IFE Brage
Not a member yet
1015 research outputs found
Sort by
Emulsions in external electric fields
Get PDFWater is co-produced with crude oils, generally in the form of water-in-crude oil emulsions. The oil and water phases need to be separated before export. Separation is performed in gravity separators with the addition of chemical demulsifiers and, sometimes, with the application of an electric field by using an electrocoalescer. The present article reviews several aspects of electrocoalescence by considering the effect of the electric field from the molecular to a macroscopic scale: the oil-water interface, single drop effects, two drop interactions, and finally emulsions at laboratory scales. Experimental results together with Dissipative Particle Dynamics (DPD) simulation results are presented. The review begins with water-oil interface under an electric field and followed by single drop electrohydrodynamics. The electric field is shown to influence the adsorption of crude oil indigenous surface-active components (asphaltenes) due to the electrohydrodynamic (EHD) flows. The interactions between two droplets in the presence of electric field and the factors governing the drop-drop coalescence are discussed in detail. DPD simulations help to elucidate thin film breakup during (electro)-coalescence of two water droplets, where the oil film has drained out to nanometer thickness. The film is comprised of surfactant and demulsifier molecules, and the simulations capture the pores formation in the film when a DC field is applied. The results demonstrate influence of the molecular structure of the surfactant and demulsifier, and their interactions. The subsequent section describes experimental techniques to assess the resolution of crude oil emulsions at the laboratory scale. The focus is on low-field Nuclear Magnetic Resonance (LF-NMR) which allows a determination of various emulsion features such as the droplet size distribution (DSD) and the brine profile (variation of the concentration of water with the height of the emulsion sample) and their evolution with time. Application of the technique in emulsion treatment involving chemical demulsifiers and electric field is presented. The review concludes with description of commercial industrial electrocoalecers such as the Vessel Internal Electrostatic Coalescer (VIEC) and the Compact Electrostatic Coalescer (CEC).publishedVersio
Fluorescence Spectroscopy and Chemometrics: A Simple and Easy Way for the Monitoring of Fluoroquinolone Mixture Degradation
Get PDFpublishedVersio
Elucidating the Effects of the Composition on Hydrogen Sorption in TiVZrNbHf-Based High-Entropy Alloys
Get PDFpublishedVersio
A digital information model framework for uas-enabled bridge inspection
Get PDFoai:ife.brage.unit.no:11250/2828724publishedVersio
When Midway Won’t Do: The Curvilinear Relationship Between Intrinsic Motivation and Willingness to be Flexible
Get PDFIntrinsic motivation is held as critical for employees’ willingness to be flexible (WTBF). Yet empirical research suggests that employees who find work intrinsically satisfying could resist work changes. In this study, we predict that the relationship between intrinsic motivation and employees’ WTBF will become more positive as intrinsic motivation advances beyond moderate levels. We also examine the role developmental supervisor support plays in generating the critical threshold of intrinsic motivation needed for it to be positively related with WTBF. Our study provides insight into how and when intrinsic motivation increases employees’ WTBF and into the degree of developmental support needed to facilitate a positive relationship between these variables.acceptedVersio
Studies of the effect of melt spinning on the electrochemical properties of the AB2 Laves phase alloys
Get PDFpublishedVersio
