圆管和扁形管的绕管式换热器壳侧流体降膜流动特性

石油炼制与化工 ›› 2024, Vol. 55 ›› Issue (9): 62-69.

圆管和扁形管的绕管式换热器壳侧流体降膜流动特性

薄守石,桑文蓉,徐子涵,孙兰义,郝兆龙

中国石油大学（华东）重质油全国重点实验室

收稿日期:2023-12-20 修回日期:2024-03-28 出版日期:2024-09-12 发布日期:2024-08-28
通讯作者: 薄守石 E-mail:shoushibo@hotmail.com

CHARACTERISTICS OF FALLING FILM FLOW ON SHELL SIDE OF TUBE-WOUND HEAT EXCHANGERS WITH ROUND AND FLAT TUBES

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Received:2023-12-20 Revised:2024-03-28 Online:2024-09-12 Published:2024-08-28

摘要/Abstract

摘要： 为探究异型管绕管式换热器壳侧流体降膜流动和分布特性，建立了绕管式换热器三维物理模型，并基于流体体积（VOF）法多相流模型进行了数值模拟，对比分析了圆管和扁形管的管外流体降膜流动特性。结果表明：圆管和扁形管的管外轴向降膜流动分布均呈现“波谷-波峰-波谷”形状；扁形管的管外流体降膜流动速度明显大于圆管；圆管的管外液膜最薄处为圆周角120°处，扁形管的管外液膜最薄处在90°~120°之间；随着管间距的增加，圆管和扁形管的管外液膜平均厚度均呈下降趋势，扁形管周向液膜平均厚度比等周长圆管小10%~29%；随着缠绕角的增加，扁形管的管周向液膜平均厚度比等周长圆管小4%~28%。因此，推荐使用扁形管替代圆管作为绕管式换热器的缠绕管。

关键词: 绕管式换热器, 圆管, 扁形管, 液膜厚度, 数值模拟, 流体体积法

Abstract: In order to investigate the characteristics of falling film flow on the shell side of a special-shaped tube-wound heat exchanger, a three-dimensional physical model of the tube-wound heat exchanger was established, the multi-phase flow model based on the volume of fluid (VOF) method was numerically simulated, and the characteristics of falling film flow outside the tube of circular tube and flat tube were compared and analyzed. The results showed that the axial distribution of the falling film flow outside of the round tube and the flat tube showed the shape of "trough-peak-trough", and the falling film flow velocity of the flat tube was obviously higher than that of the round tube. The thinnest part of the outer liquid film of the round tube was at 120° of the circumferential angle of the round tube, and the thinnest part of the outer liquid film of the flat tube was at 90°- 120°. With the increase of pipe spacing, the average liquid film thickness of the round tube and the flat tube showed a downward trend, and the circumferential average film thickness of the flat tube was 10%-29% thinner than that of the circumferential average film thickness of the equal circumference of the round tube. With the increase of the winding angle, the circumferential average film thickness of the flat tube was 4%-28% thinner than that of the circumferential average film thickness of the circumferential round tube. Therefore, it is recommended to use the flat tube instead of the round tube as the winding tube of the winding tube of the tubular heat exchanger.

Key words: spiral wounded heat exchanger, round tube, flat tube, liquid film thickness, numerical simulation, VOF model

薄守石桑文蓉徐子涵孙兰义郝兆龙. 圆管和扁形管的绕管式换热器壳侧流体降膜流动特性[J]. 石油炼制与化工, 2024, 55(9): 62-69.

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