Abstract
Column flow is one major flow mode in horizontal-tube falling-film evaporator. In this study, a horizontal-tube falling-film flow experiment platform is built up. A high-speed camera is used to shoot the process of falling and break of liquid column at the bottom of horizontal tube. Image edges are detected using the algorithm based on Sobel to quantify the liquid column features. Liquid column break process, falling velocity, variation pattern of break shape and break length, as well as the special phenomenon encountered in column falling process are discussed in detail. Results show that the break of liquid column undergoes three stages. The liquid column break shape has a periodic variation pattern, and the liquid column break length fluctuates within a certain interval. In addition, as the spray increases, break length increases, and the fluctuation interval of break length expands. The liquid falls downward spirally and its velocity rises in waves with time, and there exists an obvious uniform phase. In spray density range of 0.03–0.05 kg/m⋅s, liquid column falling velocity increases and the uniform phase is delayed as the spray increases. But when spray density varies in 0.05–0.06 kg/m⋅s, no significant increase in liquid falling velocity can be found.
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