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We study the pressure-driven flow of concentrated colloids confined in glassmicro-channels at the single particle level using fast confocal microscopy. Forchannel to particle size ratios $a/\bar{D} \lesssim 30$, the flow rate of thesuspended particles shows fluctuations. These turn into regular oscillationsfor higher confinements ($a/\bar{D} \simeq 20$). We present evidence to linkthese oscillations with the relative flow of solvent and particles (permeation)and the effect of confinement on shear thickening.

Velocity oscillations in confined channel flows of concentrated colloidal suspensions