Skip to main content

Questions tagged [surface-tension]

Surface tension occurs due to the tendency of liquid molecules to favor their own kind. Surface tension is important in fluid multiphase systems typically at small length and velocity

Filter by
Sorted by
Tagged with
0 votes
0 answers
19 views

Pressure inside a bubble/drop of water due to surface tension

I was studying problems in capillary action in fluid mechanics and I have a fundamental doubt. Is the excess pressure inside a bubble/spherical fluid body caused by surface tension, the same all ...
Toshiv's user avatar
  • 17
-1 votes
2 answers
103 views

Why rain drops are spherical while water droplets on a glass surface are flat?

Why are raindrops spherical when falling through the air, but lose their spherical shape when they are on a flat surface?
Helix Nebula's user avatar
0 votes
1 answer
45 views

Question about Young-Laplace equation proof

I was studying a proof of the Young-Laplace equation, but I came across a dubt in the very begin. Here the initial part of the proof: Consider an interface separating two immiscible fluids that are ...
fede1602's user avatar
1 vote
0 answers
53 views

How to calculate pressure necessary to push air bubble out of capillary [closed]

An air bubble is kept by surface tension at the bottom of a capillary. The capillary is sealed at the bottom, where the air bubble sits. How to calculate the pressure necessary to push the air bubble ...
spat's user avatar
  • 11
1 vote
1 answer
58 views

What would happen to a soap bubble if there were no surface tension?

Suppose you have a soap bubble. Now, suppose that the surface tension in the liquid film that surrounds the bubble disappears instantly. What would happen to the bubble? Also, is it possible to form a ...
russell.price's user avatar
2 votes
1 answer
41 views

Why does a bubble created in the body of a liquid pop when it rises to the surface?

Suppose you have a glass of water and you blow bubbles in the water using a straw. The bubbles pop when they rise to the surface of water. Why does this happen? Does the surface tension of water play ...
russell.price's user avatar
5 votes
0 answers
121 views

How do bubbles on water surface merge?

When we open a tap over a water surface, we get to see a lot of bubbles ("half merged in the water") coming out on the surface. Now what I saw was that two such nearby half bubbles merge to ...
Ankit's user avatar
  • 8,220
12 votes
4 answers
4k views

How does a snake climb the wall?

Consider a snake climbing up the wall or ant climbing up the wall, which force is responsible for it? An obvious answer is frictional force but my question is that if there is a normal reaction ...
Kampann's user avatar
  • 151
1 vote
0 answers
20 views

Surfactant diffusion with Fick's 2nd law

Normally, the dynamic surface excess from fresh surface in aqueous surfactant solution is given by Ward-Tordai equation $$ \begin{align*} \Gamma(t) &= \sqrt{\frac{D}{\pi}} (2c_b \sqrt{t}-\int_0^t \...
Nam Nguyen's user avatar
1 vote
0 answers
25 views

Best mesh design for a tea strainer [closed]

I'm currently designing a closed tea strainer / egg made of stainless steel and testing a prototype made of polycarbonate plastic. The problem I'm facing likely has to do with the capillary effect - ...
Andrew Jackson's user avatar
0 votes
0 answers
16 views

Surface Tension vs. Gravity: Finding the Critical Length Scale

I'm studying Kardar's "Statistical mechanics of particles" book and tackled a problem. After solving it, I checked Kardar's solution and found that he has different approach. I'm interested ...
MaxL's user avatar
  • 31
0 votes
1 answer
37 views

Regarding angle of contact and capillary tube of insufficient length

It is written in my book that when a capillary tube is of insufficient length, the liquid does not overflow and the shape of the liquid meniscus changes, but the angle of contact remains the same. I ...
Shaurya Gupta's user avatar
1 vote
1 answer
24 views

Question on fluid jet profile in the limit of zero surface tension

While reading on the Plateau Rayleigh instability of fluid jets, the following thought came to my mind: suppose we have a fluid jet with zero cohesion forces (and therefore zero surface tension) ...
user2554's user avatar
  • 455
0 votes
0 answers
28 views

Is there an intrinsic energy-momentum associated with constraining forces that don't do work?

As an example, consider a continuous charge distribution, within Maxwell's model of classical electrodynamics, that is brought from infinity onto a spherical surface at a radius $r$ from the origin. ...
Physiks lover's user avatar
6 votes
1 answer
108 views

How does a bubble pop?

I was looking at some old slow motion videos showing a phenomenon where a bubble is popped by firing a sphere (or pea) through it. One obvious thing that happens is that the pea does not pop the ...
Tom's user avatar
  • 1,410
0 votes
0 answers
19 views

Soap film retraction dynamics

Let’s say you have a planar soap film, which thickness increases linearly. If you burst it, the film will retrace and the retracing speed will decrease. How exactly does the velocity of bursting ...
Dunja's user avatar
  • 1
1 vote
1 answer
115 views

Surface tension versus stress in a balloon's membrane

I am conducting an experiment in which I am measuring how the internal pressure in a balloon varies with its circumference. To explain the relationship (shown in the graph below) I decided to ...
Patil's user avatar
  • 305
12 votes
4 answers
3k views

How does pressure exist inside a drop of water?

