satanicoo:
Heater cores, to my knowledge, do not use turbulators. The need for turbulators in greatest in oil cooling applications, where the oil's high viscosity readily results in laminar flow conditions.
With regards to your second question, the presence or absence of turbulators should make little difference at any flow rate, relative to the overall design of the radiator. Flow restriction, analogous to resistance in electrical circuits, is mostly a function of length times the inverse of the cross sectional area. This is, for example, why 1-pass radiators usually have less head loss than 2-pass radiators of equivalent size: the 1-pass radiator has twice as many parallel tubes/plates (more cross sectional area), and the total length of each parallel segment is about half as long (less total length). The overall contribution of turbulators to pressure drop is probably quite small, but that's something only a fluid engineer or radiator designer can answer for sure.
pelle76:
Your first pic is an evaporator from the car's A/C.
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