Bulletin
of the American Physical Society, 66th Annual Meeting of the APS Division of
Fluid Dynamics, Volume 58, Number 18, Sunday–Tuesday, November 24–26, 2013;
Pittsburgh, Pennsylvania
Session M28: Industrial Applications I,8:00 AM–9:57 AM, Tuesday, November 26,
2013, Room: Spirit of Pittsburgh Ballroom B/C
Numerical
simualtions of fouling in crude-oil processing
Junfeng Yang, Omar Matar
(Imperial College London)
Abstract
The
aims of this study are to achieve fundamental understanding of the transfer
processes underlying the development of a fouling layer on the inside of heat
exchangers used in crude-oil processing. The numerical models developed are
based on the solution of the mass and momentum conservation equations, coupled
to the energy transport equation. These are complemented by relations that
capture the dependence of the layer density, viscosity, and surface tension on
temperature.
In order to capture ageing effects, the thermal conductivity of the
layer is allowed to depend on temperature, and a functional form is chosen for
its viscosity that accounts for dynamic structure-building and destruction.
Importantly, a chemical equilibria model is used to model the phase behaviour
of the oil, and this is also coupled to the governing equations. The turbulence
in the fluid phase is modelled using large eddy simulations. Numerical
solutions of the model equations are obtained in a channel geometry using a
volume-of-fluid approach. Our results capture the complex fouling dynamics that
include phase separation, wall-layer deposition, and removal.
Full Text Source (Subscription or Fee): http://meetings.aps.org/Meeting/DFD13/Event/203973
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