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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 lòpez 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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Clinical Behavior of Dengue and Chikungunya Infections in the Instituto Mexicano del Seguro Social

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Open Journal of Medical Microbiology 2016年第1期6卷 23-31页

作者： joel Navarrete-Espinosa Joaquín Gonzalez-Ibarra Clara E. Santa Cruz-Tinoco Cesar R. Gonzalez-bonilla Miguel Pacheco-Hernández José E. Muñoz-Medina División de Enfermedades Transmisibles Coordinación de Vigilancia Epidemiológica IMSS México City México División de laboratorios de Vigilancia e Investigación Epidemiológica Coordinación de Vigilancia Epidemiológica IMSS México City México

Arbovirus infections have increased worldwide in the last years and specific differential diagnosis may be difficult owing to their similar clinical presentations. Here we describe and compare the clinical manifestations of dengue and chikungunya fever. Material and Methods: In order to portray the clinical behavior of both diseases, a cross-sectional study was performed including patients insured by the Mexican Institute for Social Security (IMSS), their demographic data, and clinical signs and symptoms. laboratory parameters were analyzed. Results: One thousand four hundred and ninety-five dengue and 1810 chikungunya cases were studied. All patients presented fever, whereas headache, myalgias, mild arthralgias, and ocular pain were more frequent in dengue cases. Severe incapacitating polyarthralgias, arthritis, and conjunctivitis were present only in chikungunya cases. Also, edema and exanthema were more frequent in patients with chikungunya. liquid leak to tissues and hemorrhage were more frequent among dengue cases. Platelet counts were lower in hemorrhagic dengue (P laboratory parameters were altered between the second and third day of evolution and tended to return to normal from the fifth day. Discussion: The clinical features observed in this group of patients may contribute to the differential diagnosis of both diseases. The cardinal signs of severity were not present in all cases of any of the two diseases. It is important to consider these issues in order to establish an early diagnosis and improve the prognosis of patients.

关键词： Chikungunya Behavior Clinical

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