Thanx myv65, you replied all my questions.
To resume :
1 - static or ambient pressure plays no role in heat transfer. That means the order of pump, rad, block would be determined by local deltaT rather than local pressures.
2 - Higher flow produces better cooling.
3 - consider that we take care properly of other problems (air flow through rad, elements position, etc..)
Besides i'm considering building a custom radiator. Every small bit of valuable engineering info is welcome.
Moreover i've yet to see an efficient "low-flow" system. Yes money can be a consideration but i dont see any other interest. Given a fixed system, increasing the flow will always increase heat transfer (up to the point where the pumps dumps too much heat - in our situation it's not the case).
Sirpent: "myv65, is it true that as long as we think in terms of delta-Ts for the radiator and waterblock (ignoring frictions in the system), changing the flow rate does not make any difference in the cooling efficiency?"
i'm not sure of what you mean, but if you mean "heat tranfer" the Fourier formula Q=UAdeltaT answers it. Q=heat tranfer, A = contact area, U = heat coeffficient, which depends on such things as turbulence and flow. U will get higher if flow gets higher...
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