Drexel dragonThe Math ForumDonate to the Math Forum



Search All of the Math Forum:

Views expressed in these public forums are not endorsed by Drexel University or The Math Forum.


Math Forum » Discussions » sci.math.* » sci.math

Topic: honeycombs
Replies: 9   Last Post: Jan 24, 2013 5:40 PM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
Rich Delaney

Posts: 361
Registered: 12/13/04
Re: honeycombs
Posted: Jan 23, 2013 5:22 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

On Jan 21, Martin Brown <|||newspam...@nezumi.demon.co.uk> wrote:
> > I saw a news item about a new technique to draw CO2 from
> > the atmosphere.  It's a chemical process, using amines,
> > which binds with the molecule, coated on a large structure,
> > in the shape of a honeycomb.

>
> > According to the story, this maximizes surface area.
> > ok, mathematicians, which function gets optimized by a
> > honeycomb?  What are the constraints and assumptions?

>
> 2D problem to *minimise* the surface area to occupy a given volume. Bees
> use it to make honeycomb with the least amount of wax.
>
> It is not difficult to show that the angle between sides must be 120
> degrees and that equal lengths minimise total length/area occupied.
>
> They have the structure just about as wrong as it is possible to be
> unless the stuff they are making it out of is extremely precious.


?

> The 3D problem to occupy volume with a foam of minimum surface area is
> far more interesting and gives rise to Plateau's laws of soap films. The
> Kelvin foam structure was optimal until fairly recently when
> Weare-Phelan discovered a 3% better solution using a pair of shapes. A
> whole new family has been found but as yet a proof of optimality eludes.


The claim is that honeycomb maximizes surface area
(of what?). This is new to me, so I'm looking for a
rigorous statement of the problem, and proof of the solution.


--
Rich



Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© Drexel University 1994-2014. All Rights Reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.