金属丝网超亲/疏水性强化气液相界面运动

doi:10.11949/j.issn.0438-1157.20151827

化工学报 ›› 2016, Vol. 67 ›› Issue (6): 2318-2324.DOI: 10.11949/j.issn.0438-1157.20151827

金属丝网超亲/疏水性强化气液相界面运动

陈宏霞^1,2, 马福民³, 黄林滨¹

1. 华北电力大学能源与动力工程学院, 北京 102206;
2. 多相流与传热北京市重点实验室, 北京 102206;
3. 湖北理工学院材料与冶金学院, 湖北黄石 435003

收稿日期:2015-12-03 修回日期:2016-01-29 出版日期:2016-06-05 发布日期:2016-06-05
通讯作者: 陈宏霞
基金资助:
国家自然科学基金项目(51576063,51202082)。

Super-wettability meshes enhance movement of gas-liquid interface

CHEN Hongxia^1,2, MA Fumin³, HUANG Linbin¹

1. School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China;
2. The Beijing Key Laboratory of Multi-phase Flow and Heat Transfer, North China Electric Power University, Beijing 102206, China;
3. School of Materials & Metallurgy, Hubei Polytechnic University, Huangshi 435003, Hubei, China

Received:2015-12-03 Revised:2016-01-29 Online:2016-06-05 Published:2016-06-05
Supported by:
supported by the National Natural Science Foundation of China (51576063, 51202082).

摘要/Abstract

摘要：

利用多孔结构进行液体的导流和气液分离是近年来强化传热的研究热点,主要原理是气液固三相界面的受力平衡,固相材料的亲疏水性则是决定微孔内气液固三相界面运动规律的关键因素。针对具有一定亲水性的金属铜网,进行超亲水和超疏水处理;考察多孔结构亲疏水性对相界面以及气液两相分离效果的影响。结果表明,金属铜网具有浸润自相容性;经过亲疏水表面改性后,超亲水性能阻挡气泡的通过;超疏水性能的多孔铜网更易与气体为伍,形成致密气封膜,阻挡液体进犯。静态实验测定多孔丝网的浸润自相容能力,接触角为151°丝网,对液相阻滞力为117.6N·m^-2;接触角为0°的超亲水丝网对气相阻滞力为49N·m^-2,并建立了多孔结构浸润自相容性与分离临界气泡尺寸的数学关联。

关键词: 两相流, 多孔膜, 浸润性, 相界面, 自相容性

Abstract:

Using the porous materials to guide and separate multi-phase flow became a leading edge topic. The mechanism is the force balance of three-phase interface, in which the wettability of substrate is the key factor. An adiabatic and visible experiment flat form was built to study the effect of wettability on the phase interface movement and the separation with a super-hydrophobic and a super-hydrophilic mesh. As the result, the super-hydrophobic and super-hydrophilic mesh showed the self-compatibility. With this ability the super-hydrophilic mesh can block bubbles from flowing through, while the super-hydrophobic mesh can hold a column of liquid by counteracting gravity. Base on the stagnant experiment the super-hydrophobic mesh with a contact angle of 151° showed a resistance of 117.6 N·m^-² to water, and the super-hydrophilic mesh (θ=0°) indicated a resistance of 49 N·m^-². During the two-phase flow experiment, the super-hydrophobic mesh showed an enhancement on separation of bubbles, while the super-hydrophilic mesh refused the penetration of bubbles with a layer of liquid film. A mathematic relation of self-compatibility of mesh and the critical diameter of separation was concluded. The modulation of wettability of porous mesh can promote the phases separating which will widen their applications on phase change heat transfer fields.

Key words: two-phase flow, porous film, wettability, phase interface, self-compatibility

中图分类号:

TK121

陈宏霞, 马福民, 黄林滨. 金属丝网超亲/疏水性强化气液相界面运动[J]. 化工学报, 2016, 67(6): 2318-2324.

CHEN Hongxia, MA Fumin, HUANG Linbin. Super-wettability meshes enhance movement of gas-liquid interface[J]. CIESC Journal, 2016, 67(6): 2318-2324.

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金属丝网超亲/疏水性强化气液相界面运动

Super-wettability meshes enhance movement of gas-liquid interface

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