chemical dispersion Articles

  • A Lagrangian dispersion model with chemical reactions

    A Lagrangian stochastic (single particle) model is modified in order to account for simple chemistry reactions and tested against measured wind tunnel data. These data refers to a reactive plume generated by a single point source of NO inside a turbulent grid flow doped with ozone. The comparisons were made at different distances from the emission considering all the substances involved in the ...


    By Inderscience Publishers

  • A fluctuating plume model for pollutants dispersion with chemical reactions

    A fluctuating plume model for pollutant dispersion is developed. The model is able to include chemical reactions, accounting for segregation. The model is tested against measured data in wind tunnel experiment, where NO is emitted from a source in an environment of ozone. The results are presented in terms of the plume centre line dispersion and cross sections at different distances. It is shown ...


    By Inderscience Publishers

  • Dispersion models in Greece

    Various dispersion models for passive pollutants, as well as heavy gases, are used in Greece for environmental impact applications. The models are based on degree of complexity, and range from simple Gaussian or box models to CFD approaches. The models are used for environmental impact studies in power installations, chemical facilities and for nuclear emergencies. Reflecting the author's ...


    By Inderscience Publishers

  • Dispersive Behavior of Nonswelling Clays

    This paper examines the possible factors that contribute to the dispersive behavior of compacted nonswelling clays and proposes the use of a synthetic organic stabilizing agent to reduce the dispersive tendency of such soils. Results of chemical tests on saturation extracts of the clays tested failed to identify them as piping susceptible. However, pinhole tests on statically compacted specimens ...


    By ASTM International

  • Bioethanol Dispersing as World Challenge

    Bioethanol dispersing finds broad application in a national economy as solvent, also it is applied in production of a butadiene, as fuel for rocket engines, car engines, antifreeze, etc., it is an important intermediate product of organic synthesis (in production of esters, celluloid, artificial silk, ethyl aldehyde, acetic acid, chloroform, ethyl oxide and other products). Ethanol contains ...


    By GlobeCore Blending

  • Chemical reactions at street scale using a Lagrangian particle dispersion model

    In the context of the FEDER AIRCITY project, Paris City is modelled with a 3 m resolution with the purpose of computing pollutant concentration relevant for human exposition. This project involves AIRPARIF (Ile-de-France Air Quality Monitoring Network), for emission and immission data, CEA (French Atomic and Alternative Energy Agency) for HPC availability, National Geographic Institute (IGN) for ...


    By Inderscience Publishers

  • Bioethanol dispersing – world challenge

    Bioethanol dispersing finds broad application in a national economy as solvent, also it is applied in production of a butadiene, as fuel for rocket engines, car engines, antifreeze, etc., it is an important intermediate product of organic synthesis (in production of esters, celluloid, artificial silk, ethyl aldehyde, acetic acid, chloroform, ethyl oxide and other products). Ethanol contains ...


    By GlobeCore GmbH

  • Characterising uncertainty in plume dispersion models

    For management decisions related to effects of releases of toxic chemicals, it is useful to consider not only the expected or most likely impact of the release, but also the envelope of possible outcomes, the latter of which involves an assessment of the uncertainty in the modelling results. In this paper, we provide quantitative estimates of major sources of uncertainty in plume dispersion ...


    By Inderscience Publishers

  • Any liquid dispersing without foliation

    Dispersion is a process when small parts of one substance are distributed in thin liquid of another substance, without being dissolved in it. Such fluid call dispersing. In dispersion it is thin parts of substance is distributed in liquid part over time is depositing, and there comes the partial foliation. Therefore components of dispersion should be passed through GlobeCoreblending system ...


    By GlobeCore Blending

  • Any liquid dispersing without foliation

    Dispersion is a process when small parts of one substance are distributed in thin liquid of another substance, without being dissolved in it. Such fluid call dispersing. In dispersion it is thin parts of substance is distributed in liquid part over time is depositing, and there comes the partial foliation. Therefore components of dispersion should be passed through GlobeCoreblending system ...


    By GlobeCore Blending

  • Understanding and Adapting to New Dispersion Models

    The U.S. Environmental Protection Agency (EPA) has proposed revisions to its air dispersion modeling guidance1 (“Guideline on Air Quality Models”, or simply “Guideline”), found in 40 CFR 51 Appendix W.2 These revisions, once finalized, will create significant changes in the way that air quality analyses are performed in the US, and perhaps the most significant changes since the Guideline was ...


