Study on the Horizontal Tube Falling-Film Thickness Under Cross Airflow
The liquid film thickness distribution is one of the most important parameters to charac-terize the flow characteristics outside the horizontal tube.The axial and circumferential film thickness distributions under column flow mode are measured using the air-water system and the conductance probe method,and the effect of the cross airflow is analyzed.The results show that the circumfer-ential film thickness at the wave crest decreases and then increases with increasing circumferential angle,and a minimum value occurs within the circumferential angle of 100°～120°.The axial film thickness has a wave crest region and is symmetric distributed in the quiescent surroundings.When the cross airflow exists,the circumferential film thickness on the windward surface increases in the circumferential angle of 30°～90° and decreases in the circumferential angle of 90°～150°,while those on the leeward surface becomes more uniform.The axial wave crest region and spreading region of the liquid film on the windward surface also increase,but those on the leeward surface change little.
cross airflowhorizontal tubefilling film flowfilm thickness distribution
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