Study on fluctuation feature and breakdown characteristic of water film on the wall of corrugated plate

Abstract

Corrugated plate dryer is a very important steam-water separation equipment for nuclear engineering. And heat and mass transfer phenomenon is commonly observed in the separation process. It is meaningful to study the flow, fluctuation and breakdown characteristics of the water film on corrugated plate wall. Water film thickness of steady flow is measured based on plane laser induced fluorescence (PLIF) technique and time series of water film thickness are obtained. Besides, amplitude and frequency domain information of water film fluctuations are analyzed by the power spectral density (PSD) method. A two-dimensional model of water film breakdown is established. A model of the relative position of the liquid film rupture is established. Critical airflow velocity when the water film breakdown is measured experimentally. Based on theoretical results, equations for calculating critical airflow velocity of the corrugated plate under different water film thicknesses are fitted in the form of nike function. Fitting equations for calculating critical airflow velocity in the form of nike function agree well with experimental results. The relative position of water film breakdown is merely affected by the water film Reynolds number and the structure parameters of the corrugated plate.