    By Trinity Consultants

  • Acute toxicity of chemically and mechanically dispersed crude oil on juvenile sea bass (Dicentrarchus labrax): Absence of synergistic effects between oil and dispersants

    The goal of this experiment was to assess the relative acute toxicities of mechanically and chemically dispersed oil (Crude Arabian Light) in controlled conditions. Juvenile sea bass (Dicentrarchus labrax) were exposed to four commercial formulations of dispersants (Corexit EC9500A, Dasic Slickgone NS, Finasol OSR 52, Inipol IP 90), to mechanically dispersed oil and to the corresponding ...


    By John Wiley & Sons, Ltd.

  • Atmospheric dispersion and chemical pollutant transformation simulated with parallel calculations using two PC clusters

    The numerical simulation of atmospheric pollution needs long calculation times, mainly due to the chemistry involved, for example in photochemical episodes for which a lot of species and reactions must be taken into account. Parallelisation can reduce these calculation times. In this work, we have made parallel computation with a Eulerian transport/chemical model with the MPI communication ...


    By Inderscience Publishers

  • Toxicity of crude oil chemically dispersed in a wave tank to embryos of Atlantic herring (Clupea harengus)

    Tests of crude oil toxicity to fish are often chronic, exposing embryos from fertilization to hatch to oil solutions prepared using standard mixing procedures. However, during oil spills, fish are not often exposed for long periods and the dynamic nature of the ocean is not easily replicated in the lab. Our objective was to determine if brief exposures of Atlantic herring (Clupea harengus) ...


    By John Wiley & Sons, Ltd.

  • Oil droplet ingestion and oil fouling in the copepod Calanus finmarchicus exposed to mechanically and chemically dispersed crude oil

    The rate of ingestion of oil micro droplets and oil fouling were investigated in the zooplankton filter‐feeder Calanus finmarchicus (Gunnerus, 1770) at three concentrations of oil dispersions ranging from 0.25 to 5.6 mg x L−1. In order to compare responses to mechanically and chemically dispersed oil, the copepods were exposed to comparable dispersions of micron‐sized oil droplets made with ...


    By John Wiley & Sons, Ltd.

  • Comparative effects of biological and chemical dispersants on the bioavailability and toxicity of crude oil to early life stages of marine medaka (Oryzias melastigma)

    We assessed the bioavailability and chronic toxicity of water‐accommodated fractions of crude oil (WAFs) and two dispersants plus dispersed crude oil (chemical dispersant + crude oil, CE‐WAF, and biological dispersant + crude oil, BE‐WAF) on the early life stages of marine medaka, Oryzias melastigma. Results showed that the addition of the two dispersants caused a three‐ and four‐fold increase ...


    By John Wiley & Sons, Ltd.

  • Effects of chemical dispersant and seasonal conditions on the fate of spilled oil – modelling of a hypothetical spill near Saint John, NB

    The proposed Energy East pipeline project has raised concerns about potential oil spills in Saint John, New Brunswick. While environmental conditions could pose challenges for using mechanical recovery methods if a spill occurs, chemical dispersant could be an alternative. However, the application of chemical dispersant in shallow water and costal zones remains an issue of debate. Furthermore, ...


    By IWA Publishing

  • An operational dispersion model for predicting pollution from a road

    We present here a mathematical model for predicting dispersion of pollution from a road, for use in a regulatory context. The model includes an emission model, treatment of the meteorological time series, a dispersion model, statistical analysis of the computed time series of concentrations and a graphical Windows-based user interface. The dispersion model is based on a partly analytic solution ...


    By Inderscience Publishers

  • Stable dispersions of single-walled carbon nanotubes

    The degree of dispersion of Single-Walled Carbon Nanotubes (SWCNTs) in different solvents is an issue in all studies where applications (in microelectronics, as well as in biological in vitro and in vivo systems) are envisaged. We performed long-term dispersion studies of SWCNTs in four different solvents: phosphate buffer solution (PBS), poly(sodium 4-styrene-sulfonate) (NaPSS), Gum Arabic (GA), ...


    By Inderscience Publishers

  • Applying Proper Dispersion Models for Industrial Accidental Releases

    Even though many industrial facilities have put extra efforts to prevent accidental releases of active and inactive chemicals from processes or storage, accidental releases do happen from time to time due to many reasons. Federal and state regulations require industrial facilities to evaluate and report the impacts of potential accidental releases in terms of distances to toxic endpoint ...


    By Trinity Consultants

Need help finding the right suppliers? Try XPRT Sourcing. Let the XPRTs do the work for you