CIESC Journal ›› 2019, Vol. 70 ›› Issue (11): 4216-4230.doi: 10.11949/0438-1157.20190481

• Fluid dynamics and transport phenomena • Previous Articles     Next Articles

Investigation on effect of hydrophilicity and hydrophobicity of metal foam on phase separation characteristics of gas-liquid two-phase flow in T-junction

Hongwei LI(),Guobao WEI,Yacheng WANG,Dongwei FU   

  1. School of Energy and Power Engineering, Northeast Electric Power University, Jilin 132012, Jilin, China
  • Received:2019-05-08 Revised:2019-06-17 Online:2019-11-05 Published:2019-11-05
  • Contact: Hongwei LI E-mail:lihongwei@neepu.edu.cn

Abstract:

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.

Key words: T-junction, flow pattern, phase splitting, metal foam, hydrophilicity and hydrophobicity

CLC Number: 

  • TQ 051.5

Fig.1

Experimental system"

Table 1

Instrument parameter"

仪器名称仪器型号参数

微型水泵

NP039

入口真空度为-0.85×105 Pa,进出口压差为20×105 Pa,工作转速为100~4000 r/min,耐温-40~150℃
微型气泵HC1.30DC电压24 V,气液通用,最大真空38 kPa,压头 >15 m
电子天平FA2004A测量范围0~200 g,精度0.1 mg
气体质量流量计MF 4008最大流量50 SLPM,精度±(1.5+0.2FS),显示分辨率0.01SLPM,响应时间10 ms
高速摄像机Photron FASTCAM Mini UX100分辨率1280×1024, 最大帧频4000 帧/秒

Fig.2

Structure of small- T- junction"

Fig.3

Metal foam"

Fig.4

Static contact angle of hydrophilic surface"

Fig.5

Static contact angle of hydrophobic surface"

Fig.6

Picture and schematic diagram of flow (PPI = 10)"

Fig.7

Flow pattern map with different PPI (pores per inch)"

Fig.8

Comparison of flow pattern transition criteria between different PPI(pores per inch)"

Fig.9

Surface energy conversion process"

Fig.10

Force analysis of bubbles"

Fig.11

Effect of different PPI on phase separation of slug and annular flow"

Fig.12

Effect of superficial liquid velocity on phase split under annular flow"

Fig.13

Effect of superficial gas velocity on phase separation of annular flow"

Fig.14

Comparison of phase split characteristics of annular flow"

Fig.15

Effect of liquid superficial velocity on phase split under slug flow"

Fig.16

Effect of superficial gas velocity on phase split under slug flow"

Fig.17

Comparison of phase split characteristics of slug flow"

Fig.18

Effect of superficial liquid velocity on phase split under annular flow"

Fig.19

Effect of superficial gas velocity on phase split under annular flow"

Fig.20

Comparison of phase split characteristics of annular flow"

Fig.21

Effect of superficial liquid velocity on phase split under slug flow after hydrophobic treatment"

Fig.22

Effect of superficial gas velocity on phase split under slug flow after hydrophobic treatment"

Fig.23

Comparison of phase split characteristics of slug flow after hydrophobic treatment"

Fig.24

Comparison of phase split characteristics of mental foam after treatment"

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