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Showing 1 to 20 of 20 for “"capillary rise"”.
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Capillarity in lithographically patterned micro channels
The spontaneous capillary-driven filling of micro channels is important for a wide range of applications. Reporting for the first time for vertically mounted open top channels, in this work the theory for capillary rise in channels of rectangular cross-section has been tested and verified, taking …
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A GENERAL MODEL FOR MULTIPHASE MIXTURES AND APPLICATIONS
… The concepts of pressure of a fluid phase and capillary pressure between two fluid phases are discussed. In particular, an attempt is made to interpret the capillary pressure defined here in the same manner as in the classical literature on porous media, i.e. as resulting from the surface …
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Experimental Study of Meniscus Thin-Film Evaporation in a Horizontal-Tube, Falling-Film Heat Exchanger, Focusing on Dynamic Contact Angle Variation of an Advancing Meniscus
… and evaporation heat transfer by exploiting the capillary pumping of the porous matrix, which worked to passively spread the solution fluid across the entire tube surface. The thin film created in the many menisci in the porous layer worked to further enhance evaporation due to the lowering …
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Mechanics of Liquid Transport and Swelling in Porous Media
… 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 media. Finally, a coupled diffusion-actuation framework is developed in 1D to predict the water-induced …
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Experimental determination of the flow parameters involved in moisture migration through fiberglass insulation materials
… liquid water in saturated fiberglass insulation. Capillary forces, originally thought to play a significant role in the movement of liquid water through fiberglass insulation, were found to be negligible. Capillary rise up a column of insulation measured no higher than 13 mm.
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Capillary flows in flexible structures
Interactions between capillary and elastic effects are relevant to a variety of applications, from micro- and nano-scale manufacturing to biological systems. In this thesis, we investigate capillary flows in extremely flexible, millimeter-scale cylindrical elastic tubes. We demonstrate that surface …
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The physical properties, water sensitivity and long term durability performance of vegetal concrete
… the concrete. The first part of the work characterised 24 different mixes made up of different binders (hydrated lime, metakaolin and Vicat natural hydraulic lime), bio-aggregate types (hemp and rapeseed straw), a linseed oil pre-treatment and a polyacrylic acid-based viscosity modifying admixture …
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Modeling of water table profile for a subirrigation system and evaluation of reliability of drainmod for the Lower Fraser Valley
… was observed. A linear relationship between capillary rise and water table elevation was observed.
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The effect of pore size and porosity on capillary pressure in microporous hydroxyapatite samples
… the improvement is thought to be in part due to capillary forces induced by the micropores. The micropore-induced capillary forces can self load cells into the scaffolds. In this study, the effect of micropore size and porosity on capillary forces was investigated. Rectangular shaped HA samples …
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Deactivation and preparation of fused silica open tubular columns for gas and supercritical fluid chromatography
The activity and wettability of raw fused silica capillary tubing was found to be widely variable which places severe limitations on the reproducibility of column deactivation and inertness. Hydrothermal treatment of the raw fused silica with nitric acid was proven to be very effective for cleaning …
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Improvements and reliability of MIT tensiometers and studies on soil moisture characteristic curves
… the environment. Only comparative study was by capillary rise tests. Numerous parameters that affect the experiments, such as compaction and heterogeneity of the specimen, data acquisition cables, mass balance sensitivity and temperature of the environment, were discovered and their effects were …
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Insights into the Mechanisms of Metal Oxide and Cationic Antimicrobials
… section of this work focused on the effect of capillary geometry on the height of capillary rise. Angled capillaries are common in natural and engineered systems such as porous media. However, this system has not been studied by experiment or modelling. The goal of this section is to examine …
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Polymer Infiltration Under Extreme Confinement
… transition temperature to induce wicking. This Capillary Rise Infiltration (CaRI) of polymers into nanoparticle thin films is a promising method to create interesting biomimetic composites with enhanced material properties, but also raises important theoretical questions about confinement, …
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LEVERAGING CONFINEMENT AND SURFACE EFFECTS TO CONTROL POLYMER PHASE BEHAVIOR AND TRANSPORT PHENOMENA IN POLYMER-INFILTRATED NANOPARTICLE FILMS
… introduce a novel fabrication method, Sequential Capillary Rise Infiltration (SCaRI), which sequentially infiltrates individual polymers. We find that strong asymmetry in polymer-nanoparticle interactions can suppress macroscopic phase separation by inducing pore-scale segregation. In blends with …
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Tuning The Properties Of Soft Materials Through Extreme Nanoconfinement
… very different effects in similar systems. Capillary Rise Infiltration (CaRI) enables the fabrication of polymer-infiltrated nanoparticle (NP) films in which extreme nanoconfinement can be achieved. In this thesis, we first use CaRI films as the model system to study the glass transition of …
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Effect of surfactants and brine salinity and composition on spreading, wettability and flow behavior in gas-condensate reservoirs
… pendent drop shape analysis (DSA) technique and capillary rise techniques. Anionic and nonionic surfactants and nine multi-component brines varying in salinity as well as ten single-salt brines with two different salinities were tested. Oil-water relative permeabilities were generated by history …
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Measurement and modeling of fluid-fluid miscibility in multicomponent hydrocarbon systems
… using pendent drop shape analysis and capillary rise techniques. The quantities of fluids in the feed mixture have been varied during the experiments to investigate the compositional dependence of fluid-fluid miscibility. The miscibility conditions determined from the VIT technique …
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A Study on Supported Metal Catalysts Prepared from Colloidal Precursors
… physicochemical properties, they were characterised by a combination of Fourier transform infrared microspectroscopy, solid-state ¹H, ¹³C, ²⁷Al, ²⁹Si, and ³¹P nuclear magnetic resonance spectroscopy, x-ray diffraction, x-ray fluorescence spectroscopy, scanning and transmission electron …
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Hydraulic Fracturing Behavior of Opalinus Shale: A Framework, Experimentation & Insights
… with the shale were thoroughly characterized. Capillary calculations showed a strong liquid affinity to the shale, resulting in significant and rapid capillary rise that minimizes the distance between the liquid front and the advancing fracture tip. Next, a novel series of indentation tests …
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Processes controlling the behavior of LNAPLs at groundwater surface water interfaces
… and 3. Zone 1 refers to the area below the water capillary fringe where LNAPL is a discontinuous nonwetting phase. Zone 2 refers to the area below the LNAPL capillary fringe where LNAPL is a continuous nonwetting phase. Zone 3 refers to the area above the LNAPL capillary fringe where LNAPL is a …