Jenike shear cell alternatives

In annular shear cells which represent a commercial alternative to the Jenike shear cell), the shear stress is applied by rotating the top portion of annular shear box (see Fig. 18). These devices allow much larger shear distances to be covered both in sample... 

The limitations of the Jenike shear cell are that it is not very useful for measuring bulk solids with large shear deformations, e.g., plastic powders. The level of consolidation stresses required are inappropriate for pharmaceutical materials, and the quantity of material required is often beyond that available in the early stages of development. Alternative shear cells that have been used include annular shear cells (Nyquist and Brodin 1982 Irono and Pilpel 1982) and ring shear testers (Schulze 1996). 

Alternatives to the Jenike shear cell are the annular shear cell and the rotational shear cell, also called the powder rheometer. It has been reported (Freeman and Cooke, 2006) that powder rheometers are reliable, fast, and give results comparable to standard methods based on the Jenike shear cell. The objective of the exercise is to compare the standard Jenike method for limestone CRM 116 powder with a method using a powder rheometer. 

As with the Jenike cell, this process is time-consuming. Amidon and Houghton, " however, used a single yield locus with this cell for comparative purposes. Hiestand et al., ° in comparing this apparatus to the Jenike cell, claimed that this simple shear cell can be used to provide characterization of the unconfined yield strengths of powders. The results from the two devices are not identical. However, as much as the Hiestand device requires less powder and the consolidation step is more automated and consistent, it provides an inexpensive alternative to the Jenike-type cell to characterize pharmaceutical powders. Amidon and Houghton used the cell to examine the effect of moisture on the powder flow properties of microcrystalline cellulose. ... 

Generally, the annular shear cell is an acceptable alternative to the Jenike tester for engineering design. The advantages of the annular shear cell can be summarised as follows ... 

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