bluuebunny/crossref_metadata_2025_split huggingface dataset:
Properties of Fuel Spray Obtained by Electrohydrodynamic Atomization
Authors: Daaboul Michel , Saba Nicolas , Rishmany Jihad , Louste Christophe 
Published: September 2017

Airblast atomization is com monly used to atomize fuel in aircraft engines. An annular liquid sheet is atomized bythe shear forces exerted by the co-flowing air stream. Nevertheless, this technique is less effe ctive in some specific cases, e.g. when the external air flow velocity is relatively low. Electrohydrodynamic (EHD) atomization can constitute a solution in these cases. It consists of applying an electric field between two electrodes and electricallycharging the passing carburant. This phenomenon will create instabilities within the liquid, provoking therefore its atomization. The main objective is therefore to electrically atomize a liquid sheet without the application of an external air flow like in airblast atomizers.This paper presents a novel actuator, based on dielectric barrier injection, used to induce instabilities within a plane liquid sheet of fuel similar to the annular sheet in aircraft engines. The behaviour of this atomizer was described in previous works. Several modes were observed, sometimes leading to a complete atomization, or just inducing instabilities and oscillating the liquid sheet. In the present study, only the cases where the liquid sheet is completely atomized are investigated. Images were reco rded with the help of a high speed camera. Primary atomization is only studied, secondaryatomization being neglected. The properties of the spray obtained by EHD atomization are investigated thoroughly, namely the breakup length, the mesh size, the drople t diameter, thedroplet count, etc.DOI: http://dx.doi.org/10.4995/ILASS2017.2017.5018
Numerical Investigation of Droplet Impact on Smooth Surfaces with Different Wettability Characteristics: Implementation of a dynamic contact angle treatment in OpenFOAM.
Authors: Georgoulas Anastasios , Vontas Konstantinos , Andredaki Manolia , Nikas Konstantinos Stefanos , Marengo Marco 
Published: September 2017

The “Direct Numerical Simulations” (DNS) of droplet impact processes is of great interest and importance for a variety of industrial applications, where laboratory experiments might be difficult, costly and time-consuming. Furthermore, in most cases after validated against experimental data, they can be utilised to further explain the experimental measurements or to extend the experimental runs by performing “virtual” numerical experiments. In such “DNS” calculations of the dynamic topology of the interface between the liquid and gas phase, the selected dynamic contact angle treatment is a key parameter for the accurate prediction of the droplet dynamics. In the present paper, droplet impact phenomena on smooth, dry surfaces are simulated using three different contact angle treatments. For this purpose, an enhanced VOF-based model, that accounts for spurious currents reduction, which has been previously implemented in OpenFOAM CFD Toolbox, is utilised and further enhanced. Apart from the already implemented constant and dynamic contact angle treatments in OpenFOAM, the dynamic contact angle model of Kistler, that considers the maximum advancing and minimum receding contact angles, is implemented in the code. The enhanced VOF model predictions are initially compared with literature available experimental data of droplets impacting on smooth surfaces with various wettability characteristics. The constant contact angle treatment of OpenFOAM as well as the Kistler’s implementation show good qualitative and quantitative agreement with experimental results up to the point of maximum spreading, when the spreading is inertia dominated. However, only Kistler’s model succeeds to accurately predict both the advancing and the recoiling phase of the droplet impact, for a variety of surface wettability characteristics. The dynamic contact angle treatment fails to predict almost all stages of the droplet impact. The optimum version of the model is then applied for 2 additional series of parametric numerical simulations that identify and quantify the effects of surface tensionand viscosity, in the droplet impact dynamics.DOI: http://dx.doi.org/10.4995/ILASS2017.2017.5020
LIF/Mie Droplet Sizing of Water Sprays from SCR System Injector using Structured Illumination
Authors: Kapusta Łukasz Jan 
Published: September 2017

