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Experimental and numerical investigation to elucidate the fluid flow through packed beds with structured particle packings

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Particuology 2024年第6期89卷 218-237页

作者： Shirin Patil Christian Gorges joel l.pez bonilla Moritz Stelter Frank Beyrau Berend van Wachem laboratory of Technical Thermodynamics Otto-von-Guericke-Universität MagdeburgUniversitätsplatz 239106 MagdeburgGermany Chair of Mechanical Process Engineering Otto-von-Guericke-Universität MagdeburgUniversitätsplatz 239106 MagdeburgGermany

The present paper presents an experimental and numerical investigation of the dispersion of the gaseous jet flow and co-flow for the simple unit cell(SUC)and body-centred cubic(BCC)configuration of particles in packed *** experimental setup is built in such a way that suitable and simplified boundary conditions are imposed for the corresponding numerical framework,so the simulations can be done under very similar conditions as the ***,a porous plate is used for the co-flow to achieve the uniform velocity and the fully developed flow is ensured for the jet *** SUC and BCC particle beds consist of 3D-printed spheres,and the non-isotropy near the walls is mostly eliminated by placing half-spheres at the channel *** flow velocities are analysed directly at the exit of the particle bed for both beds over 36 pores for the SUC configuration and 60 pores for the BCC configuration,for particle Reynolds numbers of 200,300,and *** particle image velocimetry is experimentally arranged in such a way that the velocities over the entire region at the exit of the packed bed are obtained *** numerical method consists of a state-of-the-art immersed boundary method with adaptive mesh *** paper presents the pore jet structure and velocity field exiting from each pore for the SUC and BCC packed particle *** numerical and experimental studies show a good agreement for the SUC configuration for all flow *** the BCC configuration,some differences can be observed in the pore jet flow structure between the simulations and the experiments,but the general flow velocity distribution shows a good overall *** axial velocity is generally higher for the pores located near the centre of the packed bed than for the pores near the *** addition,the axial velocities are observed to increase near the peripheral pores of the packed *** behaviour is predominant for the BCC configuration as compared to t

关键词： Uniform particle packing Packed bed reactor Stereo particle image velocimetry Immersed boundary method

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Removing contaminants from tannery wastewater by chemical precipitation using CaO and Ca(OH)2

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Chinese Journal of Chemical Engineering 2020年第4期28卷 1107-1111页

作者： Adriana Reyes-Serrano joel El.pez-Alejo Manuel AHernández-Cortázar Ignacio Elizalde Instituto Politécnico Nacional Centro Mexicano para la Producción más LimpiaCiudad de México 07340Mexico

The removal of Cr,sulfates and Chemical Oxygen Demand(COD)from industrial tannery wastewater by chemical precipitation was carried out using Calcium oxide(CaO)and Calcium hydroxide(Ca(OH)2).Different doses of alkalis,ranging from deficiency to excess hydroxyl species over the stoichiometric necessary,were used to remove theoretically the 100%of Cr[0.3-3.2 g alkali·(g Cr^3+)^-1].The precipitation was carried out at room temperature,10 min of vigorous stirring,200 r·min^-1 and a settling time of 24 h,followed by separation and characterization of liquid *** result of addition of alkalis,pH underwent increase as did the alkali *** removal of Cr,and sulfates also increased as alkali concentration did,although for first species the changes at higher alkali contents were less *** removal on the other hand,did not follow a unique trend,instead exhibited a *** on our results,selection of a specific dose of alkali was carried out taking as reference the efficiency on total chromium removal,keeping the pH in the range 7 to 9 to ensure Cr precipitation as chromium *** those conditions,jar test was used to produce enough liquid product in order to determine the removal percent of several other *** removal percent of the species was as follows:Cr,SO4^2-,ZnSO4,FeSO4,CN^-1,NiSO4,Fe2[Fe(CN)6]at 99.8%,66.9%,99.6%,21.4%,70.9%,52.8%and 76.4%with CaO,and 99.8%,61.6%,99.9%,7.1%,84.0%,54.4%and 90.5%with Ca(OH)2,respectively.

关键词： Tannery wastewater Alkali Removal Chromium Sulfates Synergistic effect

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DNA Fidelity: Expression of a Monocot Promoter in a Dicot Plant

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American Journal of Plant Sciences 2022年第1期13卷 50-59页

作者： luis María Suárez-Rodríguez Hugh Mason joel Ramírez-Cabrera luis Jorge Saucedo Miguel Angel Gómez-lim Charles Arntzen Rodolfo l.pez-Gómez Instituto de Investigaciones Químico-Biológicas Universidad Michoacana de San Nicolás de Hidalgo Morelia México School of life Sciences Arizona State University Tempe USA Departamento de Genética Cinvestav IPN Campus Irapuato Irapuato México

The knowledge generated from the identification of plant promoters has been very important for plant biotechnology development. The use of promoters in transgenic plants allows a reasonable level of regulating protein expression. With the application of reporter genes, such as gusA (uidA,) the production of a colored protein, β-glucuronidase, can be detected and measured both qualitatively and quantitatively, and the activity of the promoter can be assessed. In this work we use a promoter of an abundant banana fruit protein gene Musa acuminata Acidic Chitinase class III a monocot species, to drive expression of gusA in a dicot species, like tomato. We evaluated the monocot promoter capabilities by localizing and quantifying β-glucuronidase (GUS) expression through fluorometric assays during tomato fruit ripening. Our results suggest that this promoter could be used for specifically strong fruit protein expression in dicot plants.