Consider pressure inside a drop of water. I have seen a formula for it where $$\text{Pressure Inside}=\text{Pressure Outside}+2\frac{S}{R}.$$ I want to know how pressure exists inside the liquid. Is ...
Fhami's user avatar
  • 121
0 votes
2 answers
136 views

Why does curvature reduce the inward attractive force of molecules?

This question concerns the first 2 paragraphs of this text. I am struggling to visualize why molecules on the flat surface experience more net inward force than those on a curved surface. If we have 2 ...
Michael Munta's user avatar
0 votes
1 answer
99 views

Measuring the tension of a drumhead

I'm working on an experiment to see how the tension of a drumhead impacts the frequency of its sound, but I'm not sure as to how I could measure this. I found this forum thread from 2012, which ...
lopmon's user avatar
  • 1
4 votes
4 answers
2k views

How are curved soap films stable?

How do curved soap films remain in equilibrium, if surface tension tries to pull them taut? What I understand: Surface tension acts tangentially on a surface. The potential is energy is proportional ...
magneticMono_Poal247's user avatar
0 votes
1 answer
30 views

Surface Tension On The Surfaces which are not exposed to Environment

In the picture Below, I was asked to Calculate the force due to surface tension on the left side of the water about an imaginary square ABCD by the right side of water. ($T$ = surface Tenson) One has ...
Tirth Patel's user avatar
0 votes
3 answers
92 views

Can a soap film be expanded infinitely?

Consider a rectangular wire frame with a sliding wire of length l. When the frame is dipped in soap solution, a soap film is formed over it. Assume that there is no friction between the arms and the ...
NotAScientist's user avatar
11 votes
5 answers
3k views

In physics, when should one use and not use calculus?

Assume that a drop of liquid evaporates by decrease in its surface energy, so that its temperature remains unchanged. What should be the minimum radius of the drop for this to be possible? The surface ...
Dumb person 's user avatar
3 votes
3 answers
231 views

Why does surface tension increase on addition of soluble impurities?

I read that addition of soluble impurities increase the surface tension of water. I initially thought it was because when soluble impurities dissolve in water it leads to the dissociation of that ...
Aaron Nelson's user avatar
1 vote
2 answers
199 views

Why do hot water droplets persist in cooler water?

I notice this phenomenon typically when mixing hot or warm water with cold water. Basically, tiny droplets of hot water travel inside the body of cooler water and persist. I have included a photo of ...
hedgepig's user avatar
-1 votes
2 answers
82 views

Liquid Vapour Surface Tension Interaction with Solid

In my book there's an experiment to calculate the value of surface tension in which a solid of certain weight is kept on the surface of a liquid and it remains in equilibrium . Now the book states ...
PinkAura's user avatar
  • 349
10 votes
2 answers
486 views

Could a fish swim out of a sphere of water in a zero-gravity environment?

Can a fish swim out of a sphere of water in a zero-gravity environment? I am going to state some assumptions. We assume the sphere of water is not affected by any thermal properties of its zero-...
Jonathan L.'s user avatar
0 votes
0 answers
18 views

Marangoni effect and surface tension gradients in binary liquid

I have a question regarding the understanding of the Marangoni effect. A simple visualization is the deposition of a drop of soap (some surfactant-laden solution) into pure water. Because the soap ...
M. Hennes's user avatar
0 votes
1 answer
29 views

Same needle shows Hydrophobic and hydrophilic behaviour just by changing orientation or position (from surface to bulk)

If I penetrate water's surface with needle (using hand) then Cohesive forces> Adhesive forces and water molecules climb up the needle (exactly like capillary action) and needle behaves ...
Faraz Ahmed's user avatar
0 votes
0 answers
35 views

Shape of a static capillary surface

I am studying the effects of surface tension and in particular the shape of a capillary interface in hydrostatic condition. Let's recall the Young-Laplace Equation $ \Delta P = \sigma \bigg(\frac{1}{...
leo95nf's user avatar
1 vote
0 answers
46 views

Homemade Du Nüoy ring?

I am helping my daughter work on her science project. She wants to test the surface tension of various solutions. I bought a cheap tensiometer off of Amazon and now I need the Du Nüoy ring to attach ...
Vaccano's user avatar
  • 131
3 votes
1 answer
868 views

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 ...
Bml's user avatar
  • 439
18 votes
4 answers
5k views

Why do water particles appear to be exiting a stream of water from a faucet, instead of the stream being held together by surface tension?

