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 13 of 13 for “"Entry pressure"”.
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Advancing hydrophobic desalination membranes using initiated chemical vapor deposition (iCVD) v/
… on MD membranes. These include high liquid entry pressure (LEP) and high permeability to water vapor. There are many available manufacturing methods for producing hydrophobic membranes. An important subset of these methods use surface modification to prepare hydrophobic composite membranes. …
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Effects of Multi-walled Carbon Nanotubes (MWCNTs) and Integrated MWCNTs/SiO2 Additives on Polymeric PVDF Membrane for Membrane Distillation
… roughness without extreme compromise of liquid entry pressure of water (LEPw), which could reach up to 72 psi. Further integration of MWCNTs with a small amount of SiO2 nanoparticles (NPs) showed a synergic effect resulting in further improvement of VMD flux due primarily to the increase in …
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Capillary Pressure Effects in the Geological Storage of Carbon Dioxide
… layers are continuous and have a capillary entry pressure. We show that discrete pools of CO2 may form below the mudstone horizons and that the pool depth is a function of both the capillary entry pressure and the flux of CO2 into a given layer. We assume that the maximum pool depth before …
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Study on Structure and Vacuum Membrane Distillation Performance of PVDF Composite Membranes: Influence of Molecular Weight and Blending
… measurement, contact angle (CA) and liquid entry pressure of water (LEPw) measurement, and further subjected to vacuum membrane distillation (VMD) in a scenario that was applicable for cooling processes, where the feed water temperature was maintained at 27℃. It was found that PVDF …
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On-line shear and extensional rheometry of polymer melts in the extrusion process.
… was investigated. In-line shear stress and entry pressure measurements showed a reasonable correlation with on-line rheometry. A study of entry flows in the OLR using capillary dies approaching orifice showed non-linearities occurred at very low capillary length to diameter(L:D) ratios, and …
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On-line shear and extensional rheometry of polymer melts in the extrusion process.
… was investigated. In‑line shear stress and entry pressure measurements showed a reasonable correlation with on‑line rheometry. A study of entry flows in the OLR using capillary dies approaching orifice showed that non‑linearities occurred at very low capillary length‑to‑diameter (L:D) …
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Flow and Distribution of Water in Fractional Wettability Unsaturated Porous Media
… In this research, mm- and cm-scale capillary pressure¡Vwater content experiments and computed x-ray microtomography (CMT) were used to obtain quantitative data describing drainage and the irreducible water distribution in fractionally-wet systems. The findings from this research showed that …
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The mechanisms involved during the desaturation process of a porous matrix
… been argued to be a function of negative pore pressure or matric suction. All the unsaturated soil behavioral issues contain a single underlying question; what is the nature of soil suction? Nature refers to the physical phenomenon that generates soil suction and changes with environmental …
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Pore Wetting in Desalination of Brine Using Membrane Distillation Process
… reverse osmosis is one of the state-of-the-art pressure-driven membrane desalination technologies, it is incapable of desalinating high-salinity streams due to the very high osmotic pressure to overcome. Membrane distillation (MD) is one of the emerging methods, which has attracted much …
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Quantification of wildfire-induced perturbations to soil-water retention curves and their impact on rainfall runoff
… index, n, and the inverse of the air-entry pressure head, α. To date, the degree to which SWRCs are perturbed by wildfire is less clear, and as a result, they are commonly assumed to be unaffected by wildfire and obtained based on soil texture from databases composed of unburned …
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Modeling CO₂ leakage from geological storage formation and reducing the associated risk
… pathway in wells that exhibit sustained casing pressure (SCP) and the rate-limiting part of the leakage pathway in any wellbore that CO₂ might encounter. By using field observations of SCP to estimate transport properties of a CO₂ leakage pathway, we obtain a range of CO₂ fluxes for the cases of …
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Multi-scale Investigations of Geological Carbon Sequestration in Deep Saline Aquifers
… field. Relative permeability, capillary pressure-water saturation relation are important continuum-scale properties controlling multiphase flow in porous media. This work employed lattice Boltzmann method to simulate the displacement process. We found that pore-scale surface wettability …
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Characterization of microporous ECTFE membranes exposed to different liquid media and ?-radiation and nanoparticle microfiltration through such membranes
… defects in TOA-soaked membranes. Bubble-point-pressure (BPP) based maximum pore diameters of selected solvent-soaked ECTFE membranes are in good agreement with the pore size distribution estimated from AFM. Fourier transform infrared and Raman spectroscopies were used to study the …