Multi-scale motion characteristics of coarse particles in a swirling flow pneumatic conveying system with the discrete wavelet transform

IF 3.9 3区 工程技术 Q2 ENGINEERING, CHEMICAL
Fei Yan , Mengfei Zhang , Shihao Cheng , Yu Zongbing , Jian Zhang
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Abstract

In order to achieve low-speed operation of pneumatic conveying, this paper proposes a new type of swirling flow blade that promotes particle suspension and acceleration by controlling the generation of swirling. Firstly, the energy-saving efficiency of swirling flow was evaluated in term of the pressure drop and power consumption coefficient, and it is revealed that the optimal conveying velocity and power consumption coefficient are reduced for the swirling flow compared to the conventional axial flow, the maximum reduction rates are 12.99 % and 9.47 %, respectively. Then, to master the particle motion characteristics for swirling flow conveying, the electrical capacitance tomography (ECT) and particle image velocimetry (PIV) were employed to analyze the particle concentration and velocity distributions, the results show that the particle concentration of swirling flow is lower than the conventional axial flow around the bottom of the pipe, and the particle velocity of swirling flow is higher than the conventional axial flow, suggesting that the particles are easily suspended and accelerated for the swirling flow conveying. The core innovation lies in the analysis of the particle velocity field by utilizing one-dimensional discrete wavelet transform (DWT) and continuous wavelet transform (CWT), which reveals the energy-saving mechanism of swirling flow conveying. The results show that using blade enhances large-scale velocity fluctuations and particle suspension, leading to lower center frequencies. It also increases pulsation intensity at pipe bottom, stabilizes small-scale motion at pipe top, and improves spatial correlation.
用离散小波变换研究旋流气力输送系统中粗颗粒的多尺度运动特性
为了实现气力输送的低速运行,本文提出了一种新型旋流叶片,通过控制旋流的产生来促进颗粒悬浮和加速。首先,从压降和功耗系数两个方面对旋流的节能效率进行了评价,结果表明,旋流的最佳输送速度和功耗系数比常规轴流降低了,最大降幅分别为12.99 %和9.47 %。然后,为掌握旋流输送的颗粒运动特性,采用电容层析成像(ECT)和颗粒图像测速(PIV)对颗粒浓度和速度分布进行了分析,结果表明:旋流在管道底部周围的颗粒浓度低于常规轴向流,而旋流的颗粒速度高于常规轴向流;说明颗粒在旋流输送中容易悬浮和加速。其核心创新在于利用一维离散小波变换(DWT)和连续小波变换(CWT)对颗粒速度场进行分析,揭示了旋流输送的节能机理。结果表明:叶片的使用增强了大尺度的速度波动和颗粒悬浮,降低了中心频率;它还增加了管道底部的脉动强度,稳定了管道顶部的小尺度运动,并改善了空间相关性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Chemical Engineering Research & Design
Chemical Engineering Research & Design 工程技术-工程:化工
CiteScore
6.10
自引率
7.70%
发文量
623
审稿时长
42 days
期刊介绍: ChERD aims to be the principal international journal for publication of high quality, original papers in chemical engineering. Papers showing how research results can be used in chemical engineering design, and accounts of experimental or theoretical research work bringing new perspectives to established principles, highlighting unsolved problems or indicating directions for future research, are particularly welcome. Contributions that deal with new developments in plant or processes and that can be given quantitative expression are encouraged. The journal is especially interested in papers that extend the boundaries of traditional chemical engineering.
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