Validation of the granular temperature prediction of the kinetic theory of granular flow by particle image velocimetry and discrete particle model

N.G. Deen, W. Dijkhuizen, G.A. Bokkers, M. van Sint Annaland, J.A.M. Kuipers

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    In order to give a detailed description of the hydrodynamics in large industrial scale fluidized beds, continuum models are required. Continuum models often use the kinetic theory of granular flow (KTGF) to provide closure equations for the internal momentum transport in the particulate phase. In this work the outcome of the continuum model is compared with both an experimental technique and detailed simulations, i.e. particle image velocimetry (PIV) and the discrete particle model (DPM). PIV is used for the measurement of an instantaneous velocity field of the flow in the front plane of a fluid bed. The classical PIV analysis is extended to enable the measurement of the local velocity fluctuations in the interrogation area, i.e. the granular temperature. In the DPM, each particle is tracked individually. In this model detailed collision models can be incorporated, rendering the DPM a valuable research tool to validate the underlying assumptions in the KTGF concerning the particle-particle interactions and the particle velocity distribution functions. The aforementioned experimental and numerical techniques are used to measure the granular temperature distribution around a single bubble rising in a gas-fluidized bed. It was found that the results of PIV and the DPM are very similar. Although the initial bubble shape and size are well predicted by the continuum model, it fails once the bubble has detached from the bottom plate. Further research in the area of KTGF closures is needed to improve the predictions of the TFM.
    Original languageUndefined
    Title of host publicationProceedings of the 3rd Int. Symposium on Two-Phase flow Modelling and experimentation
    Place of PublicationPisa
    Number of pages8
    Publication statusPublished - 22 Sept 2004
    EventThird International Symposium on Two-Phase Flow Modelling and Experimentation - Pisa, Italy
    Duration: 1 Jan 20041 Jan 2004


    OtherThird International Symposium on Two-Phase Flow Modelling and Experimentation
    Other22-24 September 2004


    • METIS-222263
    • IR-49634

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