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Field synergy analysis of different flow patterns in falling-film dehumidification system with horizontal pipes

水平管降膜除湿系统中不同流态的场协同性分析

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Abstract

Effects of the flow pattern of intertubular liquid film on mass and heat transfer synergies in a falling-film dehumidification system with horizontal pipes are studied. A flow model of the dehumidifying solution between horizontal pipes is established using Fluent software, the rule of transitions of the flow pattern between pipes is studied, critical Reynolds numbers of flow pattern transitions are obtained, and the accuracy of the model is verified by experiments. The mass transfer synergy angle and heat transfer synergy angle are respectively used as evaluation criteria for the mass transfer synergy and heat transfer synergy, and distribution laws of the synergy angles for droplet, droplet columnar and curtain flow patterns are obtained. Simulation results show that the mass transfer synergy angles corresponding to droplet, droplet columnar and curtain flow patterns all rise to a plateau with time. The mean mass-transfer synergy angle is 98° for the droplet flow pattern, higher than 96.5° for the droplet columnar flow pattern and 95° for the curtain flow pattern. The results show that the mass transfer synergy of the droplet flow pattern is better than that of the droplet columnar flow pattern and that of the curtain flow pattern.

摘要

本文研究了水平管降膜除湿系统中管间液膜的流动方式对传质与传热协同性的影响。利用Fluent 软件建立了水平管间除湿溶液的流动模型,研究了管间溶液流型的过渡规律,得到了流型过渡的临界 雷诺数,并通过实验验证了模型的正确性。分别以传质协同角和传热协同角作为传质协同性和传热协 同性的评价标准,得到了滴状、滴柱状和帘状流态的协同角分布规律。结果表明,液滴、滴柱状和帘 状流态的传质协同角随着时间的延长均趋于稳定。液滴流态的平均传质协同角为 98°,滴柱状流态的 平均传质协同角为 96.5°,帘状流态的平均传质协同角为 95°。滴状流态的传质协同作用优于滴柱状流 态和帘状流态。

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Correspondence to Run-ping Niu  (牛润萍).

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Foundation item: Project(2016YFC0700100) supported by the National Key R&D Program of China; Project(JDJQ20160103) supported by the Promotion of the Connotation Development Quota Project of Colleges and Universities-Outstanding Youth of Architectural University, China

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Niu, Rp., Kuang, Dq., Wang, Sz. et al. Field synergy analysis of different flow patterns in falling-film dehumidification system with horizontal pipes. J. Cent. South Univ. 27, 2353–2366 (2020). https://doi.org/10.1007/s11771-020-4454-3

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  • DOI: https://doi.org/10.1007/s11771-020-4454-3

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