During the drying process, internal water migration is often the limiting
factor for the overall water transfer. In order to simulate a drying
process, an accurate determination of the water diffusivity (D) in
the material is always necessary. For biological products D is known
to be low and vary with moisture content (X) and temperature (T).
D=f(X,T) can be estimated from the fitting of moisture profiles determined
by non-intrusive NMR imaging. This work first presents the experimental
results obtained on paddy rice. The moisture profiles were measured
during the drying process using a Bruker AMX400 spectrometer, equipped
with a micro-imaging device at the H+ frequency of 400MHz. Four drying
experiments at two different air temperatures were performed. A constant
time imaging (CTI) technique proved to be useful to obtain the moisture
content map in a central slice section of the kernel with 3mm thickness,
allowing a spatial resolution of 0.1mm. This method provided access
to low moisture content and low water mobility data. Then a diffusive
model was developed using a cylindrical geometry, taking into consideration
the shrinkage during drying. Uni-dimensional water profiles from
axes of the elliptic section of the kernel were selected in order
to determine the diffusivity parameters of the drying model. � 2002
Elsevier Science B.V. All rights reserved.
%0 Journal Article
%1 Fri?as2002
%A Fri?as, J.M.
%A Foucat, L.
%A Bimbenet, J.J.
%A Bonazzi, C.
%C JRU of Food Process Engineering, Cemagref-ENSIA-INAPG-INRA, 1 Avenue
des Olympiades, 91744 Massy Cedex, France
%D 2002
%J Chemical Engineering Journal
%K Diffusivity, Moisture NMR, Parameter estimation phenomena, transport
%N 1-2
%P 173--178
%T Modeling of moisture profiles in paddy rice during drying mapped
with magnetic resonance imaging
%U http://www.scopus.com/scopus/inward/record.url?eid=2-s2.0-0037185921&partnerID=40&rel=R8.2.0
%V 86
%X During the drying process, internal water migration is often the limiting
factor for the overall water transfer. In order to simulate a drying
process, an accurate determination of the water diffusivity (D) in
the material is always necessary. For biological products D is known
to be low and vary with moisture content (X) and temperature (T).
D=f(X,T) can be estimated from the fitting of moisture profiles determined
by non-intrusive NMR imaging. This work first presents the experimental
results obtained on paddy rice. The moisture profiles were measured
during the drying process using a Bruker AMX400 spectrometer, equipped
with a micro-imaging device at the H+ frequency of 400MHz. Four drying
experiments at two different air temperatures were performed. A constant
time imaging (CTI) technique proved to be useful to obtain the moisture
content map in a central slice section of the kernel with 3mm thickness,
allowing a spatial resolution of 0.1mm. This method provided access
to low moisture content and low water mobility data. Then a diffusive
model was developed using a cylindrical geometry, taking into consideration
the shrinkage during drying. Uni-dimensional water profiles from
axes of the elliptic section of the kernel were selected in order
to determine the diffusivity parameters of the drying model. � 2002
Elsevier Science B.V. All rights reserved.
@article{Fri?as2002,
abstract = {During the drying process, internal water migration is often the limiting
factor for the overall water transfer. In order to simulate a drying
process, an accurate determination of the water diffusivity (D) in
the material is always necessary. For biological products D is known
to be low and vary with moisture content (X) and temperature (T).
D=f(X,T) can be estimated from the fitting of moisture profiles determined
by non-intrusive NMR imaging. This work first presents the experimental
results obtained on paddy rice. The moisture profiles were measured
during the drying process using a Bruker AMX400 spectrometer, equipped
with a micro-imaging device at the H+ frequency of 400MHz. Four drying
experiments at two different air temperatures were performed. A constant
time imaging (CTI) technique proved to be useful to obtain the moisture
content map in a central slice section of the kernel with 3mm thickness,
allowing a spatial resolution of 0.1mm. This method provided access
to low moisture content and low water mobility data. Then a diffusive
model was developed using a cylindrical geometry, taking into consideration
the shrinkage during drying. Uni-dimensional water profiles from
axes of the elliptic section of the kernel were selected in order
to determine the diffusivity parameters of the drying model. � 2002
Elsevier Science B.V. All rights reserved.},
added-at = {2012-12-19T21:37:51.000+0100},
address = {JRU of Food Process Engineering, Cemagref-ENSIA-INAPG-INRA, 1 Avenue
des Olympiades, 91744 Massy Cedex, France},
author = {Fri?as, J.M. and Foucat, L. and Bimbenet, J.J. and Bonazzi, C.},
biburl = {https://www.bibsonomy.org/bibtex/2fb94338d8a5151a2ea0d4a25c751a8ec/gruwel},
comment = {Cited By (since 1996): 9
Export Date: 25 September 2008
Source: Scopus},
interhash = {56d9814c6dbec19fb09f315ba4f91671},
intrahash = {fb94338d8a5151a2ea0d4a25c751a8ec},
journal = {Chemical Engineering Journal},
keywords = {Diffusivity, Moisture NMR, Parameter estimation phenomena, transport},
number = {1-2},
owner = {administrator},
pages = {173--178},
timestamp = {2012-12-19T21:37:54.000+0100},
title = {Modeling of moisture profiles in paddy rice during drying mapped
with magnetic resonance imaging},
url = {http://www.scopus.com/scopus/inward/record.url?eid=2-s2.0-0037185921&partnerID=40&rel=R8.2.0},
volume = 86,
year = 2002
}