10 research outputs found
A numerical tool for the simulation of a diesel spray "stabilized cool flame" reactor
Paper presented at the 6th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, South Africa, 30 June - 2 July, 2008.A numerical investigation of the turbulent, multi-component
and reactive flow-field that develops in a Stabilized Cool Flame
Diesel fuel spray evaporation system, using a Computational
Fluid Dynamics (CFD) code is presented. The physical and
chemical phenomena are described by solving the respective
mass, momentum, species, thermal and turbulent energy
conservation equations. A dedicated numerical model is
developed, based on the fitting parameter concept, in order to
describe in sufficient detail the thermo-chemical effects of cool
flame reactions. The model is based on physico-chemical
reasoning coupled with information from available
experimental data and chemical kinetics simulations. The
developed model is validated and evaluated by comparing CFD
predictions to experimental data from an atmospheric pressure,
evaporating Diesel spray, Stabilized Cool Flame reactor.
Temperature predictions are compared to measurements with
satisfactory agreement. Computational results are used to
obtain in-depth information about the complex flow-field
developing in such innovative devices.vk201
Numerical modelling of heat transfer in gypsum plasterboards exposed to fire
Paper presented at the 6th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, South Africa, 30 June - 2 July, 2008.A numerical code for the simulation of the one-dimensional
heat transfer through a commercially available gypsum board
exposed to fire is presented. A parametric study regarding the
physical properties of the gypsum is carried out. The
predictions obtained with the in-house developed code are in
good agreement with experimental data, when temperature
dependent physical properties are taken into account. The good
performance of gypsum boards under fire conditions, from the
fire safety point of view, due to the dehydration/calcination
process and the occurring energy absorption is pointed out by
the numerical results.vk201
Prevalence of Age-Related Macular Degeneration in Europe: The Past and the Future
Purpose Age-related macular degeneration (AMD) is a frequent, complex disorder in elderly of European ancestry. Risk profiles and treatment options have changed considerably over the years, which may have affected disease prevalence and outcome. We determined the prevalence of early and late AMD in Europe from 1990 to 2013 using the European Eye Epidemiology (E3) consortium, and made projections for the future. Design Meta-analysis of prevalence data. Participants A total of 42 080 individuals 40 years of age and older participating in 14 population-based cohorts from 10 countries in Europe. Methods AMD was diagnosed based on fundus photographs using the Rotterdam Classification. Prevalence of early and late AMD was calculated using random-effects meta-analysis stratified for age, birth cohort, gender, geographic region, and time period of the study. Best-corrected visual acuity (BCVA) was compared between late AMD subtypes; geographic atrophy (GA) and choroidal neovascularization (CNV). Main Outcome Measures Prevalence of early and late AMD, BCVA, and number of AMD cases. Results Prevalence of early AMD increased from 3.5% (95% confidence interval [CI] 2.1%–5.0%) in those aged 55–59 years to 17.6% (95%
Shell-side flow in a model disc-and-doughnut heat exchanger
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