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Liquid andliquid/gasflowsthroughspacerfilledchannelswerestudiedusingParticleImagingVelocime- try (PIV)toprovideexperimentalsupportforvelocitydistributionsobtainedfromComputationalFluid Dynamics studiesavailableintheliterature.ItisshownthatPIVisasuitabletechniqueformeasuring velocity profilesinspacerfilledchannels,althoughcarehastobetakenwheninterpretingtheresults. PIV measurementswerecarriedoutforanentireflowcell(5cm×15 cm),asmallerareaofroughly 7mm×8mmandforasinglespacercell(2.5mm×3 mm).Theexperimentalresultsshowthatfluidflow is welldistributedacrosstheentireflowcellinthecaseofsingle-phaseflow.Therecordingsofthesingle spacer cellshowedthatliquidflowismainlyparalleltothespacerfilamentsandthereforethedirec- tion offlowchanges90◦ over theheightofthechannel.Introductionofairbubblesintroducedstrong local velocitygradients.Theliquidvelocityintwo-phaseflowsisshowntobemoreunsteadythanin the caseofsingle-phaseflow,whichisadvantageouswhentryingtopreventfoulingorconcentration polarization.
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