Capillary Definition and 103 Threads

How is B more correct than D? Both show that forces between glass and fluid are stronger than those between fluid molecules. Thank you for any insight!

Greetings PFers. I'm designing an experiment that needs to take elemental selenium gas at 500K at 120 PSI to a liquid form at any temp and pressure. I would like to use capillary tubes in conjunction with a pump to convert the gas to a liquid. However, I'm having difficulty finding...

Homework Statement Homework Equations The Attempt at a Solution Honestly, I don't have any idea on this. As far as I remember, the usual practice is to equate the excess pressure equal to ##2T/R## (where T is the surface tension and R is the radius of curvature, this may be wrong...

Homework Statement Given the following information, derive and expression to calculate the capillary depression of mercury in a glass tube given that: Contact angle = 140 degrees Surface tension 'Gamma' = 0.476 Nm^-1 Tube diameter = 1.0mm Density of mercury 'rho' = 13.58x10^3 kgm^-3...

Homework Statement So for an experiment, we injected a small volume of fluid into a capillary (76 micrometer diameter) through a pressure difference and I'm trying to calculate exactly how much was injected. diameter of capillary = 76e-6 m height one end was raised above the other = 5.334 cm...

Hello all. This is my first post and I wasn't exactly sure where to put it, so I apologize if it could be in a better place. Ok... here is my issue. I am currently enrolled in a Surfaces/Interfaces course. Capillary action eludes me. I do not understand WHY capillary action occurs in...

Assume that I have capillary of radius 0.08 cm. I want to test this capillary for capillary rise action. Formula will be T=hrgρ/2cosθ what will be the rise for water.. ( please tell me the calculated value) And, what will be the fall in mercury. ( How to show it negative as its...

Hey, I need to know the effect ( capillary rise) due to different materials on capillary action. Also, what is the reason behind it, not so complex, just in simple language. It will be more good if I'll get the practical and calculated values of height in capillary tube of different...

Why does water, in a small glass tube,open at both sides(for example) not flow out if we put it in vertical position and put our finger on the top?(we close it)?

As the question states I have hard time understanding that how does a liquid reach equilibrium in case of capillary depression (mercury for example ). I know how it goes down but not how it 'stops'. like in case of liquids which have more force of adhesion ,as the liquid goes up because of...

As the title states, can anyone help me understand what the difference between the two is? I've been trying to look everywhere but nothing really explains why they're different. I just thought it would be the same. This is based on the capillary rise method for surface tension.

http://en.wikipedia.org/wiki/Surface_Tension Could someone help me solve the capillary rise method equation, with a worked example: y= hpgr/2 Thank you soo much

Say I have a single capillary that can raise water to height H. If I split the capillary to make another meniscus, say δ distance from the top, and both branches are of the same radius as before, will I be able to bring water up higher (i.e. could I add another H-δ high column of water to the...

Homework Statement Trough a capillary with an inner radius r=1mm water flows in a form of small spherical droplets. What is the radius of the drops, the number of drops in m=10g water and the time needed the water to expire, if the surface tension of the water is =72x10^-3N/m, and the period...

We all think that by increasing the temp of a liquid, the surface tension would reduce and so capillary rise will not be as high. But on increasing the temp, the liquid's density also decreases and so the weight of liquid to be lifted also reduces. Which will have the dominating effect, decrease...

Considering very thin capillaries, such as found in wood to transport water (~100Micron), I understand that the two main factors in play are gravity and the adhesive forces between the water and the surface of the capillary tube. I understand that gravity is proportional to volume that is...

Hey guys, I am a little confused with the concept of Capillary actions with specific regards to paper towels. I understand the mechanics behind a single capillary tube and the height that water reaches in relation to surface tension. However, my professor claims that paper towels absorb as...

This question struck me when i was watching a liquid rise in a capillary tube. I'm curious to know from where the energy gets transferred to the liquid to rise above the surface. Well, one possible explanation that i can think of is air pressure. Though, it can be a possible reason only if the...

Homework Statement Hey folks, here is a question: A thread of mercury of length 15cm is used to trap some air in a capillary tube with uniform cross-sectional area and closed at one end. With the tube vertical and the open end uppermost, the length of the trapped air collumn is 20cm...

Does the water approach the maximum height in a capillary tube with 0 velocity?I mean to say that does it go to the maximum height and just stop or perform simple harmonic motion ?Water is in equilibrium but velocity need not be 0 or is it(why?).The expression we derive for h should be for...

the height upto which liquid rises in capillary tube is 2S cosθ / ρgR I need a derivation for this - please I know that a combination of adhesive force , surface tension and weight creates the contact angle θ but how to proceed after that? To calculate height h i need to know the force by...

Hey folks, here is a question: A thread of mercury of length 15cm is used to trap some air in a capillary tube with uniform cross-sectional area and closed at one end. With the tube vertical and the open end uppermost, the length of the trapped air collumn is 20cm. Calculate the length of the...

I know there have been a number of posts relating to capillary action but after reading through them I cannot find an obvious answer to my query. Although capillary action can be used to explain the properties of 'wicking' materials that can raise water vertically I am unsure as to whether it is...

We were presented with a task of calculating the temperature of absolute zero experimentally. To do this, we were given a capillary tube with one end sealed. Then we heated the tube up in a bunsen burner and quickly put the open end in some cooking oil. The oil was sucked up as the gas within...

Homework Statement It is known that water in a capillary will rise to a certain height, as shown in the figure. Comparing the points P and Q, which point exhibit larger pressure? a. P b. Q c. The pressure of P and Q are the same Homework Equations F_upward=2*pi*R*T*cos⁡θ W=pi*R^2*...

