Numerical simulation on heat transfer enhancement inside internally longitudinal protuberant finned tube under pulsating flow

The turbulent pulsating flow and heat transfer in an internally longitudinal protuberant finned tube was numerically investigated by solving unsteady three-dimensional elliptical Navier-Stokes equations. The realized k-ε turbulent model was adopted. The dynamic behaviors of velocity flied, average Nusselt number and friction number of the internally longitudinal protuberant finned tube were numerically analyzed in a pulsating period, and it was further investigated by changing the frequency of the pulsating flow. It was found that the intensity of heat transfer enhancement increases with increase of pulsating frequency, while the pressure drop will be increased simultaneously, the intensification of heat transfer in internally longitudinal protuberant finned tube are gradually better than pressure drop with increase of pulsating frequency.