Falling film flow pattern transition of ionic liquid aqueous solution on horizontal tube bundles

IF 2.8 2区工程技术 Q2 ENGINEERING, MECHANICAL

Experimental Thermal and Fluid Science Pub Date : 2025-04-02 DOI:10.1016/j.expthermflusci.2025.111490

Fangfang Zhang , Shuyan Che , Hao Yin , Xiangyu Li , Chuangyao Zhao

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引用次数: 0

Abstract

The 1-ethyl-3-methylimidazolium acetate ([EMIm]Ac) ionic liquid aqueous solution is a promising absorbent used in absorption refrigeration technology. In this paper, the falling film flow pattern transition of the [EMIm]Ac ionic liquid aqueous solution was experimentally studied. The findings reveal that the critical Reynolds number for flow pattern transitions rises with increases in tube spacing, inlet liquid temperature, and circulating liquid temperature. In comparison to deionized water, the ionic liquid aqueous solution exhibits much smaller critical Reynolds numbers, and provides a more stable liquid film, and produces much smoother and clearer interfaces between liquid and gas. Additionally, hysteresis in flow pattern transitions is observed, and it generally increases with increasing tube spacing, inlet liquid temperature, and circulating liquid temperature. Criteria for flow pattern transitions are developed, and flow pattern maps are constructed for conditions with increasing and decreasing film flow rates, respectively.

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离子液体水溶液在水平管束上的降膜流型转变

1-乙基-3-甲基咪唑醋酸盐（[EMIm]Ac）离子液体水溶液是一种很有前途的吸收式制冷吸收剂。本文对[EMIm]Ac离子液体水溶液降膜流型转变进行了实验研究。结果表明：流动型转变的临界雷诺数随管距、进口液温和循环液温的增大而增大；与去离子水相比，离子液体水溶液具有更小的临界雷诺数，提供更稳定的液膜，并产生更光滑、更清晰的液气界面。此外，流型转换过程中存在滞后性，滞后性一般随管距、进口液温和循环液温的增大而增大。建立了流型转换判据，并分别建立了增大和减小膜流量条件下的流型图。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Experimental Thermal and Fluid Science 工程技术-工程：机械

CiteScore

6.70

自引率

3.10%

发文量

159

审稿时长

34 days

期刊介绍： Experimental Thermal and Fluid Science provides a forum for research emphasizing experimental work that enhances fundamental understanding of heat transfer, thermodynamics, and fluid mechanics. In addition to the principal areas of research, the journal covers research results in related fields, including combined heat and mass transfer, flows with phase transition, micro- and nano-scale systems, multiphase flow, combustion, radiative transfer, porous media, cryogenics, turbulence, and novel experimental techniques.