Drying rate depending on curvature?

  • Thread starter jangheej
  • Start date
  • #1
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?
 

Answers and Replies

  • #2
174
0
It's the one with the larger surface area that evaporates faster.
 
  • #3
Andy Resnick
Science Advisor
Education Advisor
Insights Author
7,509
2,078
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
19
0
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)
 

Attachments

  • #5
Andy Resnick
Science Advisor
Education Advisor
Insights Author
7,509
2,078
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.
 

Related Threads on Drying rate depending on curvature?

Replies
4
Views
993
Replies
0
Views
665
  • Last Post
Replies
1
Views
6K
  • Last Post
Replies
1
Views
631
  • Last Post
Replies
18
Views
2K
  • Last Post
Replies
8
Views
6K
Replies
4
Views
2K
  • Last Post
Replies
21
Views
6K
Replies
2
Views
2K
  • Last Post
Replies
7
Views
3K
Top