Flow regime effects on the spreading rate of a nylon fiber suspension jet in a rectangular channel

摘要

A fiber suspension jet was symmetrically introduced to a dilution water flow in a rectangular Plexiglas test section.The fiber suspension was disrupted by a flow restriction located in the nozzle prior to the mixing region.Digital imaging was used to observe the behavior and growth of the mixing layer,which was correlated to the pressure drop across the restriction,The growth of the shear layer was affected primarily by the difference in velocity between the fiber suspension flow and the dilution water flow,when the fiber suspension jet was highly turbulent.Finally,the mixing layer became less uniform with an increase in fiber length and suspension concentration and with a decrease in the pressure drop across the flow restriction.