Research on power consumption characteristics of high viscosity fluid mixing in acoustic resonance mixer

doi:10.11949/0438-1157.20231168

Abstract

Abstract:

Acoustic resonance hybrid uses mechanical resonance to generate high-acceleration vibrations to promote fluid flow. Its power consumption characteristics play an important role in its design and application. In order to study the power consumption characteristics of the acoustic resonance mixer, a simulation model of the acoustic resonance mixing process was established based on CFD. The force and work power of the wall on the material during the acoustic resonance mixing process of high viscosity fluid were analyzed. The effects of changes in viscosity and vibration parameters on the mixing were explored. The influence of the power consumption characteristics of the acoustic resonance mixer is determined, and the prediction function of the mixing power of the acoustic resonance mixer is established. The research results show that during the mixing process, the instantaneous power of the wall surface working on the liquid phase shows a trend of first decreasing and then stabilizing fluctuations, while the effective power shows a trend of first increasing and then stabilizing fluctuations. This different change trend is caused by the change of the phase difference between the two. The research results show that during the mixing process, the instantaneous power of the wall surface working on the liquid phase shows a trend of first decreasing and then stabilizing fluctuations, while the effective power shows a trend of first increasing and then stabilizing fluctuations. This different changing trend is due to changes in the phase difference. Increasing the amplitude, frequency or low-frequency large amplitude under equal acceleration can increase the instantaneous power and effective power, and reduce the external energy absorbed by the liquid phase to enter the stable flow stage.

Key words: acoustic resonance mixer, high viscosity fluid, gas-liquid two-phase flow, mixing, power consumption characteristics, computational fluid dynamics

摘要：

声共振混合利用机械共振产生高加速度振动，从而促进流体流动，其功耗特性对于其设计及应用具有重要作用。为研究声共振混合器的功耗特性，基于CFD建立了声共振混合过程仿真模型，分析了高黏度流体声共振混合过程壁面对物料的作用力和做功功率，探究了黏度和振动参数改变对混合器功耗特性的影响，并建立了声共振混合器混合功率的预测函数。研究结果表明，在混合过程中，壁面对液相做功的瞬时功率呈现先减少后稳定波动的趋势，而有效功率呈现先增加后稳定波动的趋势，这种不同的变化趋势是由于两者的相位差发生变化所导致的。增加振幅、频率或等加速度下低频大振幅都能够增加瞬时功率和有效功率，并减少液相进入稳定流动阶段所需吸收的外界能量。

关键词: 声共振混合器, 高黏度流体, 气液两相流, 混合, 功耗特性, 计算流体力学

CLC Number:

TQ 051.7

Xiaobin ZHAN, Huibin WANG, Yalong JIANG, Tielin SHI. Research on power consumption characteristics of high viscosity fluid mixing in acoustic resonance mixer[J]. CIESC Journal, 2024, 75(2): 531-542.

詹小斌, 王会彬, 蒋亚龙, 史铁林. 声共振混合器高黏度流体混合的功耗特性研究[J]. 化工学报, 2024, 75(2): 531-542.

Figures/Tables 15

Fig.1 Schematic diagram of acoustic resonance hybrid system

Table 1 Material parameters

参数	数值
甘油密度/(kg·m^-3)	1260
甘油黏度/(kg·m^-1·s^-1)	0.8
空气密度/(kg·m^-3)	1.225
空气黏度/(kg·m^-1·s^-1)	1.79×10^-5
甘油空气相间表面张力/(N·m^-1)	0.063

Fig.2 The specific position of pressure stress and friction stress

Fig.3 Velocity curve on the z axis in a container with different number of grids

Fig.4 The maximum peak height of the liquid level in experiments and simulations with an amplitude of 3 mm and different frequencies

Fig.5 Liquid phase velocity cloud diagram and vector diagram of y=0 mm section at different time

Fig.6 The lowest height of the liquid level at different time during the mixing process

Fig.7 Vorticity cloud images of liquid phase movement on a y=0 mm cross-section at different time

Fig.8 Volume average of liquid motion vorticity at different time

Fig.9 The wall force on liquid phase under different conditions

Fig.10 Instantaneous power and effective power of work done by the lower wall facing the material at different amplitudes when the frequency is 60 Hz

Fig.11 The changing trend of the phase difference between the wall force and the container velocity as the mixing time increases

Fig.12 Influence of viscosity change on instantaneous and effective power

Fig.13 The effective power and the work done by the wall to the liquid phase under different vibration parameters

Fig.14 Comparison of predicted and simulated effective power under different amplitudes and frequencies

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