You are absolutely correct in what you say about stirrer size. I was
aware of the issue but others may not be. I am just considering some DC
gearhead motors at All Electronics surplus and wanted to get one that
was in the ballpark range, cheaper than a fish tank filter motor and
better suited than the muffin fan commonly used.
I will adjust stirrer size and final motor speed as needed.
Thanks for the reminder though.
Steve N
-----Original Message-----
From: [email protected] [mailto:[email protected]]
Sent: Friday, January 30, 2009 8:03 AM
To: [email protected]
Subject: Re: CS>Magnetic Stirrer RPM
Ode, The size of the stirrer in comparison with the surface of the
vessel, influences the amount of mass stirred and the turnover. When
defining magnetic stirrer's speeds, one should also include the the size
of the stirrer. for instance a 1/2 " magnet creates little turnover at
100 rpm. The same rpm with a 2" stirrer may spill the liquid.
Best regards
Frank
Ode Coyote wrote:
>
>
> Any speed that reduces sparklies and grey beard build up on the
> pressure side of the water currents on round electrodes, or eddy side
> where pressure turns a corner on flat ones.
>
> 10-40 RPM works well. 100 might.
>
> Ode
>
> At 04:04 PM 1/29/2009 -0600, you wrote:
>
>> What is a good RPM rate or range for a CS magnetic stirrer?
>> - Steve N
>>
>>
>> No virus found in this incoming message.
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>> Version: 7.5.552 / Virus Database: 270.10.15/1923 - Release Date:
>> 1/29/2009
>
>
>
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