{"title":"Experimental investigation and analysis of pressure fluctuations in pneumatic conveying systems with fine bulk solids","authors":"M. Dikty","doi":"10.1016/j.powtec.2025.120803","DOIUrl":null,"url":null,"abstract":"<div><div>When reducing the conveying gas velocity during the pneumatic transport of fine-grained bulk materials, the process goes through a wide variety of flow modes. Along this reduction in velocity, there are pressure fluctuations of varying degrees, the so-called pressure pulsations. These have been intensively studied over the past 30 years, mainly about the associated flow mode. In this work, the pressure pulsation is systematically investigated. For this purpose, conveying tests were carried out with cement as bulk solid and varying solid loadings and air mass flows, starting with the dilute mode, and ending with pipe blockage. The pressures were sampled and evaluated. Criteria for assessing pressure pulsations are applied. These are systematically related to the solid loading ratio (SLR), the Froude number (gas velocity) and the Euler number related to the pressure drop, based on a dimensional analysis. The resulting dependencies are evaluated qualitatively and quantitatively.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"456 ","pages":"Article 120803"},"PeriodicalIF":4.6000,"publicationDate":"2025-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Powder Technology","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0032591025001986","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
引用次数: 0
Abstract
When reducing the conveying gas velocity during the pneumatic transport of fine-grained bulk materials, the process goes through a wide variety of flow modes. Along this reduction in velocity, there are pressure fluctuations of varying degrees, the so-called pressure pulsations. These have been intensively studied over the past 30 years, mainly about the associated flow mode. In this work, the pressure pulsation is systematically investigated. For this purpose, conveying tests were carried out with cement as bulk solid and varying solid loadings and air mass flows, starting with the dilute mode, and ending with pipe blockage. The pressures were sampled and evaluated. Criteria for assessing pressure pulsations are applied. These are systematically related to the solid loading ratio (SLR), the Froude number (gas velocity) and the Euler number related to the pressure drop, based on a dimensional analysis. The resulting dependencies are evaluated qualitatively and quantitatively.
期刊介绍：
Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests:
Formation and synthesis of particles by precipitation and other methods.
Modification of particles by agglomeration, coating, comminution and attrition.
Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces).
Packing, failure, flow and permeability of assemblies of particles.
Particle-particle interactions and suspension rheology.
Handling and processing operations such as slurry flow, fluidization, pneumatic conveying.
Interactions between particles and their environment, including delivery of particulate products to the body.
Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters.
For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.
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