Recent trends in SCR (Selective Catalytic Reduction) systems development increase requirements for UWS (UreaWater Solution) injection. Close-coupled SCR system designs decrease the distance available for water evaporation and urea decomposition. Due to that, much effort is put into static mixing elements design improvement and injection process enhancement. So far, most experimental studies on UWS spray formation were based on Mie scattering visualization using global illumination and shadowgraphy imaging. High speed imaging of Mie signal with global illumination allows to determine global spray parameters such as penetration and angle but does not give information on droplet sizes. Droplet size determination, due to relatively large droplets generated by SCR injectors, can be done with Mie scattering or backlight imaging methods. Then the visualized area becomes narrowed since high magnification is required. Determination of droplet size distribution across whole spray in such arrangement requires number of measurements. LIF/Mie (Laser Induced Fluorescence/Mie scattering) technique provides an attractive alternative for rapid determination of droplet size distribution across the whole spray. This method however suffers from multiple scattering effects which might affect droplet size distribution results even in relatively dilute sprays.In this study, LIF/Mie ratio distribution across sprays from commercial automotive injector for SCR systems was determined by simultaneous LIF and Mie detection using structured illumination. Moreover, the results were compared with conventional LIF/Mie imaging. Nd:YAG pulse laser was used as a light source. Second harmonic beam of 532 nm was used to illuminate the sprays. Instead of UWS pure water doped with Eosin Y was used. The results showed that conventional images exhibited much stronger background signal. Moreover, the conventional imaging was sensitive to reflections from experimental setup elements, specifically reflections from LIF camera filter. These two observations prove the importance of using SLIPI for LIF/Mie droplets sizing in sprays for SCR systems. At the same time the obtained results showed that under certain conditions (no accidental reflections in the background) conventional imaging provides similar LIF/Mie ratio as structured illumination. The results showed that the LIF/Mie ratio remains unchanged over the spray cloud. This suggests that SMD remains unchanged as well. The slight increase of LIF/Mie ratio far from the injector outlet could be caused by absence of small droplets due to lower momentum and thus lower penetration distance. This assumption however should be verified with PIVmeasurement.DOI: http://dx.doi.org/10.4995/ILASS2017.2017.5031
Liquid-Liquid Secondary Fragmentation with Solidification
Authors: Rimbert Nicolas , Hadj-Achour M. , Gradeck M. 
Published: September 2017

In the event of a hypothetical core disruptive accident in nuclear power plants, the molten core may flow out thereactor vessel and interact with the cold water. The evolution of the accident is strongly affected by the fragmentation of the jet of molten metallic fuel due to its interaction with the water (i.e. this situation is known as fuel coolant interaction, FCI). In order to evaluate and predict the various consequences of a FCI, many researches are conducted with either corium or high melting temperature molten metal, where premixing stage evolves with an important production of steam. This steam production that is unavoidable because the high temperature of corium leads to difficulties for using optical diagnostics. Hence, in our case, we use a eutectic alloy (Field’s metal) with a low melting point (62°C) in order to be able to visualize correctly the droplet fragmentation processes.The present work focuses on the fragmentation of a single Field’s metal liquid droplet with mass equals to 0.27g (±0.01g). The liquid droplet interacts with a water pool whose temperature range between 20°C to 60°C. According to its Weber number, it fragments in different ways. For each experiment, a single droplet has been visualized using a high-speed camera (at 8000 fps). All measurements (drop size, velocity, impact parameter and geometrical properties of the drops after the penetration) into the pool are evaluated using an open source image processing. Solidified fragments can then be sieved and the size PDF determined. Focus of the present work is put on the evolution of the Sauter Mean Diameter with increasing Weber number and varying bath pool temperature. It is shown that using a simple crust model during solidification and defining an effective Weber number which include the crust elasticity all the curves collapse on the same master curve for all the water bathtemperature considered.DOI: http://dx.doi.org/10.4995/ILASS2017.2017.5034
Characteristics of Control Piston Motion and Pressure Inside of a Common Rail Diesel Injector
Authors: Schuckert Sebastian , Wachtmeister Georg 
Published: September 2017

In this paper the experimental setup of a commercial third generation common rail solenoid injector with advancedmeasurement is discussed. The motion of the control piston is measured while performing injection rate investigations using a purpose-built injection rate analyzer of the Bosch type. At the same time fuel pressure in the feed line of the nozzle is gauged and contrasted to fuel pressure before the inlet connector.In contrast to the steady rise observed in a similar study, the motion of the control piston in this case is characterized by a changing gradient in the upward movement. The magnitude of the negative displacement of the upper part of the control piston due to the fuel pressure in the control volume corresponds to simulation results of the elastic deformation.Pressure before the inlet connector and pressure in the feed line exhibit a similar course with a difference in magnitude that is rising with higher rail pressures. Precisely with the end of injection the pressure in the feed line surpasses the pressure before the inlet connector for a short moment. The measurement results of control piston motion and pressure inside the injector are of particular interest because these parameters are to serve as indicatorsfor changes in the injection rate caused by phenomena like wear and coking amongst others.DOI: http://dx.doi.org/10.4995/ILASS2017.2017.6454
Regional contributions to particulate matter concentration in the Seoul metropolitan area, South Korea: seasonal variation and sensitivity to meteorology and emissions inventory
Authors: Kim Hyun Cheol , Kim Eunhye , Bae Changhan , Cho Jeong Hoon , Kim Byeong-Uk , Kim Soontae 
Published: September 2017