Homework Statement so i have an to do an EEI for an assignment due this friday. My experiment involves me putting a rounded bowl with a flat bottom and a hole in the center on the bottom onto some still water and testing how the bowl sinks faster as weight is added to the bowl. The water comes...

I know that the law of conservation of energy is not violated by either complete destructive interference or capillary action, but I'm curious then what happens to the energy and where it comes from in these cases, since I can't figure it out. Consider the case of complete destructive...

what will happen to capillary rise effect if we take capillary to space g=0?

Suppose we have a very small V shaped tube-like vessel that is closed at the bottom (see attached picture). Question 1: If a drop of liquid enters the vessel from the top, what determines the stopping point of the drop (i.e. at what point is the force of gravity countered and the drop...

hello :) Homework Statement (Q)A 20 cm long capillary tube is dipped in water.The water rises up to 8 cm . If the entire arrangement is put in a freely falling elevator, the length of water column in the capillary tube will be <a>8 cm <b>6 cm <c>10 cm <d>20 cm Homework Equations...

heya :D Homework Statement (Q)Water rises in a vertical capillary tube upto a length of 10 cm. If the tube is inclined at 45 degrees, the length of water risen in the tube will be <a>10 cm <b>10/(2)1/2 <c>10(2)1/2 <d>None of these Homework Equations Height raised in capillary, h =...

Ok, let's say you have a short cylinder (about a quarter inch tall and a three inch diameter) now take that cylinder and make one half of the circle hydrophilic and the other half hydrophobic (not the top one way and the bottom the other, I am talking about half the circle like how you would cut...

Hey guys, I have a problem in one of my classes where I need to make an equation of capillary rise in a strip of paper towel. I am given data points and I need to make an equation that fits the points. Can someone please help me through the physics and derivation behind this. I tried doing some...

I thought I understood capillary action, but according to my understanding, non-polar substances shouldn't undergo capillary action. Today in lab, we were working with ether, which is non-polar, and I noticed it climbed up a paper towel. It was slower than water, but still... what intermolecular...

Will there be any difference in capillary rise if the capillary tube is sealed at one end? What is the value of pressure at a point in the capillary tube on the same horizontal level as that of liquid outside? - Is it equal to the atmospheric pressure + the height of liquid column above it?

Homework Statement A glass capillary sealed at the upper end is of length 0.11m and internal diameter 2 x 10^-5 m. The tube is immersed vertically into a liquid of surface tension 5.06 x 10^-2 N/m. To what length has the capillary to be immersed so that the liquid level inside and outside...

I'm not too sure if this is the right board, but it seems the most apt, so here it goes: Question 1: If a column of water rises due to capillary action, its centre of mass must rise too, so where does the energy come from? Question 2: Regarding the origin of capillary action; most...

Hi I have a question about the capillary force between two hydrophilic surfaces. I am working with small cantilevers (5-50 um long, 5 um wide, 200 nm thick). If L represents the lever, which is hydrophilic, and X represents some bulk material (also hydrophilic), a profile of the lever looks...

Hello everyone, In fenestrated capillary there are holes inside the endothelial cell, I don't understand how cells can have holes? Does this mean that individual holes in endothelial cells are covered by a lipid membrane? Can anyone tell how can there be holes in an individual cells when...

we vacate a cannister using a vacuum pump using a range from 200-900 mbar of vaccum. Will the flow rate remain constant as the vacuum decreases over 24 hrs or does it tail off at a given pressure, a capillary of diameter 0.102mm is used ?

Hello. I've had this idea floating around in my head for a long time and lately it's really been bugging me. Say you had a tray of water, and suspended another tray above that, and then you connected the two trays vertically with some very thin tubes, say, 0.2mm in diameter. Now, due to...

Hello guys, A capillary is made up of a single layer of endothelial cells right. So when blood cells pass through it, do the endothelial cells take blood cells up by endocytosis and then release it to other side. How do capillaries take up nutrients, do the endothelial cells take it up...

Homework Statement A capillary is dipped in water vessel kept on a freely falling lift, then a)water will not rise in the tube b)water will rise to the maximum possible height of the tube Homework Equations W=2\pir S cos\theta or h=(2S cos \theta)/(r\rhog) The Attempt at a...

This is fairly amateur but I'm not an engineer so: If you have a drop of water on a table and you stick a straw in it some of the water goes up the straw until gravitational force equals the capillary force. Am I right in saying, (generally): 1) If you have a small drop of water hanging from...

Is it possible to simulate capillary effects in a channel using femlab (exclude the newest version)? I mean the new version has wetted wall boundary condition setting, which can set the wall adhesion and the contact angle between the air/liquid interface and the wall. But the older version...

I tried posting a similar question before, however, I've found the 1 reply is actually wrong. Hopefully with better illustrations, someone will know. The situation in the picture is a drop of water entering a capillary tube. It is located here...

Hi, I have questions regarding capillary action and capillary depression for practical purposes. I'm fairly educated in physics and chemistry, but have some "what would happen if..." questions. Please help, and add any information you'd think helpful! 1) Imagine you have your typical...

Hey everybody I'm looking to buy a set of these: http://www.sciencelab.com/page/S/PVAR/10615/10-2410 the 5mm OD tubes that become malleable when subjected to heat (for a little project I want to do). Unfortunately, this website does not ship to Canada. Anyone know of any brick & mortar...

Homework Statement (see figure) Three forms of capillaries are given, and the question is simple : which of these are physically possible? There are no data given (such as densities or dimensions of the capillaries), so it is just the form that is of importance here. The three cases...

if gravitation is present, will there be a capillary rise of liquid in vaccume?