What would be cooler, a steel plate with a fire on one side with 10 gallons
per hour of water flowing over it or 15 gallons of water per hour flowing
over it?  Perhaps that is over simplified .....

Yes. I think it is. Its a long time since I studied thermodynamics, but I'm
sure that the amount of turbulence, the speed of the boundry layer, that
sort of thing make a big difference.
I would think that it IS possible to speed up the water flow and thus reduce
the cooling.
John Slade

Jeff has some handles on this. Hopefully he will comment when he gets
back from vacation.

Paul Lamar

If the flow area were the same then the 1.5x flow would remove more heat
because:
1) Heat transfer coefficient would be higher due to higher velocity
2) Average temperature of cooling water would be lower due to higher mass
flow per unit time.

Whether or not these effect were measurable would depend on how well the
cooling system was operating already.  If the "fire" was cool or not being
effectively transferred to the plate and the plate was already "cool" using
1x flow then 1.5x flow would make "no difference".  If the 1x flow was
about to boil then the 1.5x flow would make "a huge difference"

Jeff Spitzer

 
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