Heat transfer enhancement mechanism of transverse direction type serrated fin in turbulent flow based on field synergy principle

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 uniform; periodic longitudinal vortex was formed because of the fin strong disturbance; the synergy of velocity field and temperature gradient was improved owing to vortex enhancing the heat transfer efficiency and improving integrated heat transfer performance factor.