Abstract. The impact of regional emissions (e.g., domestic and international) on surface particulate matter (PM) concentrations in the Seoul metropolitan area (SMA), South Korea, and its sensitivities to meteorology and emissions inventories are quantitatively estimated for 2014 using regional air quality modeling systems. Located on the downwind side of strong sources of anthropogenic emissions, South Korea bears the full impact of the regional transport of pollutants and their precursors. However, the impact of foreign emissions sources has not yet been fully documented. We utilized two regional air quality simulation systems: (1) a Weather Research and Forecasting and Community Multi-Scale Air Quality (CMAQ) system and (2) a United Kingdom Met Office Unified Model and CMAQ system. The following combinations of emissions inventories are used: the Intercontinental Chemical Transport Experiment-Phase B, the Inter-comparison Study for Asia 2010, and the National Institute of Environment Research Clean Air Policy Support System. Partial contributions of domestic and foreign emissions are estimated using a brute force approach, adjusting South Korean emissions to 50 %. Results show that foreign emissions contributed  ∼  60 % of SMA surface PM concentration in 2014. Estimated contributions display clear seasonal variation, with foreign emissions having a higher impact during the cold season (fall to spring), reaching  ∼  70 % in March, and making lower contributions in the summer,  ∼  45 % in September. We also found that simulated surface PM concentration is sensitive to meteorology, but estimated contributions are mostly consistent. Regional contributions are also found to be sensitive to the choice of emissions inventories.
La suspensión del derecho a sufragio de las personas privadas de libertad como un acto de discriminación
Authors: Müller Guzmán Karl , Vicencio Rojas Evelyn 
Published: September 2017

En este trabajo se desarrollan tanto las razones que justifican como aquellas que rechazan la pérdida del derecho de sufragio a quien se encuentre privado de libertad. Asimismo, se explica la antinomia que existe entre el artículo 16 número 2 de la Constitución que consagra la suspensión del derecho de sufragio a la persona acusada por delito que merezca pena aflictiva o por delito
que la ley califique como conducta terrorista,y lo dispuesto en el artículo 23 número 2 de la Convención Americana de Derechos Humanos que permite limitar tal derecho respecto de personas condenadas por juez competente
en proceso penal. Esta situación, a su vez, puede generar responsabilidad internacional del Estado.
Revisión de la jurisprudencia administrativa de la Superintendencia de Valores y Seguros en relación a la oferta pública y privada de valores en Chile
Authors: Valderrama Venegas Mario 
Published: September 2017

Este artículo presenta un panorama de la interpretación administrativa de la Superintendencia de Valores y Seguros en relación al concepto de oferta pública/privada de valores, conforme a la Ley 18.045 de Mercado de Valores. Además, realiza algunos breves comentarios al régimen de excepción de inscripción en el registro de valores. La
presente contribución tiene por objeto dar mayor claridad respecto a conceptos básicos para la aplicación de la Ley 18.045 en Chile.
« Du reste il nous apprend peu de choses intéressantes » : des (in)fortunes littéraires de Gabriel Sagard
Authors: Côté Sébastien 
Published: September 2017

