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 68 for “"Evaporation rate"”.
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Effect of Thickener and Lowered Air Density on Spray Drop Formation and Evaporation Rate
Made available in DSpace on 2014-12-11T17:36:09Z (GMT). No. of bitstreams: 1 7412264.pdf: 4133007 bytes, checksum: b96bab0caceb0a58387759b575e3a79c (MD5) Previous issue date: 1973
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The effects of evaporation rate, solvent, and substrate on the surface segregation of block copolymers
… profiles of [PDMS/PSF] blends cast at several rates of solvent evaporation, and cast on several substrates were measured. Surface concentration profiles of poly(styrene-butadiene-styrene) poly(styrene-isoprene-styrene) [SIS] triblock [SBS] and copolymers cast at several rates of solvent …
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A study of solvent-rich environments for evaporation rate control in the extrusion spin coating process
… be improved through the reduction of solvent evaporation from the wafer surface. This research project evaluates improvements in coating uniformity resulting from the application of a low to moderate solvent concentration environment. At low dispense volumes of approximately 0.5ml, the …
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Effect of particles on evaporation of droplet containing particles
The evaporation of droplet containing insoluble particles has grown into an active area of research due to the needs for nanofluids for applications in heat transfer, combustion, and manufacturing desired micro/nano particles in the pharmaceutical industry. The evaporation of droplets containing …
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A study into the effects of spray and jet characteristics on flash evaporation system
Low temperature flash evaporation desalination is a separation system that isolates liquids from other materials when seawater or any fluid undergoes evaporation. Extreme flash evaporation occurs when a low heated liquid is injected into the vacuum area, where the pressure is far below the …
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A droplet evaporation model for high temperature and pressure spray applications
A zero-dimensional single droplet evaporation model, suitable for the high temperatures and high pressures encountered in diesel engines, has been developed, based on an extensive review of previous work on droplet evaporation. The new model includes the dependence of gas and liquid thermodynamic …
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Evaporation rates from emulsions stabilised by surfactants and nanoparticles
This thesis is concerned with the evaporation rates of emulsions stabilised by either surfactant molecules or nm-size solid particles. Understanding of the mechanisms of the evaporation process plus the control of the rate limiting step of each mechanism involved in such processes is important for …
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Evaporation of liquids from structured and non-structured mixtures
The work presented in this thesis describes the evaporation rates of a wide variety of samples obtained under a controlled gas flow using a gravimetric technique. Evaporation rates for pure liquids with vapour pressures ranging from 0.1 to 500 Torr, water contained in silica particles, …
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Evaporating crossflow sprays in gas-solid flows
… jets in gas-solid flows, especially on the spray evaporation rate within a gas-solid medium. A combined study of experiments and theoretical analysis has been carried out here to investigate the fundamental mechanism of evaporating Crossflow spray jets in gas-solid flows. In this study, in …
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Numerical Investigation on Shape Impact of Deformable Droplets on Evaporation and Combustion: Method Development and Characterization
… spray combustion, this dissertation explores the evaporation and combustion of an isolated droplet. Under a highly convective environment inside a gas combustor, due to imbalance of inertial and surface tension forces, the droplets of larger size in sprays exhibit notable deformations from …
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Numerical investigation of the combustion of liquid oxygen droplets in an environment of hydrogen under microgravity conditions
… using OpenFOAM as well as a coupled droplet evaporation model based on combining OpenFOAM results with the existing theoretical models have been developed to understand the species and temperature profiles near the droplet surface. The coupled droplet model estimates the droplet evaporation …
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The Detection and Identification of Explosives by Canines and Chemical Instrumentation
… The goal of this research is to use flux and evaporation rate to quantify the explosive odor that escapes from the OPMD compared to unconfined explosives. Preliminary data suggests that there is an exponential relationship between relative boiling point and evaporation rate. It has been …
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Modeling and experimental analysis of electrospinning bending region physics in determining fiber diameter for hydrophilic polymer solvent systems
… non-aqueous hydrophilic jets (including solvent evaporation and water absorption on the jet surface, radial diffusion, and axial advection), and the coupling between the mass and force balances that determines the final fiber diameter. The absorption and evaporation physics is validated by …
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Investigation of the impact of desalination on the salinity of the Persian Gulf
… Asia with arid climate. Because of this aridity, evaporation from the Gulf is extremely high (1.84 meters per year) and far exceeds the sum of freshwater inflow to the Gulf, mainly from precipitation and some from river flow. A residual circulation exists between the Gulf and the Indian Ocean such …
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Performance evaluation of a mechanical vapour compression desalination system
… top brine temperature (TBT), brine recirculation rate, compressor speed and brine concentration. The setup showed better performance with higher TBT, higher compressor speed and lower brine concentration. The brine recirculation rate influenced the performance a little. The highest performance …
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Impact of surface area and porosity on the cooling performance of evaporative cooling devices
… parameters that affect the cooling devices' evaporation rate and cooling performance. Both design parameters lack prior systematic testing that methodically varies levels of surface area and material porosity to understand their effects on these devices' cooling performance (e.g. maximum …
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A Molecular Dynamics Study of Sessile Droplet Evaporation
… dynamics simulations to investigate the evaporation process of nanosized droplets adsorbed on a substrate. Beads interacting with each other via Lennard-Jones (LJ) potentials are used to construct the simulation systems. The solid substrate contains 6 layers of beads forming a …
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Influence of forced convection on sessile droplet evaporation
Evaporation is a phase change process with potential for achieving large heat transfer rates under high air temperatures due to the latent heat of vaporization. Bioin-spired artificial perspiration systems can leverage the evaporation of sessile droplets to implement this effect for different …
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An investigation of concrete curing practice in the Cape Town area
… and sorptivity increased as the average evaporation rate increased.
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Estimation of evaporation of previously condensed hydrocarbons in a tunnel burn experiment
… materials on the chamber wall might be re-evaporated during a new burn; The objective of this thesis is to estimate the amount of evaporation/sublimation possible for different types of organic materials during burns in a tunnel. This was carried out theoretically and compared to measurements. …
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