I recently noticed an interesting phenomenon while watching the tap running in my kitchen. At the time, there was bright sunlight coming in the kitchen window. As the stream was running out of the tap ...
Michael Mcgarry's user avatar
8 votes
2 answers
795 views

How would the volume of a drop of water (from a dropper) on the Moon and other bodies compare to one on Earth? (indoors of course!)

Searching for "volume of a drop of water from an eyedropper", I ran across this answer on Quora: It depends on the size of the dispensing tip, but generally for a Pasteur pipette it is ...
uhoh's user avatar
  • 6,273
1 vote
0 answers
103 views

How are bubbles formed when a raindrop hits a flat pool of water?

I have noticed that raindrop impact can create a bubble on the surface of the water in a hot tub (104°F) up to several centimeters in diameter that is stable for several seconds before bursting. The ...
Stevan V. Saban's user avatar
0 votes
0 answers
6 views

How dose the surface area of a fiber change , when in situ surface modification is occured?

I in situ modified the surface of a fiber which is inside water to more hydrophobic. Density of fiber decreased. How I explain it using surface energy and tension?
Kavindu Lochana's user avatar
0 votes
0 answers
14 views

Context: Surface tension. Is the interface more dense than the bulk? [duplicate]

Considering, the phenomenon of surface tension, is the interface of the liquid more dense than the bulk phase? Considering, if it were more dense, the phenomenon of surface tension would be explained, ...
Quin Gardiner Bax's user avatar
0 votes
2 answers
40 views

Is the force of surface tension acting on a liquid mensicus in a capillary tube an internal force for the surface?

When we calculate the excess pressure on the concave side of the meniscus of the liquid surface formed in a capillary tube, we balance the force by the atmospheric pressure, force by the pressure on ...
Aditya Mukherjee's user avatar
0 votes
0 answers
258 views

Why is there excess pressure on the concave side of liquid meniscus in a capillary tube?

I understand the derivation for the expression of excess pressure inside a liquid drop, but, most books also use this concept of excess pressure for explaining the rise of liquid column inside a ...
Aditya Mukherjee's user avatar
1 vote
0 answers
37 views

Should we regard a capillary tube as a source of potential energy?

When a capillary tube is inserted into a large body of water, there is an increase in potential energy (PE) of the system. This is because the increase in PE of the rising water in the capillary is ...
Brian F's user avatar
  • 151
0 votes
1 answer
58 views

Contact Angle acid-base approach negative square root

I've collected Contact Angles for 3 different liquids (ethylene glycol, glycerol, and water) on a substrate. My aim is to use the acid-base approach (eq. below) to obtain the dispersion, acid, and ...
Double_you's user avatar
2 votes
1 answer
57 views

Why fibers go to the liquid/liquid interface instead of staying in the bulk phase?

I have an ionic liquid solution phase and an organic phase. They are immiscible. When I place a small piece of nylon fibre in the liquid it always goes to the liquid/liquid interface instead of ...
Kavindu Lochana's user avatar
1 vote
1 answer
99 views

Gravity vs adhesion of a water droplet

How much volume can a water droplet that is attached to a vertical glass surface have before it begins to roll downwards?
Andrew Jackson's user avatar
7 votes
2 answers
270 views

Breaking apart the surface tension of a water droplet

How far apart do two vertical glass surfaces have to stand for a water droplet that is sticking to both of them to break into two? I apologize in advance for the question possibly being too imprecise �...
Andrew Jackson's user avatar
0 votes
0 answers
28 views

What is the entropy variation when drying a wet surface with an absorbent cloth?

A mass of water on a surface is considered as a hydrostatic thermodynamic system. It seems reasonable to assume that the internal energy of this system $U(S,V,A)$ depends on the entropy, the volume ...
Davius's user avatar
  • 1,640
6 votes
1 answer
318 views

Why do dry lentils cluster around air bubbles?

When I pour dry lentils into a water bowl, I notice many of them form little clusters, with an air bubble in the center. Why does this happen? I'm guessing something about static electricity. But not ...
Juan Perez's user avatar
  • 2,982
1 vote
0 answers
10 views

Droplet Breakup model solely for charged droplets in electric field?

At the moment I am trying to simulate charged droplets and their berakup in an homogeneous electrical field in vacuum. I am using a VoF-Method, but as the droplets get smaller and smaller I would need ...
LukeHirl's user avatar
3 votes
1 answer
74 views

Why does water come out of a bottle in waves?

So imagine you have a bottle of water or any type of liquid (like a bottle of milk that has just been opened)that is completely full or even three quarter of it is full,why does the water or milk come ...
P B's user avatar
  • 31
1 vote
0 answers
66 views

Water Droplet on solid plate (Young's Equation via Force Analysis)

I was reading about Solid-Liquid-Air Interfaces pg 484 in Competitive Physics Volume 1 by Wang and Ricardo and we were proving Young's equation regarding the contact angle of the water droplet on this ...
Michael Li's user avatar

1
2 3 4 5
16