Experimental Study on the Influence of Uniformity Liquid Distribution on the Flow Pattern Conversion of Horizontal Tube
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This paper experimentally studied the effect of non-uniform liquid distribution on the evolution of the falling film flow mode transition on an array of horizontal tubes. A dedicated experimental bench was designed and built to observe the falling film flow pattern. A smooth copper tube with an outer diameter of 19.05 mm, a tube length of 280 mm, and a tube spacing of 10 mm was selected as the test tube. The experimental results showed that the law of the flow pattern evolution under the non-uniform liquid distribution condition is significantly different from that under the uniform liquid distribution condition: When the mass flow of water gradually increases, the transitional Re of the droplet to droplet-column flow pattern conversion is 5.93% lower than that under uniform liquid distribution condition, the transitional Re of the droplet-column to column flow pattern conversion is 55.7% higher than that under uniform liquid distribution condition, the transitional Re of the column to column-sheet flow pattern conversion is 12.4% higher than that under uniform liquid distribution condition, and the transitional Re of column-sheet to sheet flow pattern conversion is 26.2% higher than that under uniform liquid distribution condition. This paper provides a reference for establishing a more accurate condensation heat transfer model of horizontal tube bundle.
KeywordsLiquid distributor Horizontal tube Flow mode Falling film Reynolds number
The project is supported by National Natural Science Foundation of China (51606029).
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