Rheological state variables: A framework for viscosity parametrization in crystal-rich magmas

Particle sedimentation in a fluid at low Reynolds number: a generalization of hindered settling described by a two-phase continuum model

“…The bulk viscosity in the depleted layer may be 4 to 6 orders of magnitude smaller (cf. Costa et al 2009, Faroughi andHuber, 2023) than in the higher particle fraction suspension above and below it. Since the wavelength of the fastest growing RT instability is proportional to the cube root of this viscosity ratio, the low viscosity of the layer can be expected to promote a long wavelength instability leading to phase segregation on a scale that should be several orders of magnitude greater than the layer thickness.…”