Témoin privilégié des débuts de la vie coloniale en Nouvelle-France, Gabriel Sagard est surtout connu pourLe Grand Voyage du pays des Hurons(1632), récit de son long séjour chez les Hurons de l’actuelle baie Georgienne. Or, malgré leurs qualités indéniables, ses ouvrages furent jugés trop naïfs par l’historien jésuite Charlevoix, dont les observations nuisirent, du moins pour un temps, à leur fortune littéraire. Après une présentation de quelques usages des oeuvres de Sagard jusqu’à la fin du XVIIIe siècle, cet article étudie leur réception ambivalente dans une sélection d’histoires littéraires du Canada français et du Québec depuis le XIXe siècle.
TEORIA DO CONHECIMENTO, EPISTEMOLOGIA E MATERIALISMO HISTÓRICO DIALÉTICO NA PESQUISA E NO TRABALHO PEDAGÓGICO EM EDUCAÇÃO FÍSICA
Authors: Neto Gabriel Pereira Paes , França Ney Ferreira , Furtado Renan Santos 
Published: September 2017

<p>Trata-se de pesquisa bibliográfica na qual analisamos a perspectiva de reaproximação da teoria do conhecimento, a epistemologia a partir do materialismo histórico dialético para fundamentar a pesquisa e o trabalho pedagógico em educação física. Analisamos que as pesquisas devem pressupor a práxis e a dialética como categoria central e à luz desta que se devem abordar os problemas do conhecimento, da história e da própria realidade, portanto a defesa do MHD enquanto epistemologia e o socialismo enquanto projeto histórico. A educação física deve-se reverter o circuito de conhecimento superando os modelos hegemônicos, pressupondo também a pedagogia histórico-crítica e o paradigma da cultura corporal. </p>
A CRÍTICA CRÍTICA DOS GIROS EPISTEMOLÓGICOS E/OU LINGUÍSTICOS NO DEBATE POLÍTICO-EPISTEMOLÓGICO DA ÁREA DA EDUCAÇÃO FÍSICA
Authors: Sacardo Michele , Silva Régis Henrique Dos Reis 
Published: September 2017

<p class="western" align="justify"><a name="__DdeLink__704_758246587"></a><span style="font-family: Garamond, serif;">O objetivo deste artigo é discutir sucintamente a crítica crítica dos giros epistemológicos e/ou linguístic</span><span><span style="font-family: Garamond, serif;">os</span></span><span style="font-family: Garamond, serif;"> no debate político-epistemológico da área da Educação Física brasileira. Para tanto, retomamos brevemente o processo de gênese e desenvolvimento do debate político-epistemológico da Educação Física brasileira. Posteriormente, discutimos os limites e inconsistências do discurso “pluralista” de um grupo de epistemólogos na referida área, e a defesa das concepções de verdade e realidade como categorias histórico-ontológicos. C</span><span><span style="font-family: Garamond, serif;">oncluímos que a perspectiva dos defensores dos giros epistemológicos e/ou linguísticos não consegue</span></span><span style="font-family: Garamond, serif;">avançar para além das práticas descritivas da verdade, entendida a partir de consensos intersubjetivos e da implementação de uma postura conservadora.</span></p><p align="justify"><span style="font-family: Garamond, serif;"><span><strong> Palavras-chave:</strong></span></span><span style="font-family: Garamond, serif;"><span> </span></span></p>
EPISTEMOLOGIA PÓS-MODERNA E SUA LEITURA DE VIGOTSKI
Authors: Costa Eduardo Moura , Tuleski Silvana Calvo 
Published: September 2017

<p class="Resumo-Texto"><span>O presente artigo tem como objetivo analisar historicamente as formas que o construcionismo social interpretou os conceitos vigotskianos, sobretudo do ponto de vista epistemológico. Constatou-se que Vigotski foi utilizado pelo construcionismo social para fundamentar a ideia de que nos formamos nas relações sociais, mediados pela linguagem. Contudo apresenta uma concepção idealizada de linguagem, principalmente pela desconsideração das bases marxistas do psicólogo soviético. A chave desse problema seria compreender a linguagem e o conhecimento como independetes da reprodução material da sociedade. Conclui-se que a concepção construcionsita está em desacordo com as ideias de Vigotski, sobretudo a partir do seu sistema conceitual geral. </span></p>
Thaw Depth Determines Dissolved Organic Carbon Concentration and Biodegradability on the Northern Qinghai‐Tibetan Plateau
Authors: Mu C. C. , Abbott B. W. , Wu X. D. , Zhao Q. , Wang H. J. , Su H. , Wang S. F. , Gao T. G. , Guo H. , Peng X. Q. , Zhang T. J. 
Published: September 2017

