低固含率下共振声分散特性数值模拟

doi:10.16085/j.issn.1000-6613.2019-0115

摘要/Abstract

摘要：

研究共振声混合的流场和分散特性对于力热敏感超细材料的混合具有十分重要的意义。为模拟共振声混合的流场和分散特性，本文建立了基于CLSVOF-DPM的气液固三相流模型，并采用不同区域内颗粒数量的标准差评价混合均匀度。CLSVOF模型求解气液界面和分散流场，DPM模型追踪颗粒位置，通过连续相与颗粒之间的动量交换实现CLSVOF模型和DPM模型的双向耦合。计算结果表明，在加速度超过30g时流场中出现了湍流由液面附近向下扩散的现象；液体填充比和加料位置影响分散效率和分散质量；激振加速度为40g时达到混合均匀的时间最短。利用自制的共振声混合样机进行了实验，采用PIV系统记录了不同激振加速度下的流场矢量图，对实验和仿真的径向速度分布进行对比。实验结果证明了仿真计算结果的准确性。

关键词: 共振声混合, 低固含率, 多相流, 分散, 数值模拟

Abstract:

The investigation on the flow field and dispersion characteristics of resonant sound mixing is of great significance for the dispersion mixing of heat sensitive superfine materials. In order to simulate the flow field and dispersion characteristics of resonant sound mixing, a gas-liquid-solid three-phase flow model based on CLSVOF-DPM was established, and the mixing uniformity was evaluated by the standard deviation of the number of particles in different regions. The CLSVOF model solves the gas-liquid interface and the dispersion flow field. The DPM model tracks the particle position and realizes the bidirectional coupling of the CLSVOF model and the DPM model through the momentum exchange between the continuous phase and the particles. The calculation results showed that the turbulent flow is diffused downward from the vicinity of the liquid surface when the acceleration exceeds 30g, where g is the gravitational acceleration. The liquid filling ratio and the feeding position affect the dispersion efficiency and quality. The uniform dispersion time is the shortest when the excitation acceleration is 40g. Finally, experiments were carried out using a self-made resonance acoustic hybrid prototype, and the flow field vector under different excitation accelerations was recorded using the PIV system, and the radial velocity distributions of the experiments and simulations were compared. The experimental results prove the accuracy of the simulation ones.

Key words: resonant acoustic mixing, low solid content, multiphase flow, dispersion, numerical simulation

中图分类号:

TQ56

朱士富,王小鹏,陈松,徐兴强. 低固含率下共振声分散特性数值模拟[J]. 化工进展, 2019, 38(10): 4414-4422.

Shifu ZHU,Xiaopeng WANG,Song CHEN,Xingqiang XU. Simulation of dispersion characteristics of resonant acoustic mixing with low solid content of powder[J]. Chemical Industry and Engineering Progress, 2019, 38(10): 4414-4422.

图/表 12

图1 容器几何模型及网格划分

图2 CLSVOF-DPM耦合计算流程

表1 模型参数表

参数	数值
水相密度/kg·m^-3	998.2
水相黏度/kg·m^-1·s^-1	0.001
气相密度/kg·m^-3	1.225
气相黏度/kg·m^-1·s^-1	1.79×10^-5
气液两相间张力系数/N·m^-1	0.073
颗粒直径/μm	15
颗粒密度/kg·m^-3	1500

图3 不同时刻共振声混合流场特性（从左至右依次为0.1s、0.3s、0.5s时的情况）

表2 模拟工况表

工况	加料位置	液体填充比/%
a	液面处	70
b	液体底部	70
c	液面处	90
d	液体底部	90

图4 不同工况下颗粒分布均匀度随时间变化图

图5 t=3s时不同液体填充比下的仿真结果（左侧液体填充比为70%，右侧为90%）

图6 不同加速度下颗粒分布均匀度随时间变化图

图7 t=3s时不同加速度下仿真结果（从左到右激振加速度依次为20g、30g、40g）

图8 PIV现场测试照片

图9 PIV实验速度矢量图（从左到右激振加速度依次为20g、30g、40g）

图10 径向速度沿轴向分布实验值与仿真值对比

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