Experimental study on droplet flow pattern of horizontal tube falling film flow with low Reynolds number

LIU Shanlin; MU Xingsen; SHEN Shengqiang; LIANG Bin; BAO Tianjie; NI Bing

doi:10.11949/0438-1157.20190658

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Experimental study on droplet flow pattern of horizontal tube falling film flow with low Reynolds number

Fluid dynamics and transport phenomena | 更新时间：2026-07-24

- Experimental study on droplet flow pattern of horizontal tube falling film flow with low Reynolds number
- CIESC Journal Vol. 70, Issue 12, Pages: 4565-4574(2019)
- 作者机构：
  
  辽宁省海水淡化重点实验室，大连理工大学能源与动力学院，辽宁大连 116024
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20190658
  CLC： TK 124;TQ 025
- Received：12 June 2019，
  
  Revised：2019-09-21，
  
  Online First：09 June 2020，
  
  Published：05 December 2019
- 稿件说明：
移动端阅览
柳山林, 牟兴森, 沈胜强, 梁斌, 包天杰, 倪兵. 低Reynolds数下水平管降膜滴状流动的实验研究[J]. 化工学报, 2019, 70(12): 4565-4574

LIU Shanlin, MU Xingsen, SHEN Shengqiang, LIANG Bin, BAO Tianjie, NI Bing. Experimental study on droplet flow pattern of horizontal tube falling film flow with low Reynolds number[J]. CIESC Journal, 2019, 70(12): 4565-4574
柳山林, 牟兴森, 沈胜强, 梁斌, 包天杰, 倪兵. 低Reynolds数下水平管降膜滴状流动的实验研究[J]. 化工学报, 2019, 70(12): 4565-4574 DOI： 10.11949/0438-1157.20190658.

LIU Shanlin, MU Xingsen, SHEN Shengqiang, LIANG Bin, BAO Tianjie, NI Bing. Experimental study on droplet flow pattern of horizontal tube falling film flow with low Reynolds number[J]. CIESC Journal, 2019, 70(12): 4565-4574 DOI： 10.11949/0438-1157.20190658.

摘要

为了充分了解水平管降膜滴状流动现象，以水为实验流体，采用高速高清摄像仪对不同管距下水平管降膜滴状流动进行了可视化的实验研究。实验观察了低Reynolds数

≤200、管间距

≤40 mm 范围内的管间滴状流动过程。根据流动形态的特征，将滴状流动划分为堆积滴状流、不完全滴状流、吊坠滴状流、完全滴状流和不完全回缩滴状流。依据实验结果，绘制了滴状流动形态分区图。提出了分离长度的概念，并讨论了流量对分离长度的影响。研究了低Reynolds数下液滴流动的滴落点间距与流量的关系。结果表明，滴状流的管间流动形态不仅受流量的影响，同时也受管间距的影响。分离长度随着

的增大呈两段式线性增大。液滴流动的滴落点间距在

≤100范围内随

增大而减小，在100

≤200范围内趋于平稳。此外，分别建立了分离长度和滴落点间距与

的关系式。

Abstract

To fully understand the drop-like flow phenomenon of the horizontal tube falling film

this paper uses water as the experimental fluid

and uses a high-speed high-definition camera to visualize the drop-shaped flow of the horizontal tube under different pipe spacings. The droplet flow in low Reynolds number

≤200 and tube spacing

≤40 mm is observed. Based on the different flow characteristic

the droplet flow can be divided into accumulation droplet flow

incomplete droplet flow

pendant droplet flow

complete droplet flow and incomplete retracting droplet flow. According to the experimental results

the partition map of droplet flow is presented. The concept of separation length is proposed

and the effect of flow rate on separation length is discussed. The relationship between dropping site spacing and flow rate in droplet flow at low Reynolds number was studied. The results show that the flow pattern of droplet flow is influenced not only by flow rate but also by tube spacing. With the increase of tube spacing in

≤120

the flow patterns between tubes are converted from accumulation droplet flow to incomplete droplet flow to

pendant droplet flow

and to complete droplet flow. When 25 mm≤

≤40 mm

as the flow rate increases

the flow patterns are successively converted from incomplete droplet flow to pendant droplet flow

and to incomplete retracting droplet flow. The separation length increases linearly in two stages with the increase of

. The growth rate in

≤60 is smaller than it in 60

≤140. The correlation of separation length with

is established in this paper. In addition

the dropping site spacing of droplet flow is investigated. The dropping site spacing decreases with the increase of flow rate in

≤100

and remains stable in the range of 100

≤200. Meanwhile

the dropping site spacing of droplet flow with

is established.

关键词

Keywords

references

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