We describe measurement and interpretation of the force acting on a smooth hydrophilic glass particle during rapid (1 - 100 mms -1) approach to, and separation from, a hydrophilic glass plate in viscous concentrated aqueous sucrose solutions (0:001 Pas <rη< 0.090 Pas). We find that the force is accurately described by Reynolds lubrication theory with a no-slip boundary condition, even at maximum strain rates of up to 250 000 s-1. Compared to earlier studies of hydrodynamic forces on small particles, we reduce the uncertainty in the absolute particle-plate separation by using an evanescent-wave measurement of the separation.
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Honig et al. (2011) studied this question.