Drying rate depending on curvature?

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    Curvature Drying Rate
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SUMMARY

The evaporation rate of a water droplet on curved surfaces is influenced by the surface area available for evaporation. A droplet on a convex surface, given the same radius of curvature and contact angle, has a larger surface area and evaporates faster than one on a concave surface. However, in cases of perfect non-wetting, where heat transfer is minimal, the evaporation rates may equalize due to similar surface areas. This highlights the critical role of surface curvature and contact angle in evaporation dynamics.

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jangheej
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hi all =D
i have a question about evaporation rate depending on curvature.
say a droplet of water is placed on a curved surface- one concave, one convex but with the same radius of curvature.
will the evaporation rate be different?
 
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It's the one with the larger surface area that evaporates faster.
 
jangheej said:
hi all =D
i have a question about evaporation rate depending on curvature.
say a droplet of water is placed on a curved surface- one concave, one convex but with the same radius of curvature.
will the evaporation rate be different?

If the drop radius is less than that of the curved surface and the contact angle is the same for both cases, the drop on a convex surface will have a larger surface area and thus evaporate faster.
 
Andy Resnick said:
If the drop radius is less than that of the curved surface and the contact angle is the same for both cases, the drop on a convex surface will have a larger surface area and thus evaporate faster.


different surface area? why?
the droplet is just resting on the surface (see the image below)
 

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jangheej said:
different surface area? why?
the droplet is just resting on the surface (see the image below)

You drew a very special case- perfect non-wetting. In that case, there is hardly any heat flow from the surface to the droplet. And since the surface area is the same for the two cases, the rate of evaporation should be about the same.
 

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