Abstract
It is known that the colloidal dispersion of polystyrene spheres enhances the electrostatic repulsion among the spheres by deionized processing while it enhances the van der Waals attraction by electrolyte concentration. This report describes the experimental result on the flow of the dilute colloidal dispersion of the fine polystyrene spheres passing through a small orifice, where it is shown that the colloidal particles give a stability or an instability effect on the orifice flow depending on the electrolyte density. The measured flow rates fluctuate with strong electrostatic repulsion. The increase in the electrolyte density stabilizes the orifice flow, whereas excessively high electrolyte density causes instablity in flow rates.
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