I think you have to specify what kind of radiators are normally suited for which application. The flat tube and serpentine fin design was our configuration of choice for the Black Ice due to its high internal surface area, conductivity, and dimensional compression.
Oil coolers are designed to tackle the viscosity of the intended medium.
Folks in the HVAC industry have other radiator types which they use, like round tube force-fitted across flat fins and heated to expand. This suits chilled water flowing through them as cooling coils.
Similar configurations using thicker-walled copper capillary tubes are reserved for use in vaporphase applications.
Charge air coolers (intercoolers) are designed to be air-to-air heat exchangers to cool down compressed air.
billbartuska, we can have say the Black Ice Xtreme radiator in one configuration (specified fin density, specific louvre geometry, tube type etc.) and will perform better given a specific set of paramaters such as right amount of airflow or perform worse say given a very constricting waterblock with an inadequate pump.
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