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A summary of numerical studies of the flow within
hydrocyclones is given in Table 1 for the period from
1982 onwards. This provides a compilation of many of
the major contributions to the study of hydrocyclone
fluid dynamics, although it may not be wholly comprehensive.
The major milestones and approaches are evident
in the papers cited. For example, it is evident from
the table that the application of full three-dimensional
modelling to the hydrocyclone is a recent advance of
only the last 5 years with early attempts being made by
Concha et al. (1998) and Slack and Boysan (1998).
Authors such as He et al. (1999) demonstrated that full
three-dimensional modelling is essential in order to
accurately model the hydrocyclone flow-field, as a result
of its inherent axial asymmetry. Clearly, the twodimensional
approach cannot capture axial flow-field
asymmetries, although progress was made with turbulence
and multiphase modelling as well as accounting forthe air-core interface for the two-dimensional approach.
Comparison of two-dimensional predictions as a function
of the turbulence model indicates a significant increase
in prediction accuracy as the turbulence model
order was increased, evident from predicted pressure
drops and axial and radial velocity profiles. It is clear
from predictions that the differential-stress turbulence
model (DSM) represents a lower bound of turbulence
modelling, appropriate for the hydrocyclone flow-field.
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