Examinando por Materia "Anisotropy"

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    Análisis de los efectos de la anisotropía en los parámetros de resistencia del suelo y la permeabilidad para el diseño de taludes
    (Universidad EIA, 2019, 2019) Arias Patiño, Juliana; García Aristizábal, Edwin Fabián
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    Anisotropía en suelos residuales caso: suelos residuales provenientes del campus de la EIA en la Sede Las Palmas
    (Universidad EIA, 2013) Valdés Giraldo, Juan Camilo; Builes Brand, Builes Brand
    El foco de este trabajo es estimar la anisotropía de los suelos residuales, más específicamente provenientes de roca parental anfibolita la cual es dominante en el oriente antioqueño con el fin de al momento de diseñar geotécnicamente tener un análisis más cercano a la realidad. La toma de muestras en tubos shelby se realizó en el campus de la Escuela de Ingeniería de Antioquia. Se extrajeron muestras inalteradas a 3 metros de profundidad con el fin de llegar a suelo residual, pasando la capa de cenizas existente en el oriente antioqueño.
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    PublicaciónAcceso abierto
    Estudio del efecto de la anisotropía en los parámetros de resistencia de suelos residuales del Valle de San Nicolás y su efecto en el análisis de estabilidad de taludes
    (Universidad EIA, 2017) Gómez Vega, Natalia; Peláez Restrepo, Ana Isabel; García Aristizábal, Edwin Fabián
    El presente trabajo de grado presenta los resultados de los ensayos de laboratorio realizados en un suelo residual localizado en oriente antioqueño, más específicamente en suelos de la Universidad EIA. Los ensayos comprenden la caracterización física del material y la determinación de los parámetros de resistencia por medio del ensayo de corte directo para condiciones consolidadas drenadas y consolidadas no drenadas. Adicionalmente, con el propósito de estudiar la respuesta anisotrópica del material, se hicieron tomas de muestras a 0 º, 30º, 60º y 90º, para evaluar la variación de los parámetros de resistencia. Los resultados mostraron un leve comportamiento anisotrópico y distintivo dependiente de las condiciones drenadas o no drenadas. Finalmente, se calcularon los factores de seguridad para cuatro superficies de falla, considerando la anisotropía del material por medio del programa SLIDE. Los resultados de la modelación mostraron la importancia de considerar la anisotropía de los suelos en el análisis de la estabilidad de los taludes.
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    ÍtemSólo datos
    Modelling the fast pyrolysis of anisotropic biomass particles with aerosol production
    (Universidad EIA, 2023) Sánchez Posada, Mario Alejandro; Maya López, Juan Carlos; Quinchía Figueroa, Adriana María
    ABSTRACT: agricultural production generates significant amounts of residues that are not valued and contributes to environmental pollution; In Colombia alone, 78 million tons of agricultural residues are generated each year. Moreover, only a small fraction of the produced biomass in the agricultural sector correspond to useful products: the “fique” industry uses only the 2% of the produced biomass, the beer industry uses only 8% of the grain nutrients, while palm oil industry uses less than 9% of the produced biomass, in coffee industry only 9,5% of the fruit weight is utilized, while in the paper industry just the 30% of the raw biomass is made of (Cury et al., 2017). The valorization of these residues not only to reduces environmental pollution but also contributes to increase sector productivity through the production of high value products. One of the alternatives for biomass residues characterization is the production of bio-oil through fast pyrolysis with its subsequent upgrade to obtain high value products such as fuels, or chemicals as furfural, acetol (hydroxy acetone), levoglucosan, acetic acid, 5-HMF, hydroxyl-acetaldehyde, products that are used are raw materials in the food, textile, paints, pharmaceutical and cosmetic sectors. The bio-oil from biomass fast pyrolysis is a mixture of compounds coming from the decomposition of the cellulose, hemicellulose and lignin. Particularly, in the bio-oil can be found heavy components such as lignin oligomers, anhydrosugars, and some minerals. The concentration of these heavy components in bio-oil affects subsequent processes as the hydrotreatment to obtain fuels (Iisa et al., 2019). A fraction of the aforementioned heavy components in bio-oil comes from aerosols that are ejected from the biomass particle during fast pyrolysis (primary aerosols), however, the contribution of the aerosols to this heavy fraction is still uncertain, since these aerosols suffer secondary extra-particle reactions within the reactor and there is also formation of secondary aerosols during the condensation process of volatiles products (Montoya et al., 2016). Even though there are multiples studies on the effect of some process parameters and particles characteristics (heating rate, holding temperature, pressure, particle size) on the heavy fraction yield, the effect of these parameters on aerosol production has been little studied. Currently, there is no fast pyrolysis model that considers realistic characteristics of the particle such as shape and anisotropy and provides information about the production of aerosols and its size distribution (Brennan Pecha et al., 2019). The information about the produced aerosols is important for the later analysis of the extra-particle reactions within the reactor and to clarify the participation of primary aerosols on the heavy fraction yield. Based on the problem description presented above the research question for the present work is the following: ¿Is the effect of particle shape and anisotropy on the production primary aerosols significant during biomass fast pyrolysis? This project aims at advancing the current state of knowledge and modelling of biomass fast pyrolysis. The objective of the work is to evaluate aerosol production and the effect of particle characteristics and process parameters during biomass fast pyrolysis.