FN Archimer Export Format
PT J
TI A new rheological model for thixoelastic materials in subaqueous gravity driven flows
BT 
AF Hermidas, Navid
   Silva Jacinto, Ricardo
   Eggenhuisen, Joris T.
   Luthi, Stefan M.
AS 1:1;2:2;3:3;4:1;
FF 1:;2:PDG-REM-GM-LGS;3:;4:;
C1 Faculty of Civil Engineering and Geosciences, TU Delft, Delft, Netherlands
   Marine Geosciences Unit, Ifremer, Brest, France
   Department of Earth Sciences, Utrecht University, Utrecht, Netherlands
C2 UNIV DELFT, NETHERLANDS
   IFREMER, FRANCE
   UNIV UTRECHT, NETHERLANDS
SI BREST
SE PDG-REM-GM-LGS
IN WOS Ifremer UPR
   copubli-europe
IF 2.538
TC 7
UR https://archimer.ifremer.fr/doc/00483/59497/62365.pdf
LA English
DT Article
DE ;Gravity flow;Thixotropy;Clay suspension;Viscosity bifurcation
AB A new viscoelastic constitutive model for subaqueous clay-rich gravity flows is presented. It is explained that for the materials which exhibit a minimum in their strain controlled flow curves the structure parameter must be a symmetric function of strain rate and stress. Therefore, the destruction of structure within the material is modeled using the dissipation energy. An expression for the elastic strain of the flowing structure is derived. The final set of equations can reproduce the viscosity bifurcation that clay suspensions may exhibit under a given load. This is explained to be important for prediction of the run-out distance of clay-rich gravity flows. The ability of the model to reproduce the general response of pasty materials to step stress and step shear rate tests is examined. The model requires four empirical parameters. A methodology is presented for obtaining these parameters and power law functions are given for their calculations for a limited rest time of 3000 seconds. The ability of the model to reproduce the rheological behavior that clay-rich suspensions exhibit under both stress and strain controlled conditions is examined using rheometry tests. 
PY 2019
PD APR
SO Journal Of Non-newtonian Fluid Mechanics
SN 0377-0257
PU Elsevier BV
VL 266
UT 000464296900009
BP 102
EP 117
DI 10.1016/j.jnnfm.2019.02.010
ID 59497
ER

EF