Re: [Amps] more - oil bath GS-35b

[Tom Thompson <w0ivj@tomthompson.com>]

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@contesting.com] On Behalf Of Steve
> > Wright
> > Sent: Sunday, March 29, 2015 11:21 PM
> > To: amps@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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