Experimental study of characteristics of particle adhesion rate on rising behavior of particle-loaded bubbles

doi:10.11949/0438-1157.20240494

Abstract

Abstract:

The rising behavior of particle-loaded bubbles was studied by high-speed camera technology. The particle adhesion rate was introduced to quantitatively characterize the amount of particle adhesion on bubbles, with polymethyl methacrylate (PMMA) particles used as the basic material for the particle bed layer. Changes in the bubble-particle adhesion rate were observed under different particle sizes and flow rates, and analyses were conducted on the bubble morphology, bubble size, and vertical ascending speed of particle-loaded bubbles. The ascending behavior characteristics of particle-loaded bubbles were revealed. The research results indicate that under conditions of a 300 μm particle size, an increase in flow rate reduces the amount of particles loaded on bubbles, resulting in a decrease in the particle adhesion rate. However, the impact of increased flow rate on the particle adhesion rate is effectively offset by reducing particle size. Under larger particle size conditions, higher particle adhesion rates stabilize bubble morphology, resulting in smaller overall bubble size and slower vertical ascending speed. The influence of flow rate on bubble morphology, size, and vertical ascending speed is weakened by decreasing particle size. Smaller particle sizes lead to an increased production of anisotropic bubbles with approximate particle adhesion rates.

Key words: bubbles, gas-liquid flow, granular materials, particle adhesion rate

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形气泡的产出。

关键词: 气泡, 气液两相流, 颗粒物料, 颗粒黏附率

CLC Number:

TQ 021.1

Xuan WU, Xiaofeng LI, Hui DONG, Gaojin SUN, Xiaopei LIU, Zhengyang WANG. Experimental study of characteristics of particle adhesion rate on rising behavior of particle-loaded bubbles[J]. CIESC Journal, 2024, 75(10): 3507-3517.

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, 2024, 75(10): 3507-3517.

Figures/Tables 21

Fig.1 Schematic diagram of visualisation experiment

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	热变形稳定温度	玻璃化温度	透光率
1.49	25~28	50~77 MPa	2%~3%	90~130 MPa	96℃	104℃	>92%

Table 2 Physical properties of gas phase

气泡初始直径	密度	黏度	界面张力
2~8 mm	1.225 kg/m³	1.789×10^-5Pa∙s	0.09 N/m

Fig.2 Flow of obtaining particle adhesion rate

Fig.3 Schematic diagram of single bubble aspect ratio acquisition

Fig.4 Schematic diagram for obtaining equivalent diameter of single bubble

Fig.5 Changes in particle adhesion rates at different flow rates for particle sizes of 300 μm and 200 μm

Fig.6 Average particle adhesion rates of bubble Groups A—E for particle sizes of 300 μm and 200 μm

Table 3 Statistical values of particle adhesion rate

粒径/μm	流量/(ml/min)	黏附率/%
粒径/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
300	38 (A组)	77.60	100.00	100.00	100.00	9.68
	76 (B组)	100.00	46.77	8.36	11.96	24.54
	114 (C组)	55.23	20.57	14.76	51.31	6.18
	152 (D组)	23.07	16.17	5.33	7.00	5.60
	190 (E组)	19.45	16.34	13.16	9.69	14.03
200	38 (A组)	39.93	100.00	21.34	13.92	100.00
	76 (B组)	31.75	100.00	9.10	100.00	8.29
	114 (C组)	22.05	20.34	28.42	33.91	100.00
	152 (D组)	9.26	10.76	9.75	8.79	100.00
	190 (E组)	26.49	100.00	100.00	11.83	13.50
100	38 (A组)	72.46	100.00	14.55	100.00	100.00
	76 (B组)	56.46	63.29	62.88	100.00	9.48
	114 (C组)	1.18	78.05	100.00	18.33	100.00
	152 (D组)	18.85	71.03	100.00	18.61	100.00
	190 (E组)	43.43	72.27	100.00	47.87	13.92

Fig.7 Aspect ratio changes for a particle size of 300 μm with adhesion rates of 100.00%, 20.57% and 16.34% (bubble 2)

Fig.8 Mean aspect ratio changes of bubbles 1, 3 and 4 with decreasing particle adhesion rates for particle size of 300 μm

Fig.9 Variation in average aspect ratio of bubble Groups A—E for three particle sizes

Fig.10 Aspect ratio changes in adhesion of 14.03%, 13.50% and 13.92% (bubble 5) for three particle sizes

Fig.11 Equivalent diameter changes for a particle size of 300 μm with adhesion rates of 100.00%, 20.57% and 16.34% (bubble 2)

Fig.12 Mean equivalent diameter changes of bubbles 1, 3 and 4 with decreasing particle adhesion rates for a particle size of 300 μm

Fig.13 Variation in average equivalent diameter of bubble Groups A—E for three particle sizes

Fig.14 Equivalent diameter distributions of particle adhesion of 14.03%, 13.50% and 13.92% (bubble 5) for three particle sizes

Fig.15 Vertical ascent speed changes for a particle size of 300 μm with adhesion rates of 100.00%, 20.57% and 16.34%

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

Fig.17 Variation in average vertical ascent speed of bubble Groups A—E for three particle sizes

Fig.18 Vertical upward velocity distributions of particle adhesion of 14.03%, 13.50% and 13.92% (bubble 5) for three particle sizes

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