Graduate Thesis Or Dissertation
 

Sources of flow maldistribution in microreactor-assisted synthesis of ceria nanoparticles

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  • Recent efforts show that microchannel technologies have much to offer the field of nanomanufacturing: the structuring of matter on the order of one billionth of a meter. During the synthesis of nanomaterials, microchannel reactors take advantage of large surface-to-volume ratios to accelerate heat and mass transport. This accelerated transport allows for rapid changes in reaction temperatures and concentrations leading to faster, more uniform heating, cooling and mixing. This dissertation includes five chapters. Chapter 2 provides a comparison of conventional batch mixing and microchannel mixing (Tee-mixer) techniques for the synthesis of cerium oxide (ceria) nanoparticles. Results demonstrate the advantages of the micromixer approach including better control of nanoparticle shape and composition. Chapters 3 and 4 consider the scale-up of such nanomaterials for enabling new forms of microreactor-assisted nanomanufacturing. At flow volumes necessary for supporting nanomanufacturing, one of the key challenges in microreactor-assisted processing is flow maldistribution within microchannel components. Chapter 3 summarizes various mechanically-induced failure mechanisms known to impact flow maldistribution within microchannel arrays. In Chapter 4, one of these failure mechanisms is studied in more detail. Microchannel fin buckling has been observed during diffusion bonding due to the compressive stress caused by the lateral translation of the bonding pressure via Poisson’s ratio. A theoretical model is described and validated using experimental results. Implications of the theoretical model are discussed.
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