关键词： Promoter Fruit Ripening Tomato Banana

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A Novel Classification of Brain Invasion in Malignant Ethmoidal Tumors and Management Proposal

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International Journal of Otolaryngology and Head & Neck Surgery 2019年第5期8卷 151-165页

作者： joel Caballero-García Nélido Gonzáles-Fernández Pedro Pablo Morales-Hechevarría Carlos Aparicio-García Misael l.pez Sánchez Juvenal Huanca-Amaru National Institute of Oncology and Radiobiology La HabanaCuba

Object: Brain invasion is unusual in patients with paranasal sinuses cancer. Staging systems do not specify brain invasion extension who has an impact in therapeutic strategy and prognosis. Surgical series of this patient treated by endonasal endoscopic approach are scarce. In this paper, a novel classification and surgical strategy is proposed. Methods: A retrospective review of patients with ethmoidal malignant tumors with brain invasion treated at the National Institute of Oncology and Radiobiology from January 2015 to October 2017 by means endonasal endoscopic surgery was performed. All medical records were reviewed for demographics, diagnoses, presentation, endoscopic approach, reconstructive techniques and clinical outcomes. Pattern of brain invasion was classified in five grades. Chi-squared test, ANOVA test and Kaplan-Meier curves were used. Results: Forty-seven patients (26 males and 21 females) were registered. Mean age was 52.3 years ± 27.0. Only 3 patients presented with neurologic symptoms. Histologic subtypes were squamous cell carcinoma (25 patients), adenocarcinoma (16 patients), and esthesioneuroblastoma (6 patients). Five patients corresponded to Grade I, 39 Grade II and 3 Grade III. The mean surgical time was 351.9 min (±45). The mean blood loss was 704.5 ml (±206). The mean ICU stay was 1.1 (ranging from 1 to 2 ) days and the hospital stay was 5.3 (ranging from 5 to 7) days. Conclusions: Brain invasion represents a particular therapeutic challenge in patients with malignant nasosinusal tumors. Surgical treatment is possible in some cases, including endonasal endoscopic approach. A stage classification of brain invasion helps to establish an optimal surgical strategy and a prognosis.

关键词： Sinunasal Cancer Brain Invasion Endoscopic Surgery

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Microbiological Identification of Atmospheric Particles in Hermosillo, Sonora, México

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Journal of Environmental Protection 2014年第5期5卷 376-386页

作者： Santos-Romo Alvaro Sau-Acosta Nancy Janeth Certucha-Barragán María Teresa Almendáriz-Tapia Francisco Javier Monge-Amaya Onofre Hernández-l.pez Jorge Zepeda-Ibarra joel Department of Chemical Engineering & Metallurgy within the Engineering Division of the University of Sonora Hermosillo Mexico Nortwest BiologicalInvestigation Centre Hermosillo Mexico Urban Development and Ecology General Coordination of Infrastructure Municipal Institute of Ecology Hermosillo Mexico

The air quality in many cities has been deteriorating and affecting population’s health. Airborne particles can block the defense mechanisms of respiratory system and may lead biological elements such as pollen, bacteria, fungi and viruses into the lungs. This paper presents the study of biologically contaminated air in the city of Hermosillo, analyzing filters containing particulate matter with a diameter equal or less than 10 micrometers (PM10) and Total Suspended Particles (TSP). Three sampling periods were analyzed during 2011. Samples taken from the filters were placed in tubes containing nutritive broth BHI (Brain Heart Infusion) and incubated at 37 °C for 24 hours. The identification of the isolated microorganisms was done by a biochemical test recommended in Bergey’s Manual. Results showed a high bacteria concentration in the presence of microorganisms such as Klebsiella pneumoniae sub pneumoniae, Citrobacter, Enterococcus faecalis, Proteus penneri, Butiauxellaagrestis, Salmonella paratyphi A and Enterobacter sacazakii. When bacterial concentration was analyzed separately, the lowest number of bacteria was observed during February for the south location and in August for the north location. The highest degree of bacterial air pollution was found in the central area of the city.

关键词： Air Pollution Airborne Particles Bacteria

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