[Amps] more - oil bath GS-35b

[Tom Thompson]

The flow through the radiator has to be the same as the flow around the 
tube.  The secret is to spend more time in the radiator which has a 
larger surface area than the tube.

Tom   W0IVJ

On 3/31/2015 10:22 PM, Gary Schafer wrote:
> How is the radiator different from the tube? Heat transfer is about
> temperature difference, flow rate and turbulent flow. The greater
> temperature difference the faster the heat transfer.
>
> If you slow down the flow thru the radiator you at the same time slow it
> down at the tube.
>
> Faster flow increases turbulence and decreases heat layering giving better
> contact to the oil/metal surface. Slow flow allows layering of the heat in
> the oil which acts like an insulator as it flows slower near the metal
> surface. Faster flow causes more turbulence which breaks up the layering
> reducing the insulating action. Better heat transfer.
>
> See:Laminar flow.
>
> 73
> Gary K4FMX
>
>
>
>> -----Original Message-----
>> From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Steve
>> Wright
>> Sent: Sunday, March 29, 2015 11:21 PM
>> To: amps at contesting.com
>> Subject: Re: [Amps] more - oil bath GS-35b
>>
>>
>>
>> On 30/03/15 17:01, Gary Schafer wrote:
>>> You do not need to slow the flow down in order to pick up heat. The
>> faster
>>> the flow the more heat will be transferred.
>> Correct!  The faster the oil flow in the tube cooler, the better the
>> cooling.
>>
>> But not so for the radiator.  The oil must slow down and be in the
>> radiator for a finite time for the heat to be transferred from the oil
>> to the air.
>>
>>
>>
>>> On another note, you will need as much air movement to cool the
>> radiator as
>>> you would need to cool the tube directly. With oil cooling you are
>> only
>>> moving the heat from the tube to the radiator. You still have the same
>>> amount of heat to transfer to the air.
>> Sure.
>>
>>
>>> Although with the radiator the surface area to cool will be much
>> larger than
>>> it is with air cooling the tube so the air velocity can be lower.
>>>
>> Exactly!  Very much lower, and very very much quieter.  I want to sit
>> next to my quiet amp - not my vacuum cleaner.
>>
>>
>> Steve
>>
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