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Modelling fouling induction periods


Reference:

Yang, M., Young, A., Niyetkaliyev, A. and Crittenden, B., 2012. Modelling fouling induction periods. International Journal of Thermal Sciences, 51, pp. 175-183.

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    Official URL:

    http://dx.doi.org/10.1016/j.ijthermalsci.2011.08.008

    Abstract

    A fouling process is often preceded by an induction period in which no significant fouling is observed. In this paper, a simple lumped parameter model based on fractional surface coverage has been developed to correlate experimental data in the induction period. The model assumes that active foulant species stick to the surface and gradually cover it, the rate of change of surface coverage d/dt being proportional to the fractional free surface (1 - ). It is further assumed that the foulant already on the surface acts as a seed, attracting more foulant in a micro-growth manner such that the growth rate is first order in with a rate constant k 1. Adopting the concept of removal mechanism similar to that used in adsorption science, the removal rate of the coverage is set to be proportional to the coverage with a rate constant of k 2. The three assumptions are combined to obtain the relationship d/dt = k 1 (1 - ) - k 2 . The fouling layer grows on the covered surface and the fouling rate can be expressed as R f where R f can be any established fouling rate expression. Experimental data, including data obtained during induction periods have been successfully correlated for systems including crude oil fouling, water scaling and whey protein fouling. The physical meanings of the model parameters are discussed. The model supports experimental observations in which shorter induction periods are found with higher surface temperatures. The effects of the surface material and the flow velocity are also analysed.

    Details

    Item Type Articles
    CreatorsYang, M., Young, A., Niyetkaliyev, A. and Crittenden, B.
    DOI10.1016/j.ijthermalsci.2011.08.008
    DepartmentsFaculty of Engineering & Design > Chemical Engineering
    Publisher StatementYang_IJTS_2011.pdf: NOTICE: this is the author’s version of a work that was accepted for publication in International Journal of Thermal Sciences. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in International Journal of Thermal Sciences, vol 51, 2012, DOI 10.1016/j.ijthermalsci.2011.08.008; Yang_IJTS_2011.doc: NOTICE: this is the author’s version of a work that was accepted for publication in International Journal of Thermal Sciences. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in International Journal of Thermal Sciences, vol 51, 2012, DOI 10.1016/j.ijthermalsci.2011.08.008
    RefereedYes
    StatusPublished
    ID Code26169

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