Investigations of flow instabilities within the dense pneumatic conveying system

A.J. Jaworski, Tomasz Dyakowski

Research output: Contribution to journalArticlepeer-review

84 Citations (Scopus)


The gas–solids flows in the dense pneumatic conveying exhibit many interesting features related to their three-dimensional and unsteady nature. The dominant characteristic in this type of flows is the appearance of discrete flow instabilities commonly known as ‘slugs’ and ‘plugs’. These are investigated by two techniques: a high-speed video camera and a twin-plane electrical capacitance tomography (ECT), and the results obtained are discussed. Data extracted from tomographic measurements can be processed and presented in several different ways to enable a better understanding of the flow behaviour. Several examples are given, including body shape type information, internal structure of the flow instabilities, their propagation velocity and frequency characteristics. A short case study, focused on measurements of bidirectional flow in a vertical channel, is presented.
Original languageEnglish
Pages (from-to)279-291
Number of pages13
JournalPowder Technology
Issue number2-3
Early online date3 Jan 2002
Publication statusPublished - 11 Jun 2002
Externally publishedYes


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