Pressure drop created by a sphere settling in a tube containing a fiber suspension

In this work we report some numerical data on the pressure drop/drag force relation for the flow of a fiber suspension past a sphere in a tube, to tes t an analytical result due to Brenner (1962), which was derived for a creep ing Newtonian flow. The numerical data are generated by a robust method bas ed on the CONNFFESSIT idea of Ottinger (1996) and the DAVSS of Sun et al. ( 1998), which does not rely on any closure approximation. The numerical data support Brenner's relation very well. (C) 1999 The Society of Rheology. [S 0148-6055(99)01606-X].