Exchange relaxometry of flow at small Péclet numbers in a glass bead pack.
In this paper we consider low Péclet number flow in bead packs. A series of relaxation exchange experiments has been conducted and evaluated by ILT analysis. In the resulting correlation maps, we observed a collapse of the signal and a translation towards smaller relaxation times with increasing flow rates, as well as a signal tilt with respect to the diagonal. In the discussion of the phenomena we present a mathematical theory for relaxation exchange experiments that considers both diffusive and advective transport. We perform simulations based on this theory and discuss them with respect to the conducted experiments.
Macromolecular Chemistry, RWTH Aachen, Worringer Weg 1, D-52074 Aachen, Germany. olaru@itmc.rwth-aachen.de
Alexandra Maria
AM
Olaru
Julia
J
Kowalski
Vaishali
V
Sethi
Bernhard
B
Blümich
D003198:Computer Simulation; D005898:Glass / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008863:Microspheres; D008956:Models, Chemical; D012212:Rheology / Q000379:methods*