• •
收稿日期:
2024-05-06
修回日期:
2024-06-26
出版日期:
2024-07-09
通讯作者:
吴晅
作者简介:
吴晅(1976—),男,博士,教授,wxgif@163.com
基金资助:
Xuan WU(), Xiaofeng LI, Hui DONG, Gaojin SUN, Xiaopei LIU, Zhengyang WANG
Received:
2024-05-06
Revised:
2024-06-26
Online:
2024-07-09
Contact:
Xuan WU
摘要:
利用高速摄像技术研究载颗粒气泡上升行为特性,引入颗粒黏附率来定量表征气泡的颗粒黏附量,用聚甲基丙烯酸甲酯 (PMMA) 颗粒物料作为颗粒床层基本材料,观察在不同粒径和不同流量下气泡颗粒黏附率的变化过程,分析了载颗粒的气泡形态,气泡尺寸,气泡垂直上升速度的变化规律,揭示了载颗粒气泡的上升行为特性。研究结果表明:颗粒粒径300 μm条件下流量增大会使气泡负载颗粒量减小,导致颗粒黏附率降低,但粒径的减小可以有效抵消流量增大对颗粒黏附率的影响;在较大粒径条件下,颗粒黏附率越大,气泡形态越稳定,气泡整体尺寸越小,气泡垂直上升速度越低;减小载颗粒粒径可以减弱流量对气泡的形态、尺寸和垂直上升速度的影响;颗粒黏附率近似的气泡,颗粒粒径的减小会增加异性气泡的产出。
中图分类号:
吴晅, 李晓峰, 董慧, 孙高瑾, 刘孝培, 王正阳. 颗粒黏附率对载颗粒气泡上升行为特性的实验研究[J]. 化工学报, DOI: 10.11949/0438-1157.20240494.
Xuan WU, Xiaofeng LI, Hui DONG, Gaojin SUN, Xiaopei LIU, Zhengyang WANG. Experimental study of the characteristics of particle adhesion rate on the rising behaviour of particle-loaded bubbles[J]. CIESC Journal, DOI: 10.11949/0438-1157.20240494.
折射率 | 硬度 | 拉伸强度 | 断裂伸长率 | 弯曲强度 | 热变形稳定 | 玻璃化温度 | 透光率 |
---|---|---|---|---|---|---|---|
1.49 | 25~28 | 50~77Mpa | 2%~3% | 90~130Mpa | 96℃ | 104℃ | >92% |
表1 PMMA材料的物理特性
Table 1 Physical properties of PMMA materials
折射率 | 硬度 | 拉伸强度 | 断裂伸长率 | 弯曲强度 | 热变形稳定 | 玻璃化温度 | 透光率 |
---|---|---|---|---|---|---|---|
1.49 | 25~28 | 50~77Mpa | 2%~3% | 90~130Mpa | 96℃ | 104℃ | >92% |
气泡初始直径 | 密度 | 粘度 | 界面张力 |
---|---|---|---|
2~8 mm | 1.225 kg∙m-3 | 1.789×10-5 Pa∙s | 0.09 N∙m-1 |
表2 气相物理性质
Table 2 Physical properties of the gas phase
气泡初始直径 | 密度 | 粘度 | 界面张力 |
---|---|---|---|
2~8 mm | 1.225 kg∙m-3 | 1.789×10-5 Pa∙s | 0.09 N∙m-1 |
图6 颗粒粒径为 300 μm 和 200 μm 条件下 A~E 组气泡组的平均颗粒黏附率 (%)
Fig.6 Average particle adhesion rates (%) of bubble Groups A~E for particle sizes of 300 μm and 200 μm
粒径大小(μm) | 流量(ml/min) | 1号气泡 | 2号气泡 | 3号气泡 | 4号气泡 | 5号气泡 |
---|---|---|---|---|---|---|
粒径为 300 μm | 38 ml/min (A组) | 77.60% | 100% | 100% | 100% | 9.68% |
76 ml/min (B组) | 100% | 46.77% | 8.36% | 11.96% | 24.54% | |
114 ml/min (C组) | 55.23% | 20.57% | 14.76% | 51.31% | 6.18% | |
152 ml/min (D组) | 23.07% | 16.17% | 5.33% | 7.00% | 5.60% | |
190 ml/min (E组) | 19.45% | 16.34% | 13.16% | 9.69% | 14.03% | |
粒径为 200 μm | 38 ml/min (A组) | 39.93% | 100% | 21.34% | 13.92% | 100% |
76 ml/min (B组) | 31.75% | 100% | 9.10% | 100% | 8.29% | |
114 ml/min (C组) | 22.05% | 20.34% | 28.42% | 33.91% | 100% | |
152 ml/min (D组) | 9.26% | 10.76% | 9.75% | 8.79% | 100% | |
190 ml/min (E组) | 26.49% | 100% | 100% | 11.83% | 13.5% | |
粒径为 100 μm | 38 ml/min (A组) | 72.46% | 100% | 14.55% | 100% | 100% |
76 ml/min (B组) | 56.46% | 63.29% | 62.88% | 100% | 9.48% | |
114 ml/min (C组) | 1.18% | 78.05% | 100% | 18.33% | 100% | |
152 ml/min (D组) | 18.85% | 71.03% | 100% | 18.61% | 100% | |
190 ml/min (E组) | 43.43% | 72.27% | 100% | 47.87% | 13.92% |
表3 颗粒黏附率统计数值
Table 3 Statistical values of particle adhesion rate
粒径大小(μm) | 流量(ml/min) | 1号气泡 | 2号气泡 | 3号气泡 | 4号气泡 | 5号气泡 |
