Multiple capillary

[HANSCHETI]

i have read somewhere that capillary action have limit of around 32 feet due to atmospheric pressure i may be wrong.

 

But what if we use multiple capillary to runs small turbine like in image

 

how viable will it be for running small light in a house

[studiot]

I wonder if the person who gave the -1 point (undeserved IMHO) to a new member who appears to be trying hard can actually state why the above proposed arrangement will not work?

 

Hanscheti,

 

Firstly thank you for taking note of my request not to blur the text +1

 

You have attempted to show a siphon but clearly don't understand the basics so I really suggest you take a basic physics course if you wish to emulate the achievements of your great countryman Bose.

 

A syphon will only work if the outlet is below the inlet so trying to raise water with one will not work in the manner you have shown.

 

Once again I urge you to study some basic physics before trying what we call a wild goose chase for a perpetual motion machine you will not find one.

 

https://www.youtube.com/watch?v=CZmP0vsRBZ8

Edited January 9, 2015 by studiot

[Strange]

I wonder if the person who gave the -1 point (undeserved IMHO) to a new member who appears to be trying hard can actually state why the above proposed arrangement will not work?

 

It might work with superfluid helium...

[studiot]

 

It might work with superfluid helium...

 

 

So elaborate?

 

The OP mentions 32 feet, which implies water to me and therefore temperatures between 0^o and 100^oC.

 

Adding polyethylene oxide provides an interesting diversion, but the outlet is still below the inlet.

 

https://www.youtube.com/watch?v=s_3DP3QYqos

 

[Strange]

 

So elaborate?

 

 

http://en.wikipedia.org/wiki/Superfluidity

 

(Actually, it wouldn't work because the helium would climb over the sides of each funnel as well as through the tubes.)

 

I rarely link to YouTube, but you can see it in action here:

[studiot]

Sorry, I should have mentioned before.

 

The diagram in post#1 shows an attempt at a siphon, which works due to external (to the fluid) pressure difference.

 

Capillary action works due to (internal) fluid surface tension.

[John Cuthber]

I'm fairly sure (given the thread title) that the opening post isn't a representation of a syphon in the traditional sense.

The whole point is that the outlet is above the input.

I think the idea is that the liquid will be drawn up the tube by capillary action, and then drip out of the tube into the next "funnel".

With a few funnels you would be able to get enough head to drive a turbine.

 

Unfortunately, it won't work.

The simple reason for saying that is that it would be a breach of the conservation of energy.

The detailed reason is that, if the liquid "wets" the material of the tube well enough that it rises in the tube, then it will stick well enough that it won't drip from the end of the tube.

[studiot]

 

I'm fairly sure (given the thread title) that the opening post isn't a representation of a syphon in the traditional sense.

The whole point is that the outlet is above the input.

I think the idea is that the liquid will be drawn up the tube by capillary action, and then drip out of the tube into the next "funnel".

With a few funnels you would be able to get enough head to drive a turbine.

 

 

So why the first line of post#1?

[Strange]

i have read somewhere that capillary action have limit of around 32 feet due to atmospheric pressure i may be wrong.

 

That is certainly true of lifting water by using air pressure (sucking it up a tube, for example). Capillary action complicates things. For example, trees are obviously able to lift water hundreds of feet. But this is a complicated process with many factors involved.

http://www.scientificamerican.com/article/how-do-large-trees-such-a/

[John Cuthber]

 

 

So why the first line of post#1?

That line is "i have read somewhere that capillary action have limit of around 32 feet due to atmospheric pressure i may be wrong."

 

I have underlined part of it.

[studiot]

One difference between siphonic and other air pressure base devices and capillary action is that air pressure devices are independent of the bore of the pipe.

 

Capillary devices become progressively less efficient as the pipe bore increases, until they don't work at all.

Of course the smaller the bore the smaller the flow.

Edited January 9, 2015 by studiot

[John Cuthber]

One difference between siponic and other air pressure base devices and capillary action is that air pressure devices are independent of the bore of the pipe.

 

Capillary devices become progressively less efficient as the pipe bore increases, until they don't work at all.

Of course the smaller the bore the smaller the flow.

The flow will be zero.

[Endy0816]

At the top, what would cause the water to come out of the capillary tube?

[John Cuthber]

At the top, what would cause the water to come out of the capillary tube?

Gravity.

Exactly the same gravity that wasn't strong enough to stop the liquid rising in the tube would need to magically be strong enough to overcome exactly the same attraction.

That's why it doesn't work.

[studiot]

 

endy

At the top, what would cause the water to come out of the capillary tube?

 

 

I have been investigating this because capillary water in plants does ooze out if you cut them.

 

I think the answer is evaporation.

 

The water evaporates at the free surface, drawing more water up behind it.

 

But note that the capillary pathways in plants are esentially very small bore.

So either the quantity transprted is small or there are a great many pathways as in a large tree.

[ALex7JA]

You'd need a pressure machine.