通过图像分析和渗透性测试耦合研究颗粒尺寸和填料迂回度

IF 4.2 2区 工程技术 Q2 ENGINEERING, CHEMICAL Advanced Powder Technology Pub Date : 2024-08-16 DOI:10.1016/j.apt.2024.104622
Silvia Volpato, Andrea C. Santomaso
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引用次数: 0

摘要

本实验研究旨在加强对使用两种分析技术测量的等效颗粒直径之间相关性的理解:光学分析(计算机辅助图像分析辅助)和渗透性测试。特定分析方法或仪器的存在与否会导致使用不正确的等效直径。因此,在通过不同方法和仪器获得的不同等效颗粒直径之间建立换算规则是有益的。光学分析得出的等效直径值与颗粒排列无关,因为它处理的是孤立的颗粒。相比之下,渗透性测试提供的等效平均直径不仅取决于颗粒的大小,还取决于它们的排列方式。光学方法和渗透率测试法之间的比较产生了一个意想不到的结果,那就是可以分离和描述填料排列对压力损失的影响,并根据流体必须通过填料床的路径的迂回程度来描述这种影响。我们的研究结果证实,我们的曲折度模型与文献中经常用于预测填料床曲折度的经验相关性非常吻合。
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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Investigation on particle size and packing tortuosity by coupling image analysis and permeability tests

This experimental study aims to enhance the understanding of the correlation among equivalent particle diameters measured using two analytical techniques: optical analysis (assisted by computer aided image analysis) and permeability tests. The presence or absence of a specific analytical method or instrument can lead to the use of an incorrect equivalent diameter. Therefore, it can be beneficial to establish conversion rules between different equivalent particle diameters obtained through various methods and instruments. The optical analysis returns an equivalent diameter value inherently independent of particle arrangement since it deals with isolated particles. In contrast, the permeability test offers an equivalent mean diameter dependent not only on the size of the particles but also on their packed arrangement. A suitable correlation between the two diameters has been proposed, shown to be a decreasing function of porosity following a power law.

An unexpected outcome of the comparison between the optical method and permeametry is the possibility to isolate and characterize the effect that the packing arrangement has on pressure losses and to characterize it in terms of the tortuosity of the path that the fluid must travel through the packed bed. Our findings confirm a strong alignment between our tortuosity model, which contains the ratio between the two equivalent diameters considered here, and an empirical correlation from literature often utilized for predicting packed bed tortuosity.

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来源期刊
Advanced Powder Technology
Advanced Powder Technology 工程技术-工程:化工
CiteScore
9.50
自引率
7.70%
发文量
424
审稿时长
55 days
期刊介绍: The aim of Advanced Powder Technology is to meet the demand for an international journal that integrates all aspects of science and technology research on powder and particulate materials. The journal fulfills this purpose by publishing original research papers, rapid communications, reviews, and translated articles by prominent researchers worldwide. The editorial work of Advanced Powder Technology, which was founded as the International Journal of the Society of Powder Technology, Japan, is now shared by distinguished board members, who operate in a unique framework designed to respond to the increasing global demand for articles on not only powder and particles, but also on various materials produced from them. Advanced Powder Technology covers various areas, but a discussion of powder and particles is required in articles. Topics include: Production of powder and particulate materials in gases and liquids(nanoparticles, fine ceramics, pharmaceuticals, novel functional materials, etc.); Aerosol and colloidal processing; Powder and particle characterization; Dynamics and phenomena; Calculation and simulation (CFD, DEM, Monte Carlo method, population balance, etc.); Measurement and control of powder processes; Particle modification; Comminution; Powder handling and operations (storage, transport, granulation, separation, fluidization, etc.)
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