---|---|---|---|---|---|---|
粒径为 300 μm | 38 ml/min (A组) | 77.60% | 100% | 100% | 100% | 9.68% |
76 ml/min (B组) | 100% | 46.77% | 8.36% | 11.96% | 24.54% | |
114 ml/min (C组) | 55.23% | 20.57% | 14.76% | 51.31% | 6.18% | |
152 ml/min (D组) | 23.07% | 16.17% | 5.33% | 7.00% | 5.60% | |
190 ml/min (E组) | 19.45% | 16.34% | 13.16% | 9.69% | 14.03% | |
粒径为 200 μm | 38 ml/min (A组) | 39.93% | 100% | 21.34% | 13.92% | 100% |
76 ml/min (B组) | 31.75% | 100% | 9.10% | 100% | 8.29% | |
114 ml/min (C组) | 22.05% | 20.34% | 28.42% | 33.91% | 100% | |
152 ml/min (D组) | 9.26% | 10.76% | 9.75% | 8.79% | 100% | |
190 ml/min (E组) | 26.49% | 100% | 100% | 11.83% | 13.5% | |
粒径为 100 μm | 38 ml/min (A组) | 72.46% | 100% | 14.55% | 100% | 100% |
76 ml/min (B组) | 56.46% | 63.29% | 62.88% | 100% | 9.48% | |
114 ml/min (C组) | 1.18% | 78.05% | 100% | 18.33% | 100% | |
152 ml/min (D组) | 18.85% | 71.03% | 100% | 18.61% | 100% | |
190 ml/min (E组) | 43.43% | 72.27% | 100% | 47.87% | 13.92% |
图7 粒径 300 μm,颗粒黏附率分别为 100%,20.57%,16.34% (2 号气泡) 的纵横比变化
Fig 7 Aspect ratio changes for a particle size of 300 μm with adhesion rates of 100%, 20.57% and 16.34% (Bubble 2)
图8 粒径 300 μm,颗粒黏附率递减的 1、3、4 号气泡的纵横比均值变化
Fig.8 Mean aspect ratio changes of bubbles 1, 3and 4 with decreasing particle adhesion rates for a particle size of 300 μm
图9 三种粒径下A~E五组气泡组平均纵横比的变化规律注:2.2.2 颗粒黏附率对载颗粒气泡上升时尺寸大小的影响
Fig.9 Variation in average aspect ratio of 13.5%,13.92% (5 号气泡) 的纵横比变化bubble Groups A~E for three particle sizes Fig.10 Aspect ratio changes for a particle size of 300 μmwith adhesion rates of 14.05%, 13.5% and 13.92% (Bubble 5)
图10 三种粒径下颗粒黏附率分别为 14.05%,13.5%,13.92% (5 号气泡) 的纵横比变化
Fig.10 Aspect ratio changes for a particle size of 300 μm with adhesion rates of 14.05%, 13.5% and 13.92% (Bubble 5)
图11 粒径 300 μm,颗粒黏附率分别为 100%,20.57%,16.34% (2号气泡)的当量直径变化
Fig.11 Equivalent diameter changes for a particle size of 300μm with adhesion rates of 100%, 20.57% and 16.34% (Bubble 2)
图12 粒径 300 μm,颗粒黏附率递减的 1、3、4 号气泡的当量直径均值变化
Fig.12 Mean equivalent diameter changes of bubbles 1, 3and 4 with decreasing particle adhesion rates for a particle size of 300 μm
图14 三种粒径条件下颗粒黏附率分别为 14.05%,13.5%,13.92% (5 号气泡) 的当量直径分布
Fig.14 Distribution of equivalent diameter for a particle size of 300 μm with adhesion rates of 14.05%, 13.5% and 13.92% (Bubble 5)
图15 粒径300 μm,颗粒黏附率分别为 100 %,20.57 %,16.34 %的垂直上升速度变化
Fig.15 Vertical ascent speed changes for a particle size of 300 μm with adhesion rates of 100%, 20.57% and 16.34%
图16 粒径 300 μm,颗粒黏附率递减的1、3、4 号气泡的垂直上升速度均值变化
Fig.16 Mean vertical ascent speed changes of bubbles 1, 3 and 4 with decreasing particle adhesion rates for a particle size of 300 μm
图18 三种粒径条件下颗粒黏附率分别 14.05%,13.5%,13.92% (5 号气泡) 的垂直上升速度分布
Fig.18 Distribution of vertical ascent speed for a particle size of 300 μm with adhesion rates of 14.05%, 13.5% and 13.92% (Bubble 5)
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