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Abstract
The flow and heat transfer characteristics for three-dimensional mixed convection flows in a radiator flat tube with U-shaped grooves are analyzed numerically. The flow and temperature fields are calculated using the developed program that is a modified SIMPLE algorithm for irregular geometry. One tube specification among the various flat tube exchangers is recommended by first considering the heat transfer and pressure drop. The effects of variation of coolant flow conditions and external air conditions on the flow and the thermal characteristics for the selected tube are investigated also. The results will be used as fundamental data for tube design by suggesting optimal specifications for radiator tubes.