Can a Magnetic Ferrofluid Valve Float Foam Balls in a Container?

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Discussion Overview

The discussion revolves around the feasibility of using a magnetic ferrofluid valve to allow foam balls to float within a container of ferrofluid. Participants explore the mechanics of such a valve, its design, and alternative methods for achieving the same effect.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant proposes a valve design using neodymium magnets to prevent ferrofluid leakage while allowing foam balls to enter the fluid.
  • Another participant questions the practicality of the valve, noting that even a perfect valve would require displacing fluid to allow the foam ball to float.
  • A suggestion is made to consider using two different density liquids instead of ferrofluid, allowing the foam ball to float at the interface between them.
  • Further inquiry is raised about the necessity of using ferrofluid, proposing the idea of layering a lighter fluid on top of the ferrofluid to facilitate the floating of foam balls.

Areas of Agreement / Disagreement

Participants express differing views on the necessity and practicality of using ferrofluid versus alternative methods. There is no consensus on the effectiveness of the proposed valve design or the best approach to achieve the desired outcome.

Contextual Notes

Some assumptions regarding fluid dynamics and the behavior of ferrofluid in relation to buoyancy and surface tension remain unaddressed. The discussion does not resolve the technical challenges associated with the proposed designs.

Who May Find This Useful

Individuals interested in fluid dynamics, engineering design, and experimental physics may find the exploration of these concepts relevant to their work or studies.

MrSponge
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Hi,

I was wanting to insert 1 inch foam balls inside a container of ferrofluid, causing the foam ball to float.

A normal one-way water valve would not let the ball through without any leakage (I believe), therefore I think that If i can build a valvue that consists of a ring of neodynium magnets with the pole that repulzes the ferrofluid pointing towards the centre with the attractive pole hidden. Fitted at an angle pointing towards the ferroufluid and away from the feed tube of foam balls.

I believe that this valve with just over 1 inch in diametre would be sufficient enought to allow the foam ball through ( and break surface tension) and to be absorbed into the liquid which will then float up. Without allowing ferrofliud to flow into the feed pipe.

Thankyou and I hope this is clear
 
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Application?
... even if you had a perfect valve, you still have to push the ball into the fluid because you have to displace some fluid mass that would otherwise occupy the ball's immersed position.

What you describe appears to be a variation of this:
http://www.lhup.edu/~dsimanek/museum/unwork.htm#buoy4
 
Last edited:
MrSponge said:
Hi,

I was wanting to insert 1 inch foam balls inside a container of ferrofluid, causing the foam ball to float.

A normal one-way water valve would not let the ball through without any leakage (I believe), therefore I think that If i can build a valvue that consists of a ring of neodynium magnets with the pole that repulzes the ferrofluid pointing towards the centre with the attractive pole hidden. Fitted at an angle pointing towards the ferroufluid and away from the feed tube of foam balls.

I believe that this valve with just over 1 inch in diametre would be sufficient enought to allow the foam ball through ( and break surface tension) and to be absorbed into the liquid which will then float up. Without allowing ferrofliud to flow into the feed pipe.

Thankyou and I hope this is clear

Can you describe the application? Do you need to use ferrofluid? Or can you just use two different density liquids, and let the foam ball float up through the interface between them? If you need to use ferrofluid for some reason, can you just put a lighter fluid layer on top of it, and let the foam balls float up through the boundary between them?
 
@berkman - the first link in post #2 shows you the application.
I'll edit it to be clearer - thanks.

Also see this related idea which was to use water.
 

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