Abstract
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.
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The project is supported by National Natural Science Foundation of China (51606029).
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Qu, Z., Ma, Z., Zhang, J. (2020). Experimental Study on the Influence of Uniformity Liquid Distribution on the Flow Pattern Conversion of Horizontal Tube. In: Wang, Z., Zhu, Y., Wang, F., Wang, P., Shen, C., Liu, J. (eds) Proceedings of the 11th International Symposium on Heating, Ventilation and Air Conditioning (ISHVAC 2019). ISHVAC 2019. Environmental Science and Engineering(). Springer, Singapore. https://doi.org/10.1007/978-981-13-9524-6_5
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DOI: https://doi.org/10.1007/978-981-13-9524-6_5
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