强化管表面结构对竖管降膜流动特性的影响

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强化管表面结构对竖管降膜流动特性的影响

更新时间：2025-07-09

- 强化管表面结构对竖管降膜流动特性的影响
- Issue 4, Pages: 53-60(2020)
- 作者机构：
  
  大连理工大学建设工程学部
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK172
- Published：2020
- 稿件说明：
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[J]. 2020, (4): 53-60.
DOI：

[J]. 2020, (4): 53-60. DOI：

摘要

为了研究强化管表面结构对竖管降膜流动特性的影响

搭建了竖管降膜流动冷态实验台

利用光谱共焦位移传感器和高速摄像仪对强化管和光管进行了对比研究。实验中

降膜流量通过调节高位水箱内静液柱高度H和布液器环隙间距Δd控制

使降膜雷诺数Re在0～4 500变化。测试结果表明:当02 000时

强化管的液膜厚度逐渐高于光管

且随着Re的增大

二者差值越趋增大;相对于光管

强化管润湿管壁的最小流量约为光管的1/3

明显小于光管

表明强化管有利于液膜的铺展;当降膜流动处于层流时

在入口段强化管与光管的降膜波动特性无明显差别

但光管较先进入充分发展区

随后波动强度逐渐小于强化管;当降膜流动呈湍流时

强化管的波动强度明显高于光管

当Re达到4 200时

在测试范围内强化管的平均波动强度较光管高出约8%

说明强化管的表面结构增强了液膜的扰动

更利于降膜蒸发过程传热传质。以上结论可为强化管用于竖管降膜蒸发器的研究提供有益参考。

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references

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