Drying rate depending on curvature?

In summary, the conversation discusses the evaporation rate of a droplet of water on a curved surface. If the droplet has a smaller radius than the surface, the droplet on a convex surface will have a larger surface area and thus evaporate faster. This is because there will be more heat flow from the surface to the droplet. However, in a perfect non-wetting scenario with the same surface area, the evaporation rate would be similar for both the concave and convex surfaces.
  • #1
jangheej
19
0
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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  • #2
It's the one with the larger surface area that evaporates faster.
 
  • #3
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.
 
  • #4
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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  • #5
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.
 

1. What is the relationship between curvature and drying rate?

The relationship between curvature and drying rate is an inverse one. This means that as the curvature of a surface increases, the drying rate decreases. This is because a curved surface has a larger surface area compared to a flat surface, leading to a longer drying time.

2. How does the shape of an object affect its drying rate?

The shape of an object can influence its drying rate due to its curvature. Objects with a curved surface will have a slower drying rate compared to those with a flat surface. This is because a curved surface has a larger surface area, which takes longer to dry.

3. Does the material of an object affect its drying rate?

Yes, the material of an object can affect its drying rate. Porous materials, such as wood or paper, have a higher drying rate compared to non-porous materials, such as metal or plastic. This is because porous materials can absorb and release moisture more easily.

4. How does temperature impact the drying rate of curved surfaces?

Temperature can significantly impact the drying rate of curved surfaces. Higher temperatures can speed up the drying process, while lower temperatures can slow it down. This is due to the fact that higher temperatures can increase the rate of evaporation, leading to faster drying.

5. Can the orientation of a curved surface affect its drying rate?

Yes, the orientation of a curved surface can affect its drying rate. Surfaces that are exposed to direct sunlight or airflow will have a faster drying rate compared to those that are shaded or have limited airflow. This is because sunlight and airflow can help to evaporate moisture more quickly.

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