Chemistry Reference
In-Depth Information
particles of various shapes and sizes up to several centimetres in length.
Rheological and structural changes due to processing were also studied.
That article also contains an overview on the UVP-PD methodology in
addition to details of the signal processing and statistical methods such
as low pass filtering of the velocity information obtained by the time
domain algorithm and singular value decomposition methods to deter-
mine the wall position by channel correlation. Young
et al.
(2008) show
measurements in fat suspensions of varying crystal content. Wiklund
and Stading (2008) show measurements in many different suspension
types including their acoustic properties.
3
.
1
.
3
.
5
University of California Davis, USA
The group started with magnetic resonance imaging-based flow profil-
ing and pressure drop for in-line rheometry including power law fitting
(McCarthy
et al.
, 1992), a technique described earlier by Sinton and
Chow (1991) for non-Newtonian fluids. Choi
et al.
(2002) compared
this technique with the UVP-PD method for corn syrup solution and to-
mato juice flow. Dogan
et al.
(2002) presented results on measured
properties of diced tomatoes suspended in tomato juice including yield
stress, consistency index and apparent wall slip. Dogan
et al.
(2003b)
investigated the flow of tomato concentrates with different solid content,
the shear-thinning behaviour with a yield stress being fitted to power
law and Casson models. In addition, the viscosity and plug radius (yield
stress) were also determined directly from the profile. Subsequently,
they (Dogan
et al.
, 2005a, 2005b) investigated chemically modified and
native cornstarch and polymer melt flows. Choi
et al.
(2005) described
the software and data processing procedure for the UVP-PD measure-
ments. Choi
et al.
(2006) reported on the in-line monitoring of tomato
concentrate during evaporation by measuring velocity profiles and sound
velocity, the latter being used for the determination of the concentra-
tion. Powell and Pfund (2005), in collaboration with the Battelle Pacific
Northwest National Laboratory, applied the UVP-PD method to the flow
of slurry suspensions.
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1
.
3
.
6
Pacific Northwest National Laboratory (U.S. Department
of Energy), Richland, USA
The UVP-related work started with Shekarriz and Sheen (1998) who
characterised the shear-thinning fluids by just fitting the power law
exponent
n
using the velocity profile and flow rate. Pfund
et al.
(2006)
investigated the flow of a non-Newtonian solution of Carbopol EZ-1
with sodium hydroxide, which forms a gel.
