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 23 for “"liquid transport"”.
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Mechanics of Liquid Transport and Swelling in Porous Media
The mechanics of liquid transport in porous cellulose foam and in a dense random packing of glass spheres are studied in this thesis. Specifically, the capillary and diffusion mechanisms are investigated by critical experiments, and appropriate theoretical models are developed for both porous …
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Terahertz Methods for Investigating the Liquid Transport Characteristics in Porous Media
Liquid transport in porous media is an important phenomenon in many scientific and engineering fields. Investigating the liquid transport process is crucial for gaining a better understanding of various important industrial processes, such as the disintegration of pharmaceutical tablets as well as …
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Liquid transport mechanisms in cotton-polypropylene laminated nonwoven fabrics influencing pesticide penetration
… this research was to investigate and compare the liquid transport properties of cotton nonwoven laminates of varying cotton/polypropylene fiber content (80:20, 60:40, 40:60, by weight) with a 100% polypropylene fabric and a 100% polyethylene fabric. Capillary, pressure and impact penetration …
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Activation of Release by Hydration in Pharmaceutical Tablets Studied by Terahertz Pulsed Imaging
… the most common pharmaceutical dosage forms. The liquid ingress into a tablet is considered to be the first, and often rate-determining, step for tablet disintegration and subsequent drug dissolution. Even for tablets that do not disintegrate (e.g. sustained release tablets), hydration of the oral …
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Predictive Disintegration Process Modelling of Immediate Release Tablets Using Terahertz Technology
… (TPI) is employed to investigate the advancing liquid front during tablet hydration, capturing liquid transport kinetics and matrix evolution insights. To capture disintegration realistically, including matrix erosion often ignored in constrained setups, a novel open immersion cell was developed …
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Exoelectrogenic biofilm growth in shearing flows
… when a biofilm adheres to materials involved in liquid transport causing economic loss through corrosion and drag losses on ship hulls, and in oil and food distribution. Microorganisms interacting with surfaces under these open channel flows contend with high shear rates and active transport to …
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Additively Manufactured Bioinspired Microstructures for Active Surface Modification
… which hold promise for applications, such as liquid transport, self-cleaning, and anti-icing. However, the controllability of these microstructures remains an area requiring further exploration. This research explores the design, fabrication, and active control of 3D-printed bioinspired …
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Design and modeling of a high flux cooling device based on thin film evaporation from thin nanoporous membranes
… to address these thermal management needs is liquid vapor phase-change. In this thesis, we present a study into the design and modeling of a cooling device based on thin film evaporation from a nanoporous membrane supported on microchannels. The concept utilizes the capillary pressure …
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Nanoengineered surfaces for advanced thermal management
… while the thermal resistance associated with the liquid film thickness can be minimized. However, traditional thin film evaporation schemes such as jet impingement and sprays suffer from several limitations, such as high power consumption, complex flow patterns, and localized cooling. In this …
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The effect of surface roughness and surface finish on two-phase and single-phase heat transfer and pressure drop characteristics
… to control nucleation site density and capillary liquid transport. Experimental pool boiling studies demonstrated significant enhancements, with checkerboard structures achieving up to 56% improvement in critical heat flux (CHF) and ~730% increase in heat transfer coefficient (HTC) relative to …
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Phase-field modeling of liquids splitting between separating surfaces and its application to high-resolution roll-based printing technologies
… printing systems, controlled release of liquid ink to the substrate surface is achieved through the transport of the liquid ink through a series of ink transfer rollers in the form of splitting liquid bridges. An in-depth understanding of the liquid transport process through the ink …
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Fabrication of Thermal Management Devices using Thermal Spray Technology
… coatings act as wicks of the vapor chamber for liquid transport due to the capillary effect. Channels to enhance liquid flow were made in the porous copper coatings. Coated samples were made with porosity varying from 2 to 44 %, and groove width ranging from 0.16 to 0.53 mm. The capillary …
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Portable Microfluidic Platform Employing Young-Laplace Pumping For Multiplexed Lab-On-A-Chip Applications
… Young-Laplace pressure, which allows modifiable transport of fluids without external modules, making it an attractive approach for microfluidic applications. Using 3D-printing, a platform was developed that enables the distribution of specific liquid volumes onto a superhydrophobic chip that is …
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Computer simulation of liquid flow patterns on distillation trays
… out to improve the fundamental modelling of liquid flows on distillation trays. A mathematical model is presented based on the principles of computerised fluid dynamics. It models the liquid flow in the horizontal directions allowing for the effects of the vapour through the use of an …
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Unconventional Superconductivity in the Layered Iron Germanide YFe2Ge2
… dependence, which is an indication of non-Fermi-liquid behaviour. While superconductivity in YFe$_2$Ge$_2$ has been widely observed below $T_c \approx \SI{1.9}{\kelvin}$ in electric transport measurements, evidence of a bulk superconducting transition has proved elusive. This has prompted …
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Influence of surface tension and concentration of a non-ionic surfactant on the barrier effectiveness of a microporous polypropylene fabric for pesticide protective clothing
… (θ), made by a 5-<i>μ</i>L drop of each test liquid on the test fabric, were measured. Barrier effectiveness was evaluated from the capillary penetration, wicking, and wetting characteristics of the fabric using the surfactant solutions at various concentrations. Wetting characteristics were …
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Microwave-assisted pyrolysis of HDPE using an activated carbon bed
… of molecular masses that matched those of the liquid transport fuels petrol and diesel (C5–C21). The non-condensable gases that resulted were short-chain aliphatics that could be used as feedstock for the creation of new chemicals (such as virgin HDPE), or fuels such as natural gas and LPG. The …
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Micro and nanostructured surfaces for enhanced phase change heat transfer
… due to insufficient bubble removal, leading to liquid dry-out which severely limits the heat removal efficiency. To address this challenge, we propose to incorporate micro/nanostructures to stabilize and enhance two-phase microchannel flows. Towards this goal, this thesis focuses on fundamental …
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Dynamics and Statics of Three-Phase Contact Line
… either spontaneous or forced spreading of liquids on a solid surface, is a ubiquitous phenomenon in nature and can be observed by us on a daily basis, e.g., rain drops falling on a windshield and lubricants protecting our corneas. The study of wetting phenomena can be traced back to the …
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The Moisture Transport Properties of Cement Mortar under Salt Spray Deposition
The moisture transport properties of porous materials play a crucial role in building energy consumption and indoor thermal comfort. Due to the salt spray climate, the external boundary conditions of buildings in coastal areas differ significantly from those in inland regions. Under salt spray …
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