Abstract
Secondary vortex enhancement was examined for fiber suspension flows containing bacteria cellulose fiber (BCF) at weight fractions from 0.07 to 0.28 wt%. BCFs were derived from nata de coco. These fluids have non-Newtonian properties even at low weight fraction of BCF. The channel used has a rectangular cross section and an abrupt contraction geometry. As a result, we found that the vortex becomes large as increasing flow rate for BCF suspensions, whereas it becomes small for a Newtonian fluid. The vortex size enhancement is probably caused by the increment of elongational viscosity of test fluid.
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