AbstractThe response of dissolved organic carbon (DOC) flux to permafrost degradation is one of the major sources of uncertainty in predicting the permafrost carbon feedback. We investigated DOC export and properties over two complete flow seasons in a catchment on the northern Qinghai‐Tibetan Plateau. DOC concentration and biodegradability decreased systematically as thaw depth increased through the season, attributable to changing carbon sources and degree of microbial processing. Increasing DOC aromaticity and δ13C‐DOC indicated shifts toward more recalcitrant carbon sources and greater residence time in soils prior to reaching the stream network. These strong and consistent seasonal trends suggest that gradual active layer deepening may decrease DOC export and biodegradability from permafrost catchments. Because these patterns are opposite observations from areas experiencing abrupt permafrost collapse (thermokarst), the overall impact of permafrost degradation on DOC flux and biodegradability may depend on the proportion of the landscape experiencing gradual thaw versus thermokarst.
A Decade of Induced Slip on the Causative Fault of the 2015Mw4.0 Venus Earthquake, Northeast Johnson County, Texas
Authors: Scales Monique M. , DeShon Heather R. , Magnani M. Beatrice , Walter Jacob I. , Quinones Louis , Pratt Thomas L. , Hornbach Matthew J. 
Published: September 2017

AbstractOn 7 May 2015, aMw4.0 earthquake occurred near Venus, northeast Johnson County, Texas, in an area of the Bend Arch‐Fort Worth Basin that reports long‐term, high‐volume wastewater disposal and that has hosted felt earthquakes since 2009. In the weeks following theMw4.0 earthquake, we deployed a local seismic network and purchased nearby active‐source seismic reflection data to capture additional events, characterize the causative fault, and explore potential links between ongoing industry activity and seismicity. Hypocenter relocations of the resulting local earthquake catalog span ~4–6 km depth and indicate a fault striking ~230°, dipping to the west, consistent with a nodal plane of theMw4.0 regional moment tensor. Fault plane solutions indicate normal faulting, withBaxes striking parallel to maximum horizontal compressive stress. Seismic reflection data image the reactivated basement fault penetrating the Ordovician disposal layer and Mississippian production layer, but not displacing post‐Lower Pennsylvanian units. Template matching at regional seismic stations indicates that low‐magnitude earthquakes with similar waveforms began in April 2008, with increasing magnitude over time. Pressure data from five saltwater disposal wells within 5 km of the active fault indicate a disposal formation that is 0.9–4.8 MPa above hydrostatic. We suggest that the injection of 28,000,000 m3of wastewater between 2006 and 2015 at these wells led to an increase in subsurface pore fluid pressure that contributed to inducing this long‐lived earthquake sequence. The 2015Mw4.0 event represents the largest event in the continuing evolution of slip on the causative fault.
Water Ice Radiolytic O2, H2, and H2O2 Yields for Any Projectile Species, Energy, or Temperature: A Model for Icy Astrophysical Bodies
Authors: Teolis B. D. , Plainaki C. , Cassidy T. A. , Raut U. 
Published: September 2017

AbstractO2, H2, and H2O2 radiolysis from water ice is pervasive on icy astrophysical bodies, but the lack of a self‐consistent, quantitative model of the yields of these water products versus irradiation projectile species and energy has been an obstacle to estimating the radiolytic oxidant sources to the surfaces and exospheres of these objects. A major challenge is the wide variation of O2 radiolysis yields between laboratory experiments, ranging over 4 orders of magnitude from 5 × 10−7 to 5 × 10−3 molecules/eV for different particles and energies. We revisit decades of laboratory data to solve this long‐standing puzzle, finding an inverse projectile range dependence in the O2 yields, due to preferential O2 formation from an ~30 Å thick oxygenated surface layer. Highly penetrating projectile ions and electrons with ranges ≳30 Å are therefore less efficient at producing O2 than slow/heavy ions and low‐energy electrons (≲ 400 eV) which deposit most energy near the surface. Unlike O2, the H2O2 yields from penetrating projectiles fall within a comparatively narrow range of (0.1–6) × 10−3 molecules/eV and do not depend on range, suggesting that H2O2 forms deep in the ice uniformly along the projectile track, e.g., by reactions of OH radicals. We develop an analytical model for O2, H2, and H2O2 yields from pure water ice for electrons and singly charged ions of any mass and energy and apply the model to estimate possible O2 source rates on several icy satellites. The yields are upper limits for icy bodies on which surface impurities may be present.