Mechanism of initial droplet formation in dropwise condensation

刘天庆 穆春丰 夏松柏 孙相彧

您当前的位置：

首页 >

文章列表页 >

Mechanism of initial droplet formation in dropwise condensation

更新时间：2025-12-10

- Mechanism of initial droplet formation in dropwise condensation
- CIESC Journal Issue 4, (2007)
- 作者机构：
  
  大连理工大学化工学院化学工程系
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Online First：05 April 2007，
  
  Published：05 April 2007
- 稿件说明：
移动端阅览
刘天庆穆春丰夏松柏孙相彧. Mechanism of initial droplet formation in dropwise condensation[J]. CIESC Journal, 2007, (4).
DOI：

刘天庆穆春丰夏松柏孙相彧. Mechanism of initial droplet formation in dropwise condensation[J]. CIESC Journal, 2007, (4). DOI：

摘要

滴状冷凝初始液滴形成机理一直是悬而未决的问题。鉴于镁能与热水（冷凝液）反应，反应后镁表面的化学成分将发生变化，采用金属镁作为冷凝表面，在实验中通过控制过冷度和冷凝时间而实现蒸汽在镁表面的初始冷凝。然后应用电子探针（EPMA）技术分析冷凝前后试件表面化学成分的变化，用于推断蒸汽的初始冷凝状态。实验结果表明，镁表面氧元素的含量随着过冷度和冷凝时间增加而明显增加，并且氧元素在镁表面的分布是不均匀的。这些结果说明在固体表面上发生初始冷凝时凝液是成核状态的，而不是成膜状态。因此，滴状冷凝初始液滴形成机理符合成核中心假说。

Abstract

The mechanism of the formation of initial condensate droplets for dropwise condensation is still not clear. Magnesium was used as condensation surface in this study since it can react with hot water (condensate) and thus make the chemical composition of the surface changed. In the experiments

the initial condensation of steam on the magnesium surface was achieved in the designed apparatus by controlling subcooling and condensation time. Then

the test surface was scanned with an electron probe microanalyzer (EPMA) for the variation of the chemical composition of the surface before and after the initial condensation

which can be used to deduce the state of the initially formed condensate

whether in nuclei or in thin film. The results showed that the oxygen contents on the test surface increased with subcooling and condensation time obviously after initial condensation. And the oxygen on the test surface was not distributed uniformly. It indicated that the initial condensate was formed in nuclei on the solid surface

but not in thin film. Therefore

the mechanism of the formation initial condensate droplets for dropwise condensation accords with the hypothesis of surface nucleation sites.

关键词

Keywords

references

Views

480

下载量

CSCD

Alert me when the article has been cited

提交

Tools

Publicity Resources

Recent advances and perspectives on sulfide-based photocatalysts for hydrogen production

New universal corresponding state equation for correlation and extrapolation of saturated vapor-liquid density

Study on the residence time distribution characteristics of the TPMS-Diamond static mixer

Advantages and risks of swirling cooling granulation towers

Physics-informed spatio-temporal graph convolutional network for fermentation processes

Related Author

No data

Related Institution

No data

⁰