Without using silver? Put something in the water that has a near neutral to slightly negative bouyancy. A small piece of paper well soaked?
Ode
At 12:41 AM 12/2/2003 -0600, you wrote:
>>>>
What do you use to observe the stirring? I mean, do you put a glass on the heat source and add something to the water so you could see the stirring effect? I have actually seen the effect with flakes of silver in the water when I didnt wipe the electrodes and let it run for about 3 hours. Looked neat. I just wondered what method you used to observe cause I get asked how I know its working all the time and I would like to show those who inquire without having to use silver.<<<<
Jeff
-----Original Message-----
From: Ode Coyote [mailto:coyote...@earthlink.net]
Sent: Sunday, November 30, 2003 8:08 AM
To: silver-list@eskimo.com
Subject: Re: CS>Why the yellow CS - an hypothesis
Yes
With a hot spot in the center bottom, heat rises fast in the center as it is shed along the outside perifery which makes the cooler liquid sink, further reinforcing the central updraft.
Going the other way with liquid cooling [vs heating], you get pretty much the same central updraft as the cool liquid on the outside edges sinks, forcing warmer liquid up through the center and back around to the outside top.
Preheating and allowing to cool works pretty well for stirring, but tends to peter out as the container gets cool too fast.
Both directions ..hot to cool or cool to hot..give the same thermal torrid in the same direction.
So, if it seems that heat is gaining too much, Let it cool and you still get a thermal stir effect.
It's not heat itself that does the job, it's the thermal differential, or difference in heat.
Which also means that a cool room adds to the effect.
Ode
At 11:25 AM 11/29/2003 -0500, you wrote:
>>>>
It makes sense that a glass
lid on top of a thermally mixed
vessel would produce a
better CS.
In a cylindrical vessel heated
at its lower end, the steady-state
convection will be an updraft
vertically along the center axial
region, and a downdraft along
the periphery of the cylinder
except for cooling losses at
the top surface. A glass lid will
diminish the latter loss, thereby
increasing the convection
down the inside periphery of
the vessel. The result is more
stirring without additional heating.
Best wishes,
Matthew
<<<<
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