[Amps] FW: RE: Liquid Cooling Systems

[Gary Schafer]

Well, it sounds good but they left out a few things.
It would seem that if the surface tension is less with this product that 
  would make turbulent flow become less. With less turbulent flow there 
is less heat transfer.

With laminar flow (low turbulence) there is a layer of water near the 
surface that insulates the rest of the water from the surface. Less heat 
transfer with laminar flow than there is with turbulent flow. You don't 
particularly want a super smooth surface for best cooling as there will 
be less turbulence.

The hot spots that develop on the cylinder walls that cause cavitation 
can only be decreased by a higher boiling point in the coolant.

While the "water wetter" may lower the overall coolant temperature they 
  do not address what happens to the hot spots. They suggest raising the 
cooling system pressure. That tells you that the hot spots are still a 
problem. If left unchecked the cavitation will bore a hole in the 
cylinder wall.

73
Gary  K4FMX

Will Matney wrote:
> Rich,
> 
> I finally found Water Wetter on the manufacturers website last nite and read about it. Keep in mind this company makes lubricants. It said that water wetter reduces the surface tension of the water where it meets the hot surfaces and reduces the size of any bubbles. This gives more area of contact for the water to whatevers being cooled. Their tests showed about a 10 deg. F drop from 210 Deg. F using straight water if I recall the test correctly. They also explained that running a 50%/50% water glycol mix cut the cooling ability by X2. This water wetter dropped that mix 20 deg. F from 220 deg. F. My guess is that its some sort of really thin oil or a synthetic which acts like a soap. You can mix soap with bug spray when spraying plants to reduce surface tension and make the bug spray stick to the plant.
> 
> Best,
> 
> Will
> 
> *********** REPLY SEPARATOR  ***********
> 
> On 3/11/05 at 5:57 AM R. Measures wrote:
> 
> 
>>On Mar 10, 2005, at 8:27 PM, Will Matney wrote:
>>
>>
>>>Joe,
>>>
>>>Correct, they make those copper blocks now to water cool aluminum heat 
>>>sinks. I think there's about 2-3 heatsink manufacturers making them 
>>>now, Thermalloy being one. This brings up several electronic items, 
>>>tube and transistor amps plus super cooling voltage regulator 
>>>assemblies. The water wetter sounds like a good idea and I'm curious 
>>>myself what's in it to increase the heat transfer.
>>
>>Also, if "Water Wetter" turns out to be electrically conductive, it may 
>>not be wonderful for an anode coolant.
>>
>>>Best,
>>>
>>>Will
>>>
>>>*********** REPLY SEPARATOR  ***********
>>>
>>>On 3/10/05 at 10:55 PM Joe Subich, K4IK wrote:
>>>
>>>
>>>>Will writes:
>>>>
>>>>>Personally, I dont see anything wrong with the posts as they
>>>>>pertain directly to water cooled tubes. If some addative can
>>>>>be used to cool a tube better, this is an amp forum, and it
>>>>>should be discussed. This especially if the addative can
>>>>>prolong the life of a very expensive tube.
>>>>
>>>>Neither do I see a problem.  Fact is, by this time next year
>>>>I expect to see a water cooled solid state amplifier available
>>>>at Dayton.  There should be some 120 - 200 volt transistors
>>>>available at a reasonable price per watt by then the problem
>>>>will be keeping them cool with a typical heatsink/fan.  A
>>>>water cooled substrate (copper block) with a small closed loop
>>>>system would make for a very nice package.
>>>>
>>>>I hope we see some 1500 Watt (CW) output 100% duty cycle solid
>>>>state amps (4 transistors) at reasonable prices (competitive
>>>>with the Ameritron, TenTec, Commander, etc.) within the next
>>>>two or three years.
>>>>
>>>>73,
>>>>
>>>>  ... Joe, K4IK
>>>>
>>>>
>>>>
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>>>
>>>
>>>
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>>>
>>
>>Richard L. Measures, AG6K, 805.386.3734.  www.somis.org
>>
>>
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