Questions tagged [wetting]
The wetting tag has no usage guidance.
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Height of a stable droplet on a perfectly wetting surface, shape of a water drop
I would like to clarify that this is not a homework question, but a problem that I chose to want to solve to satisfy my curiosity. I would like to understand whether the physical concepts I have ...
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How does wetting cotton increase its UV transparency?
Anecdotally, a dry cotton T-shirt prevents sunburn better than a wet one.
This has also been measured (Gambichler et al., "Influence of wetness on the ultraviolet protection factor (UPF) of ...
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Why do some objects tend to sink after some time in water even if they float at the start?
I have observed this phenomenon in swimming pools: I have seen many dead insects floating on the surface, but after some time some they tend to sink down without any external influence. Why does this ...
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How to make straight wetting angle between water and glass
Looking for any liquid (preferably non hazard and transparent) which is immiscible with water in order to make a 90 degrees wetting angle with glass. Water+liquid should from a 90 degrees wetting ...
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What does a negative wetting tension $\delta F$ mean?
If a solid polymer has a drop of liquid (water) and shows a negative value of wetting tension, what does this mean? Does this mean that the drop of liquid will bead up instead of spreading on the ...
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Derivative of volume with respect to surface area in Young-Laplace $\frac{\partial V}{\partial A}=(1/R_1+1/R_2)^{−1}$
While studying Physical chemistry of interfaces, from:
Page 42 (chapter 3 , section on "equilibrium conditions") in Butt, H. J., Graf, K., & Kappl, M. (2013). Physics and chemistry of ...
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Which kind of paper has highest absorption speed? [closed]
I am experimenting to analyse the liquid wicking(radial) behaviour of various liquids. I have performed initial studies and experiments on household paper towels but they tend to deform and stick to ...
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In nature, (generally) when liquid molecules lies on a solid surface which model does it came close with?
In nature, (generally) when liquid molecules lies on a solid surface which model does it came close with? {Does water molecules lies on solid interface with air pocket or without air pocket?} Cassie-...
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Stainless Steel in Kitchen Dishwasher Doesn't Dry
I find that stainless steel tools, especially the shiny ones, stay wet after the (no heat) dry cycle while ceramic plates are dry. The water beads on the shiny surfaces but perhaps less on rougher ...
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How does surface tension prevent a pin from sinking?
Please explain simply how surface tension in water which as far as I understand is a force pulling the water molecules at the surface towards each other horizontally so how does that prevent a ...
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Reason for motion of a fluid
I was making coffee for myself, when I observed that when I poured coffee from the frying pan (having curved edges), the fluid went directly into the cup without falling; but when I transferred coffee ...
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Is there some easy way to change the wettability of a sphere?
I am doing some experiments with spheres impacting a body of water and would like to change the wettability of the sphere. Is there some relatively easy way to do this? A procedure in one paper is ...
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When does water decrease or increase friction?
Water often acts as a lubricant e.g. a wet floor or road, but sometimes the reverse happens e.g. putting on wet clothes. I understand that surface tension is involved e.g. microscope slides sticking ...
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The vertical component of surface tensions in wetting
To find the contact angle made by a droplet on a flat surface at equilibrium, we take the sum of all surface tensions at the boundary of the droplet to be equal to zero (Wikipedia link). Projecting ...
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What determines the size of a straw/pipe to stop a liquid running out of it when closing one end of it?
When I put a finger on a straw with water in it, it wouldn't fall out of this straw. But is there maximum size (length and diameter) of this straw/pipe to get this effect and what causes this limit?
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