Print Email Facebook Twitter Effect of spacer configuration on hydraulic conditions using PIV Title Effect of spacer configuration on hydraulic conditions using PIV Author Haidari, A.H. (TU Delft Sanitary Engineering) Heijman, Sebastiaan (TU Delft Sanitary Engineering) van der Meer, W.G.J. (TU Delft Sanitary Engineering; Oasen; University of Twente) Date 2018-06-30 Abstract Making improvements to feed spacers of spiral-wound membrane (SWM) modules of reverse osmosis (RO) is a necessary step towards a wider application of these modules. This study sets out to evaluate the performance of six commercial feed spacers by comparing their actual velocity profiles and their pressure drop. Velocity profiles are obtained from Particle Image Velocimetry (PIV). Comparing images from PIV with corresponding friction losses revealed that the transition from steady to unsteady flow occurs at the moment when the incline of the friction factor changes from steep to slight. From the two types of spacers used, zigzag spacers showed a better distribution of flow than the cavity spacers did, but at the cost of higher pressure drop. The flow was in a straight line from inlet to outlet with zigzag spacers only at low Reynolds numbers and with cavity spacers for the entire studied range of Reynolds numbers. Additionally, results showed that hydraulic conditions in channels with cavity spacers are mainly affected by geometric characteristics of transverse filaments. The results from this study can be used to understand the effects of spacer geometry on the hydraulic conditions inside the feed channel and as a validation tool for computational modeling. Subject Feed spacerMembraneParticle Image VelocimetryPIVReverse osmosisSpiral wound modules To reference this document use: http://resolver.tudelft.nl/uuid:47aba0ad-07c0-4762-92d0-39ad44305845 DOI https://doi.org/10.1016/j.seppur.2018.01.022 ISSN 1383-5866 Source Separation and Purification Technology, 199, 9-19 Part of collection Institutional Repository Document type journal article Rights © 2018 A.H. Haidari, Sebastiaan Heijman, W.G.J. van der Meer Files PDF 1_s2.0_S1383586617336948_main.pdf 2.26 MB Close viewer /islandora/object/uuid:47aba0ad-07c0-4762-92d0-39ad44305845/datastream/OBJ/view