化工学报 ›› 2022, Vol. 73 ›› Issue (7): 2902-2911.doi: 10.11949/0438-1157.20220320

• 流体力学与传递现象 • 上一篇    下一篇

受限空间内浮升气泡与液体间传质行为实验研究

解文潇1(),贾胜坤1,2(),张会书1,2,罗祎青1,2,袁希钢1,2,3()   

  1. 1.天津大学化工学院，天津 300354
    2.天津大学化学工程研究所，天津 300354
    3.化学工程联合国家重点实验室，天津 300354
  • 收稿日期:2022-03-02 修回日期:2022-05-13 出版日期:2022-07-05 发布日期:2022-08-01
  • 通讯作者: 贾胜坤,袁希钢 E-mail:xiewenxiao@tju.edu.cn;jiask@tju.edu.cn;yuanxg@tju.edu.cn
  • 作者简介:解文潇（1997—），男，硕士研究生，xiewenxiao@tju.edu.cn
  • 基金资助:
    国家自然科学基金项目(22178247)

Investigation on mass transfer behavior between floating bubbles and liquid in confined space

Wenxiao XIE1(),Shengkun JIA1,2(),Huishu ZHANG1,2,Yiqing LUO1,2,Xigang YUAN1,2,3()   

  1. 1.School of Chemical Engineering and Technology, Tianjin University, Tianjin 300354, China
    2.Chemical Engineering Research Center, Tianjin University, Tianjin 300354, China
    3.State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin 300354, China
  • Received:2022-03-02 Revised:2022-05-13 Published:2022-07-05 Online:2022-08-01
  • Contact: Shengkun JIA,Xigang YUAN E-mail:xiewenxiao@tju.edu.cn;jiask@tju.edu.cn;yuanxg@tju.edu.cn

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摘要：

采用紫外诱导荧光(UIF)实验方法，研究Hele-Shaw狭缝受限尺度对受限空间内浮升气泡流体力学与气液传质行为的影响。实验中以二苯并[b，e]吡啶作为荧光剂实现了受限空间内CO2溶液浓度分布及其气泡运动速度的定量测量，获得了CO2在受限空间内运动过程中的传质量和气泡动力学参数，并分别计算气泡受限空间内液膜区和自由接触区的传质速率。分析得到受限空间中不同狭缝宽度内CO2的传质行为，分析了受限尺度对CO2-水体系传质过程的影响。

关键词: 受限空间, 传质, 气泡流动行为, 紫外诱导荧光实验, 受限尺度

Abstract:

The ultraviolet-induced fluorescence (UIF) experimental method was used to study the effect of the confined scale of the Hele-Shaw slit on the hydrodynamics and gas-liquid mass transfer behavior of the buoyant bubble in the confined space. In the experiment, dibenzo [b, e] pyridine was used as a fluorescent agent to realize the quantitative measurement of CO2 solution concentration distribution and bubble velocity in the confined space. The mass transfer and bubble dynamics parameters of CO2 in the confined space were obtained, and the mass transfer rates of liquid film area and free contact area in the confined space were calculated respectively. The mass transfer behavior of CO2 in different slit widths in confined space was analyzed, and the influence of confined scale on the mass transfer process of CO2 water system was analyzed as well.

Key words: confined apace, mass transfer, bubble flow behavior, UV induced fluorescence experiment, confined scale

中图分类号: 

  • TQ 021.4

图1

受限空间气液传质装置"

图2

不同狭缝宽度内溶液灰度值与CO2浓度标定曲线"

图3

CO2单气泡尾迹图（0.6 mm狭缝宽度，25℃）"

图4

受限空间内气泡形状变化"

图5

(a) 气泡轮廓拟合成椭圆；(b) 椭圆的长短轴"

图6

不同狭缝宽度下受限空间内气泡平均浮升终速(a)受限空间内气泡平均浮升终速随de的变化及其与非受限空间浮升速度的比较;(b) de为4 mm气泡质心轨迹的4次测量结果"

图7

受限空间内液体与浮升气泡传质示意图 （Pf：气泡内轮廓周长；Sp：自由界面区面积；Sf：液膜区面积）"

图8

单气泡通过后CO2浓度分布（0.6 mm狭缝宽度，25℃）"

图9

(a)不同受限空间内气液相间传质速率；(b)不同受限空间内气液相间液相侧传质系数"

图10

受限空间内液膜区传质系数(a)、自由界面区传质系数(b)和气泡纵横比E(c)随投影面积当量直径变化关系"

表1

受限空间与非受限空间内的气液传质系数对比"

系统类型kL/(105m/s)a/(m2/m3)kLa/(102s-1)
逆流填料塔[31]4~2010~3500.04~7.00
鼓泡塔[31]10~4050~6000.5~24.0
浸入式和插入式喷射反应堆[33]1.5~5.020~500.03~0.60
喷雾柱[33]12~1975~1701.5~2.2
微反应器[7]40340030
本研究20~50200~6004~30

图11

不同狭缝宽度内气泡在液膜区的传质边界层厚度"

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