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1 International Journal of Applied Mechanics and Engineering

1 2003

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Normal stress differences in Couette flow of granular materials

Kumar J., Lakshmana Rao C., Massoudi M.

International Journal of Applied Mechanics and Engineering

2003

Vol. 8, no 1

5-16

Normal stress differences, a phenomenon which is exhibited by many non-Newtonian fluids or non-linear elastic materials, also arises in the Couette flow of granular materials. This problem is studied using a continuum model proposed by Rajagopal and Massoudi (1990). For a steady, fully developed condition, the governing equations were reduced to a system of coupled non-linear ordinary differential equations, and the resulting boundary value problem was solved numerically (Kumar et al., 2003). The expression for one of the normal stress differences is derived in this paper and from the values of volume fraction obtained in (Kumar et al., 2003), the normal stress difference is calculated. The effect of material parameters, i.e., dimensionless numbers on the normal stress difference is studied. It is observed that the distribution parameter, "B2" and the density parameter "P" affect the normal stress differences most.