Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 22 for “"Micromixing"”.
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Development of a micromixing system for treatment of ORL 48 microtissues in different concentrations of cytochalasin B
… higher complexity procedures and costly. Micromixing method provides a better platform that enables mixing and dilution of liquid-based reagents which is convenient solutions preparation, easy liquid handling and time-saving. In this study, a polydimethylsiloxane (PDMS) micromixer was …
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Turbulent mixing and chemical reaction in baffled stirred tank reactors : a comparison between experiments and a novel micromixing-based computational fluid dynamics model
… approach based on the use of CFD coupled with micromixing models was used to predict the behavior of a multiple, competitive reaction system in cylindrical stirred tank reactors fitted with a variety of agitators. In particular, the following fast parallel competing reactions scheme (Bourne and …
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Modeling and experimental validation of a single-feed semi-batch precipitation process
… studied and numerically predicted using a micromixing model based on CFD. A commercial CFD package (FLUENT) was used to simulate the flow field and predict the energy dissipation rate distributions within the reactor. The precipitation zone originated from the feed point was tracked using a …
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Annular Flow Synthesis and Assembly of Two-Dimensional Materials
… high speed fluorescence microscopy and chemical micromixing tests. By operating in the two-phase annular flow regime, it is possible to form microfilms with tuneable shear rates as high as ~1E6 s-1 and sub-millisecond micromixing. By synthesizing layered double hydroxides in this reactor over …
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Modeling and Simulation of Antisolvent Crystallization: Mixing and Control
… of an algorithm that couples macromixing and micromixing models with the population balance equation. It was applied to simulate antisolvent crystallization in a semibatch stirred vessel and an impinging jet crystallizer. The effects of the operational variables on the crystal size …
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Characterization of mixing in a coaxial jet mixer for nanoparticle fabrication
… mixing time based on the EDD model for turbulent micromixing in the jetting regime.
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Passive micromixers for DNA analysis using CFD modelling
… mixers, through a numerical study of different micromixing configuration. To accomplish this, a numerical study is conducted using computational fluid dynamics (CFD) approach using ANSYS Fluent and CFX Software for different geometries designed. Different geometric configuration were proposed …
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Mixing performance of a novel, continuous confined impinging jets mixer using competitive reactions
… effectiveness. The ultrasonic energy enhances micromixing of the fluid jet streams, which results in an overall mixing effectiveness improvements in different physical and chemical processes. In the competitive reactions system used here (third Bourne reaction), one stream containing sodium …
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Development of Micro to Milli-Scale Multiphase Reactors with and Without Solids for Integration Into Mini-Monoplants
… rules derived with the goal of maintaining mean micromixing performance. In this study, mean energy dissipation rates and relative contributions of chaotic flow were used as measures for the overall micromixing performance, with both being conserved or increased upon reactor scale-up when either …
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Mean reaction rate closures for nanoparticle formation in turbulent reacting flow
… using the interaction by exchange with the mean micromixing model (DQMoM-IEM) is studied in detail. An analytic expression is presented for the source terms and a filter function introduced to address issues of boundedness and singularity. Analytic integrals are presented for special cases of …
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Crystal growth and nucleation kinetics of diethylenetriammonium hexachlororhodate (III) salt
… is independent of the Reynolds number, either micromixing or mesomixing can become a rate limitation. At a sufficiently high Reynolds number neither micromixing nor mesomixing limits conversion and the system equilibrium becomes the limitation. In the CSTR, the system equilibrium limited …
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High fidelity simulations of electrokinetic phenomena in microfluidic devices
… including sample injection, separation, rapid micromixing, and miniaturized chemical and biochemical analysis and detection. This dissertation focuses on simulations of two electrokinetic phenomena, isotachophoresis (ITP) and electrokinetic instability (EKI). A set of coupled governing …
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Mixing at Low Reynolds Numbers by Vibrating Cantilevered Ionic Polymers
… the development of a new generation of efficient micromixing devices, which will improve the capabilities and effectiveness of numerous microfluidic technologies that range across biomedical, lab-on-a-chip, separation and sorting technologies and many more.
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Bacteria At Oil-Water Interfaces
… has as yet unexplored implications for micromixing in nature.
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Microencapsulated phase change materials for thermal energy storage: development, evaluation, and application
… Heat transfer was found to increase due to the micromixing effect of particle movement. The MPCM then improves the fluid's effective specific heat capacity due to the latent heat effect. Various forms of PCM were incorporated within gypsum wallboard for the application of TES in buildings. The …
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Pharmaceutical crystallization design using micromixers, multiphase flow, and controlled dynamic operations
… and shape. An alternative design replaces the micromixing with the application of ultrasonication to decouple nucleation and flow rates. Based on these nucleation methods, a novel continuous crystallizer is designed where the slurry flow is combined with an air flow to induce a multiphase …
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The role of lipid in malaria pigment (Haemozoin) formation under biomimetic conditions
… mixed by means of vortexing, ultrasonication or micromixing before being used for β-haematin formation reactions. The β-haematin crystals formed at the emulsion layer as well as lipid droplets were characterized by TEM, TEM-ED and ESI/EELS and were compared to Hz. β-Haematin crystals formed …
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Quantifying microbubble streaming and its applications
… in microfluidics. We first analyze the micromixing between two fluid streams continuously transported through the channel by a Poiseuille flow, whose mixing properties are enhanced by an array of acoustically excited bubbles located at the channel walls. We argue that in order to achieve …
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Multiscale continuum simulations of fluidization : bubbles, mixing dynamics and reactor scaling
… model, based on the local bubble-induced micromixing driven by solids upflow around the bubble nose and wake regions and downflow along its sides, has been developed for scaling the gross solids circulation by integrating over the bubble size and spatial distribution. Moreover, reduced …
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Crystalization studies in hollow fiber devices
… radial mixing and hence the production of good micromixing. By proper rating they can potentially be utilized for reaction purposes, especially for liquid-liquid reactions on a 1:1 stoichiometric ratio, a task never performed before in membrane reactors. Porous hollow fiber emulsion …
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