the drop (m/s)

We :

Weber number (-)

δ :

secondary droplet diameter (m)

ε̇ :

rate of elongation (s−1)

η :

viscosity (Pa s)

η e :

elongational viscosity (Pa s)

ρ :

density (kg/m3)

σ :

surface tension (N/m)

τ :

stress (Pa)

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Acknowledgement

Financial support from the European Union (HPMF-CT-2002–01938) is gratefully acknowledged.

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  1. Département de Physique, Ecole Normale Supérieure, 24 rue Lhomond, 75005, Paris, France

    V. Bertola

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  1. V. Bertola
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Bertola, V. Drop impact on a hot surface: effect of a polymer additive. Exp Fluids 37, 653–664 (2004). https://doi.org/10.1007/s00348-004-0852-9

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