摘要
小通道填充泡沫金属成为近几年强化换热方向的研究热点。以空气和水为工作介质,将PPI为10和20的泡沫金属分别填充到截面为2.5 mm×2.5 mm的T型小通道内,改变泡沫金属的亲疏水性,分别研究弹状流和环状流下气液两相表观流速及亲疏水性对相分离的影响机制。比较亲水、疏水处理及未处理这三种泡沫金属的分离特性发现:无论是弹状流还是环状流,分离效果最好的是亲水处理后的泡沫金属,其次是未经处理的泡沫金属,而进行疏水处理后的分离效果最差,填充泡沫金属的T型通道相分离效果要明显好于未填充的通道。对于亲疏水处理过的T型通道,无论是弹状流还是环状流,T型小通道内侧支管气相采出分率占优,液相采出分率随着液体表观速度的增加而降低,但气相表观速度对液相采出分率影响很小。而泡沫金属PPI的减小会降低气相采出分率,使分配效果更加趋近于均匀分布线。
Filling foam metal with small channels has become a research hotspot in the direction of heat transfer in recent years. Use air and water as working medium, the foam metal with PPI of 10 and 20 is filled into a T-shaped small channel with a cross section of 2.5 mm × 2.5 mm respectively. Change the hydrophilicity and hydrophobicity of metal foam, then study the influence mechanism of gas-liquid two-phase superficial velocity and hydrophilicity as well as hydrophobicity on phase separation under the action of slug flow and annular flow. The separation characteristics of three foamed metals treated with hydrophilic treatment, hydrophobic treatment and untreated were compared: whether it is a slug flow or an annular flow, the best separation effect is the hydrophilic treated foam metal, then the untreated foam metal, and the hydrophobic treatment foam metal get the worst effect, phase separation effect of T-channels filled with metal foam is significantly better than unfilled channels. For hydrophilic treated and hydrophobic treated T-channels, whether it is a slug flow or an annular flow, the gas phase recovery fraction of the inner branch of the T-shaped small channel is dominant, the liquid phase recovery fraction decreases with the increase of superficial velocity of the liquid, but the superficial velocity of gas phase has little effect on the liquid fraction. However, the reduction of the foam metal PPI will reduce the gas phase recovery fraction, which makes the distribution effect closer to the uniform distribution line.
作者
李洪伟
魏国宝
王亚成
付东威
LI Hongwei;WEI Guobao;WANG Yacheng;FU Dongwei(School of Energy and Power Engineering,Northeast Electric Power University,Jilin 132012,Jilin,China)
出处
《化工学报》
EI
CAS
CSCD
北大核心
2019年第11期4216-4230,共15页
CIESC Journal
基金
吉林省自然科学基金项目(20170101123JC)
关键词
T型小通道
流型
相分离
泡沫金属
亲疏水性
T-junction
flow pattern
phase splitting
metal foam
hydrophilicity and hydrophobicity
