This paper is concerned with the interpretation of isostatic recovery data in terms of the flow properties of the earth's mantle. A hydrodynamic analysis is first presented that allows straightforward calculation of the relaxation time for isostatic recovery within a mantle in which the viscosity varies continuously with depth. However, it transpires that no curve of this type (i.e., choice of ...

We consider observational and theoretical estimates of the accretion disc viscosity parameter α. We find that in thin, fully-ionized discs, the best observational evidence suggests a typical range α ∼ 0.1 − 0.4, whereas the relevant numerical simulations tend to derive estimates for α which are an order of magnitude smaller. We discuss possible reasons for this apparent discrepancy.

T HE APPARENT RELATIVE VISCOSITY (ARV) of blood usually decreases as the hematocrit decreases. 4 However, the data described in the following report indicate that the ARV will increase if hematocrit is duced by exposure of blood to anticoagulants, like citrate, which induce erythrocyte shrinkage.5 A similar phenomenon has been reported by other workers,6 but appears to have attracted little not...

We review recent developments in the field of microrheometry and describe a new flexure-based microrheometer (FMR) that can make measurements of the steady shear viscosity of transparent or optically-opaque complex fluids using 1-10 μl samples. We document the complex microrheology that may arise in a typical consumer product such as a skin crème, when the microstructure of the multiphase mater...

Numerical simulations are used to compare the impact of internal fluid viscosity and membrane on an isolated tank-treading red blood cell. Both decrease frequency, with moderate changes in deformation inclination However, it is shown that frequencies from existing experiments only retrieved if accounted for, apparent shear-thinning membrane.

In this study, synthetic sulfonated polymers were used in order to enhance the rheological properties of drilling fluids. The capability of these polymers in reducing the effects of environmentally friendly, but harmful, pollutants such as cement, calcium chloride, gypsum as well as pH changes were investigated. In the present work, two sulfonated synthetic polymers, namely Polythin and Polydri...