The geometry structure is taken from amplified real tube-fin heat exchanger,and the angle of attack of vortex generator is 45°.

To improve the heat transfer performance of finned tube heat exchanger,according to the field synergy principle(under the condition of same speed and the temperature boundaries,convective heat transfer is decided by synergy between the fluid speed field and heats field),utilizes the oval tube instead of the circle one.

Frosting problem of finned tube heat exchangers;