What type of flow pattern would be associated with a forced-convection finned-coil heat exchanger such as an air-cooled hydraulic oil cooler?

Correct Answer: Option D — Cross flow

Cross flow occurs when the two fluids move at right angles to each other. In a forced-convection finned-coil cooler, the hydraulic oil flows through the tubes while air is blown across the external fins. This configuration maximizes heat transfer surface area and efficiency in compact marine auxiliary machinery applications.