Re: Change of radiator core affecting cooling performance in 1949, 23rd series

Posted by Joe D'Agostino On 2017/7/10 15:12:15

I found a good reference on the effect of flow rate in the radiator:


What about laminar flow vs turbulent flow? When the flow rate slows down in the radiator, we may not have turbulent flow which reduces the thermal transfer. This is what a lot of the web sites that I am reading are saying. That flow rate in the radiator is more important than the time that the fluid remains there even if the temperature drop across the radiator is not as great.


The effect of heat transfer increases as the flow of coolant changes from laminar flow to turbulent flow. For laminar flow, heat can be transferred only by means of heat conduction from layer to layer. However, in turbulent flow, the mass transfer in the radial direction enables the heat to be transferred by both conduction and convection. As a result, the efficiency increases dramatically. The diagram below illustrates this concept.

Google "pressure drop across radiator affects cooling"http://www.dc.engr.scu.edu/cmdoc/dg_doc/develop/design/cooling/31000005.htm