颗粒黏附率对载颗粒气泡上升行为特性的实验研究  

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

作　　者：吴晅[1] 李晓峰 董慧 孙高瑾 刘孝培 王正阳 WU Xuan;LI Xiaofeng;DONG Hui;SUN Gaojin;LIU Xiaopei;WANG Zhengyang(School of Energy and Environment,Inner Mongolia University of Science and Technology,Baotou 014010,Inner Mongolia,China)

机构地区：[1]内蒙古科技大学能源与环境学院,内蒙古包头014010

出　　处：《化工学报》2024年第10期3507-3517,共11页CIESC Journal

基　　金：国家自然科学基金项目(51666015)。

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300μm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。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 300μm 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.

关 键 词：气泡 气液两相流 颗粒物料 颗粒黏附率 

分 类 号：TQ021.1[化学工程]