Rheological Behaviour of Granular Material

Abstract

INSTRUMENTS normally used for measuring viscosity are used from time to time for studying the flow properties of granular materials, especially rotational viscometers. Wieghardt¹ used, for sand, a large rotating cylindrical vessel, and measured the torque on a partly immersed long, smooth metal cylinder of small diameter. Benarie², working with powders, made use of an ordinary visco-meter with a rotating bob, which had radially arranged baffles to avoid slippage. Kuno and Kurihara³ in similar work used a MacMichael viscometer, rotating the outer cylinder, which also had baffles.