| lets compare a double pass to a single pass made from the same core. The coolant flow cross section of the single pass is twice that of the double pass with the same overall core volume. Flow velocity is roughly inversely proportional to cross section given constant flowrate. So although the flow length through the radiator is doubled, the cross section is halved, which results is a CONSTANT residence time. I.E. Twice the distance at twice the speed takes just as long. The benefit I see is that increased flow velocity increases turbulance thus increasing the coefficient of convection. In terms of overall heat flow balance, this will increase the total heat flux. However, because of the naturally low thermal resistance at this interface, the principle of diminishing returns comes into play. Overall, it should provide a benefit of unknown magnitude, over your single pass design given that the doubled flow resistance doesn't cause a drop in coolant flow by adding additional resistance to the water pump action. The water pump IS afterall a centifugal pump, and as such is subject to mass flow variations based on pressure drops just like our turbos. This effect can easily outweigh the benefit of increased convection. Only advanced modeling or simple testing can show the true operating characteristics.
 
Daily driving a TT is like ordering your favorite pizza for breakfast lunch and dinner. It's not healthy and eventually you will lose the magic of the meal. Sometimes you just have to have some meatloaf. My new meatloaf.... 1994 Black Honda Civic DX :D what? It looks a little stumpy, but fits great in the hand! (n/m) - ZEngineer 12/12/06 |
