EXPERIMENT STUDY ON THE BOILING HEAT TRANSFER OF LIQUID FILM IN A ROTATING PIPE

An experimental facility is developed to investigate the characteristics of the nucleate boiling heat transfer in a rotating water film.The High speed photography technique is used to visualize the flow field of the rotating water film.Along with the bubble photographs, the centrifugal acceleration, heat flux into the film, and the heat transfer coefficient are calculated to learn the heat transfer characteristics of the water film.It is found that the boiling heat transfer coefficient decreases with the increment of heat flux.The heat transfer coefficient increases with acceleration increasing from 20g to 60g, but show no obvious increase from 60g to 120g.