Re: Buoyancy on a submerged block on bottom of tank

From: Edward Green (spamspamspam3_at_netzero.com)
Date: 02/11/05 

Date: 10 Feb 2005 16:10:06 -0800

Gregory L. Hansen wrote:

> Edward's flapper valve is a brilliant example.

Blush.

> The valve floats, except
> when it's closed and the tank is filled the weight of water keeps it
down
> and sealed. The flapper valve itself is a brilliant but seldom
> appreciated peice of engineering-- so much functionality in a single
> peice of rubber with a hinge. It's hard to make things look easy.

Of course, I made it look a little two easy. If the valve were merely
at the bottom of the tank, the dynamic force of water rushing out of
the hole would presumably overwhelm the buoyancy and the valve would
reseat too soon. To prevent this seems to be the function of a barrier
surrounding the outlet, which meters the outflow and allows the valve
to float on the resulting free surface inside the barrier and near the
bottom of the tank.

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