The heat transfer and flow characteristics of TD (transverse direction) type serrated fin in plate-fin heat exchanger were studied numerically. To explore the heat transfer enhancement mechanism of TD type serrated fin

three dimensional numerical model was established to examine the temperature gradient field

velocity field and fields synergy in turbulence flow. Furthermore the effect of fin height

fin space and fin width on the heat transfer and flow characteristics were analyzed respectively. The integrated heat transfer performance factor were calculated. Results show that: the temperature field and velocity distribution was uniformperiodic longitudinal vortex was formed because of the fin strong disturbancethe synergy of velocity field and temperature gradient was improved owing to vortex enhancing the heat transfer efficiency and improving integrated heat transfer performance factor.