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Maldistribution is known to reduce the effectiveness of heat exchangers.
When hot, low velocity regions are created behind baffles or at the
periphery of a tube bundle there can be a significant increase in
fouling rate that further reduces performance. By using local, scalar,
radial and axial models for heat transfer and pressure drop we can build
3-dimensional CFD models of the shell-side to get a good estimation of
exchanger performance. By using the well known and simple fouling model
of Ebert & Panchal (1992), we explore the effect of velocity and
temperature on shell-side crude-oil fouling. This provides a convenient
way of assessing improved geometries for fouling duties, or for
customising fouling models based on
plant operating data.
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