A computer-based hot-film technique for two-phase flow measurements

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Abstract
This paper describes the development of a novel computer-based hot-film anemometer measurement technique for the investigation of the local structure of two-phase flows. The technique enables the total signal to be separated into the parts corresponding to bubbles and continuous phase, from which the local volume fraction can be evaluated. Evaluation procedures are also presented for analysing the remainder of the signal corresponding to the turbulent continuous phase after eliminating the bubble signals. Methods are described and discussed for the evaluation of the longitudinal mean velocity, normal stress, autocorrelation and energy spectrum. Finally typical results for a vertical up-flow of a bubbly kerosene/water mixture are presented.