Fouling dynamics in suspension flows

A. Shakib-Manesh, J.A. Åströ, Antti Koponen, Pasi Raiskinmäki, J. Timonen

    Research output: Contribution to journalArticleScientificpeer-review

    2 Citations (Scopus)

    Abstract

    A particle suspension flowing in a channel in which fouling layers are allowed to form on the channel walls is investigated by numerical simulation.
    A two-dimensional phase diagram with at least four different behaviors is constructed. The fouling is modeled by attachment during collision with the deposits and by detachment caused by large enough hydrodynamic drag.
    For fixed total number of particles and small Reynolds numbers, the relevant parameters governing the fouling dynamics are the solid volume fraction of the suspension and the detachment drag force threshold. Below a critical curve in this 2D phase space only transient fouling takes place when the suspension is accelerated from rest by a pressure gradient.
    Above the fouling transition line, persistent fouling layers are formed via ballistic deposition for low and via homogeneous deposition for large solid volume fractions. Close to the fouling transition line, the flow path between the deposited layers meanders, while necking appears for increasing distance from the transition.
    Finally, another transition to a fully blocked flow path takes place. As determined by the estimated amount of deposited particles at saturation, both transitions seem to be discontinuous. Large fluctuations and long saturation times are typical of the dynamics of the system.
    Original languageEnglish
    Pages (from-to)97-102
    JournalEuropean Physical Journal E: Soft Matter
    Volume9
    Issue number1
    DOIs
    Publication statusPublished - 2002
    MoE publication typeA1 Journal article-refereed

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