Chemical and Biomolecular Engineering - Research Publications
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ItemAgglomeration Regimes of Particles under a Linear Laminar Flow: A Numerical Study(MDPI, 2022-06)In this work, a combined smoothed particle hydrodynamics and discrete element method (SPH-DEM) model was proposed to model particle agglomeration in a shear flow. The fluid was modeled with the SPH method and the solid particles with DEM. The system was governed by three fundamental dimensionless groups: the Reynolds number Re (1.5~150), which measured the effect of the hydrodynamics; the adhesion number Ad (6 × 10−5~6 × 10−3), which measured the inter-particle attraction; and the solid fraction α, which measured the concentration of particles. Based on these three dimensionless groups, several agglomeration regimes were found. Within these regimes, the aggregates could have different sizes and shapes that went from long thread-like structures to compact spheroids. The effect of the particle–particle interaction model was also investigated. The results were combined into ‘agglomeration maps’ that allowed for a quick determination of the agglomerate type once α, Re, Ad were known.
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ItemPredicting Transmembrane Pressure Rise from Biofouling Layer Compressibility and Permeability(WILEY-V C H VERLAG GMBH, 2018-01)Abstract The operation of filtration membranes for wastewater treatment is severely affected by biofouling formation, which causes a rapid increase in transmembrane pressure (TMP) in constant rate filtration. The TMP rise is often attributed to particulate fouling within the membrane, but the external fouling layer or filter cake contributes significantly. The fouling is highly compressible, so any model must incorporate cake compression. A one‐dimensional controlled rate model based on compressible cakes and accurate sludge properties is proposed to predict the TMP rise needed to maintain constant flux. Increased compressibility results in more rapid TMP rise. Model predictions were compared to pilot‐plant data and showed good correlation, without assuming fouling within the membrane. Optimization of cycle times and flux rates are performed.
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ItemA non-linear viscoelastic model for sediments flocculated in the presence of seawater salts(ELSEVIER, 2015-10-05)
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ItemCompressive strength and capillary pressure: competing properties of compressible sediments that determine breakthrough pressure(Filtech Exhibitions Germany, 2012)