Red blood cells tend to aggregate in the presence of plasma proteins, forming structures known as rouleaux. Here, we derive a constitutive rheological model for human blood which accounts for the formation and dissociation of rouleaux using the generalized bracket formulation of nonequilibrium thermodynamics. Similar to the model derived by Owens and co-workers [“A non-homogeneous constitutive model for human blood. Part 1. Model derivation and steady flow,” J. Fluid Mech. 617, 327–354 (2008)] through polymer network theory, each rouleau in our model is represented as a dumbbell; the corresponding structural variable is the conformation tensor of the dumbbell. The kinetics of rouleau formation and dissociation is treated as in the work of Germann et al. [“Nonequilibrium thermodynamic modeling of the structure and rheology of concentrated wormlike micellar solutions,” J. Non-Newton. Fluid Mech. 196, 51–57 (2013)] by assuming a set of reversible reactions, each characterized by a forward and a reverse rate constant. The final set of evolution equations for the microstructure of each rouleau and the expression for the stress tensor turn out to be very similar to those of Owens and co-workers. However, by explicitly considering a mechanism for the formation and breakage of rouleaux, our model further provides expressions for the aggregation and disaggregation rates appearing in the final transport equations, which in the kinetic theory-based network model of Owens were absent and had to be specified separately. Despite this, the two models are found to provide similar descriptions of experimental data on the size distribution of rouleaux.
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March 2018
Research Article|
March 16 2018
A constitutive rheological model for agglomerating blood derived from nonequilibrium thermodynamics
Special Collection:
Papers from the 8th Meeting of the Hellenic Society of Rheology
Ioanna Ch. Tsimouri;
Ioanna Ch. Tsimouri
1
Department of Chemical Engineering, University of Patras and FORTH-ICE/HT
, Patras GR26504, Greece
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Pavlos S. Stephanou
;
Pavlos S. Stephanou
a)
1
Department of Chemical Engineering, University of Patras and FORTH-ICE/HT
, Patras GR26504, Greece
2
Department of Mathematics and Statistics, University of Cyprus
, P. O. Box 20537, 1678 Nicosia, Cyprus
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Vlasis G. Mavrantzas
Vlasis G. Mavrantzas
1
Department of Chemical Engineering, University of Patras and FORTH-ICE/HT
, Patras GR26504, Greece
3
Particle Technology Laboratory, Department of Mechanical and Process Engineering, Institute of Process Engineering, ETH Zurich
, Sonneggstrasse 3, CH-8092 Zürich, Switzerland
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a)
Author to whom correspondence should be addressed: stefanou.pavlos@ucy.ac.cy
Physics of Fluids 30, 030710 (2018)
Article history
Received:
November 22 2017
Accepted:
February 15 2018
Citation
Ioanna Ch. Tsimouri, Pavlos S. Stephanou, Vlasis G. Mavrantzas; A constitutive rheological model for agglomerating blood derived from nonequilibrium thermodynamics. Physics of Fluids 1 March 2018; 30 (3): 030710. https://doi.org/10.1063/1.5016913
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