B307 DEVELOPMENT OF STEAM GENERATOR USING FALLING FILMS ON HEAT TRANSFER TUBES(Multiphase Flow-2)

概要

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A steam generator apparatus was designed employing a method of vaporization that uses falling films on heat transfer tubes, thereby rendering the size of the generator to become more compact. Surface-worked copper tubes were selected for high evaporation performance. The tubes were set in a steam generator having a layout of three lines and twenty layers. An electric heater was equipped in each of the heat transfer tubes as the heat source. The water flow rate for falling films was set appropriately. As a result of the experiment, it was found that the heat transmission coefficient of this method was larger under the condition of low heat flux. However, deterioration of the heat transmission coefficient was observed under the condition of high heat flux. Accordingly, an experiment of vaporization by pool boiling was carried out using the same heat transfer tubes under the high heat flux condition. From these experimental results, the size of the steam generator was determined.
2009-11-16