受限空间内浮升气泡与液体间传质行为实验研究

doi:10.11949/0438-1157.20220320

摘要/Abstract

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

解文潇, 贾胜坤, 张会书, 罗祎青, 袁希钢. 受限空间内浮升气泡与液体间传质行为实验研究[J]. 化工学报, 2022, 73(7): 2902-2911.

Wenxiao XIE, Shengkun JIA, Huishu ZHANG, Yiqing LUO, Xigang YUAN. Investigation on mass transfer behavior between floating bubbles and liquid in confined space[J]. CIESC Journal, 2022, 73(7): 2902-2911.

图/表 12

图1 受限空间气液传质装置

Fig.1 Experiment set-up for gas-liquid mass transfer in confined space

图2 不同狭缝宽度内溶液灰度值与CO2浓度标定曲线

Fig.2 Calibration curves between gray level and dissolved CO2 concentration in standard samples in thin gap with different gap widths

图3 CO2单气泡尾迹图（0.6 mm狭缝宽度，25℃）

Fig.3 The wake diagram of a CO2 bubble (0.6 mm width, 25℃)

图4 受限空间内气泡形状变化

Fig.4 Shape change of bubbles in confined space

图5 (a) 气泡轮廓拟合成椭圆；(b) 椭圆的长短轴

Fig.5 (a) Equivalent ellipse for bubble contours; (b) Major and minor axes of an ellipse

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

Fig.6 Average final velocity of bubble buoyancy in confined space under different slit widths(a) variation of average final buoyancy velocity of bubbles in confined space with de and its comparison with that in unrestricted space; (b) four measurement results of bubble centroid trajectory when de is 4 mm

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）

Fig.7 Schematic of mass transfer from a rising CO2 bubble to liquid confined in a gap (Pf：inner contour perimeter of bubble；Sp：free contact area；Sf：liquid film area)

图8 单气泡通过后CO2浓度分布（0.6 mm狭缝宽度，25℃）

Fig.8 CO2 concentration distribution after passage of a bubble (0.6 mm width, 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

Fig.9 (a) Mass transfer rate from rising CO2 bubble to liquid confined in gaps with different widths; (b) Liquid-side mass transfer coefficient from rising CO2 bubble to liquid confined in gaps with different widths

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

Fig.10 Mass transfer coefficient of liquid film zone (a), mass transfer coefficient of free interface region (b) and bubble aspect ratio E (c) varied with projected area equivalent diameter in confined space

表1 受限空间与非受限空间内的气液传质系数对比

Table 1 Comparison of gas-liquid mass transfer coefficient between confined space and unrestricted space

系统类型	$k_{L} / (10^{5} m / s)$	a/(m²/m³)	$k_{L} a / (10^{2} s^{- 1})$
逆流填料塔^[31]	4~20	10~350	0.04~7.00
鼓泡塔^[31]	10~40	50~600	0.5~24.0
浸入式和插入式喷射反应堆^[33]	1.5~5.0	20~50	0.03~0.60
喷雾柱^[33]	12~19	75~170	1.5~2.2
微反应器^[7]	40	3400	30
本研究	20~50	200~600	4~30

表1 受限空间与非受限空间内的气液传质系数对比

Table 1 Comparison of gas-liquid mass transfer coefficient between confined space and unrestricted space

系统类型	$k_{L} / (10^{5} m / s)$	a/(m²/m³)	$k_{L} a / (10^{2} s^{- 1})$
逆流填料塔^[31]	4~20	10~350	0.04~7.00
鼓泡塔^[31]	10~40	50~600	0.5~24.0
浸入式和插入式喷射反应堆^[33]	1.5~5.0	20~50	0.03~0.60
喷雾柱^[33]	12~19	75~170	1.5~2.2
微反应器^[7]	40	3400	30
本研究	20~50	200~600	4~30

图11 不同狭缝宽度内气泡在液膜区的传质边界层厚度

Fig.11 Mass boundary thickness of bubble in liquid film region confined in gaps with different widths

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