Drag force on a floc in a flow field: two-layer model
Resource
CHEMICAL ENGINEERING SCIENCE 57(14), 2627-2633
Journal
Chemical Engineering Science
Pages
2627-2633
Date Issued
2002
Date
2002
Author(s)
Hsieh, Yu-Heng
DOI
246246/2006111501232995
Abstract
The behavior of a oc in a ow !eld is analyzed theoretically; in particular, the force it experienced is estimated. Here, a oc is simulated
by an entity having a two-layer type of structure, and its porous nature mimicked by varying the relative magnitudes of the permeability
of its inner layer and that of its outer layer. The results of numerical simulation reveal that, for the same volume-averaged permeability,
the drag coe6cient of a oc with a heterogeneous structure is always much larger than that of a oc with a homogeneous structure. This
is true regardless of the relative magnitudes of the permeability of the inner layer and that of the outer layer. The drag coe6cient of a
oc is mainly determined by the part having a less porous structure. We show that for the same volume-averaged permeability, the more
heterogeneous the structure of a oc is, the easier for the relation between the drag coe6cient and the Reynolds number to deviate from
a Stokes’ law-like correlation.
Subjects
floc
porous structure
drag coefficient
two-layer model
Publisher
Taipei:National Taiwan University Dept Chem Engn
Type
journal article
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