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 17 of 17 for “"cake layer"”.
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Modeling and interpreting the observed effects of ash on diesel particulate filter performance and regeneration
… across the substrate wall with soot and ash cake layer formation. DPF models are also used to investigate the process of ash transport and catalyst deactivation with increasing ash load level. DPF ash aging is found to have negative effect on passive regeneration due to the catalyst …
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A mechanistic study on the coupled organic and colloidal fouling of nanofiltration membranes
… increased hydraulic resistance of the mixed cake layer structure, hindered foulant diffusion due to interactions between solute concentration polarization (CP) layers, and changes in colloid surface properties due to organic adsorption. Additionally, a modified composite cell-model is …
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The nature of lubricant-derived ash-related emissions and their impact on diesel aftertreatment system performance
… inside the DPF channels, whether in a cake layer along the filter walls or packed in a plug at the rear of the channels, also plays a major role in influencing DPF pressure drop. Through a combined approach employing targeted experiments and theoretical models, explanations for the key …
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Performance and Fouling during Bioreactor Harvesting
… faces the feed stream, and the tighter barrier layer faces the permeate stream, has been investigated for bioreactor harvesting. The open surface contains pores up to 40 µm in diameter, while the tighter barrier layer has an average pore size of 0.4 µm. </p> <p>The filtration performance, …
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Screening of Microfiltration and Ultrafiltration Ceramic Membranes for Produced Water Treatment and Testing of Different Cleaning Methods
… operations conducted. It was found that the cake layer formation and at a lesser degree the intermediate blocking were the predominant fouling mechanisms which controlled the permeate flux of filtrations at all operating conditions tested.
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Characterizing ash properties and effects on Diesel Particulate Filter flow resistance
… chemistry on the flow resistance of both the ash cake layer and the filter substrate. The results of this and other research can support the optimization of operating conditions, regeneration strategies, and lubricant additive formulations for decreased system backpressure. Additionally, this …
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Development and application of a channel-scale exhaust after-treatment model
… observed non-uniform combustion of the soot cake layer and a reduction in filtration efficiency of the filter wall at high temperature. The extended model is shown to be able to better describe the elevated particulate emission during active regeneration in both the timing of particle …
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Synergistic effects of lubricant additive chemistry on ash properties impacting diesel particulate filter flow resistance and catalyst performance
… densities along the filter channel walls as a cake layer as well as the resultant end plugs in the rear of the filter channels. Through a combined approach of experiments and theoretical models, the link between the material properties and characteristics of ash derived from single additives as …
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Development of Aerobic Granular Sludge Membrane Bioreactor (AGMBR) to Mitigate Fouling
… jet easily sloughed off the developed membrane cake layer, eliminating the need for chemical cleaning. The AGMBR system achieved 98.7±1%, 99.7±0.5%, 50±30%, and 35±18% removal for organic matter, ammonia-nitrogen, total nitrogen, and phosphorus, respectively. Meganema and Thauera, responsible …
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The prediction of flux decline in cross-flow microfilters via three-dimensional fluid dynamic models of tortuous pore structure
… and subdued flux decline transitioning to cake layer development with steady-state flow. This flux behavior was consistent with experimental flux data. The fluid dynamic model was enhanced with particle-membrane electrostatic forces. The addition of such forces via Surface Element …
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A sponge-based moving bed bioreactor for micropollutant removal from municipal wastewater
… was mainly attributed to the deposited cake layer (76.5%), followed by the pore blocking (12.0%), clean membrane resistance (10.5%) and irreversible fouling (1.0%).
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Development of an automated plasmapheresis system for the treatment of sepsis
… the performance by reducing the formation of cake layer. In addition, the device should be fully automated in order to simplify the technology for the end user. Approach: Design using computer aided design employing different methods for producing secondary flow, investigate the impact of …
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Experimental Investigation on Different After-treatment Technologies for the Control of Pollutant Emissions from Automotive Diesel Engines.
… is reported in literature; conversely, a soot cake layer was taking place immediately. Finally, A-DOC technology was tested over NEDC. Reduction of NOx was found to be significantly high, especially during the urban driving; spontaneous release of stored NOx (without periodic rich regeneration …
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An investigation into the factors affecting the behaviour of Highway Filter Drains, with a particular emphasis on the Scottish Trunk Road Network
… Radar data to explore why stratified (clogged) layers evolve within some HFDs. Based on the results of this research, design and maintenance procedures were then identified to improve the performance of HFDs.Results established that Scottish trunk roads operate under variable catchment …
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Deckschichtbildung in Kapillarmembranen bei der Querstrom-Mikrofiltration und ihre Beeinflussung durch polymere Flockungsmittel
Die Querstrom-Mikrofiltration mit Kapillarmembranen kommt zunehmend in den Bereichen Lebensmittel-, Pharma-, Chemieindustrie sowie in der Umwelttechnik zum Einsatz. Eine vollständige Beschreibung der Deckschichtbildung innerhalb der Membrananlage ist jedoch noch nicht gelungen. Der erste Teil …
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Mechanism study of virus removal in membrane filtration and the application to improve virus removal
… permeate flux decrease with the pore blockage-cake filtration model, it was determined that HAdV-2 fouled the membrane and decreased the effective membrane pore size, leading to the enhanced virus removal and the decreased permeate flux. It was also found that, the aim of high virus removal …