corrosion of alloy radiators?

[oldcorollas]

here is a rough diagram of heat loss, in kW/m^2 versus temperature



again really roughly, for an air to air heat exchanger, the heat transfer coefficient for convection might be something like 25.0 W/m2K, but for water to air, where one side is conduction, it will be higher..

[eeeyan]

i think you've gone above and beyond the details needed for the alloy radiators question fella's

I admire your detail but its toymods. Not NASA.

come up for air will ya's

[oldcorollas]

?? this is all simple stuff here eeeyan but agreed it has little to do with corrosion
this is also a tech forum, where meatheads and bogans are supposed to be confused

but no-one seems to know abotu the corrosion stuff, and most info in the "media" is either wrong or misguided.....

[eeeyan]

Someone once told me freshly extracted alumina has next to no radiant heat so you could walk up to a pile of VERY hot freshly extracted alumina and the first indication its hot would be your boots melting and you could put your hand next to it and feel no heat even though its very hot... i think its a load.. how can something be VERY hot and not give off radiant heat? Maybe this is one for you oldrollas..

Now enjoy that i know you can find a graph for it.

PS. Dont call me a meathead haha jokes

[oldcorollas]

alumina is low heat capacity, and low conductivity, but high emissivity. you can work it out

[trdee]

pretty much all the heat transferred across an intercooler would be from forced convection (ie, air moving through the intercooler fins). radiation is a very small loss in comparison, at least till you get up to the point where shit is hot enough to glow

to put it in a simple way, what feels hotter? one of those gay arse glowing light heaters or a fan forced heater? usually the fan forced heater... because forced convection provides better heat transfer

also

Would not emissivity create hot air currents and help to draw heat away from the coated object when there is little or no moving air around, or through, for instance the intercooler fins?

you're thinking of natural convection

edit; as usual, i may be missing something (seeing as its just off the top of my head), but i think im fairly right on this

[3sgte]

so what is different between stock alloy rads and aftermarket.. just the alloy end tanks instead of plastic?

oh and dodgy alloy used for the cores perhaps?

Not sure, but I am definitely happy with my current one!
(11 years old and as clean/corrosion free as can be)