RESUMENEste es un estudio exploratorio para dar uso a la madera de Eucalyptus urophylla en la elaboración de tableros aglomerados de partículas. Por lo tanto, los objetivos fueron determinar sus propiedades físico-mecánicas y evaluar los resultados bajo norma Alemana Instituto Alemán de Normalización (DIN) y Venezolana Comisión Venezolana de Normas Industriales (CONEVIN). Para los tableros de densidad real de 731 kg/m 3 , la absorción de agua promedio a 2 y 24 horas no cumple de acuerdo a las normas, para el caso de los tableros de densidad real 831 kg/m 3 cumple con la norma. La variación del espesor (hinchamiento) promedio por inmersión en agua a 2 horas para los tableros con densidad de 731 kg/m 3 no cumple con lo exigido en ambas normas, pero si cumple con los requerimientos para 24 horas. Para el caso de los tableros con densidad de 838 kg/m 3 la variación de espesor a 2 y 24 horas cumplió con las normas. Respecto de las propiedades mecánicas, tanto el módulo de ruptura en flexión estática como la tensión perpendicular (adhesión interna) para ambos niveles de densidad superaron el valor mínimo aceptado en las normas, demostrando que las partículas de madera de Eucalyptus urophylla presentan características tecnológicas adecuadas para la fabricación de tableros de partículas de densidad media.Palabras clave: Adhesión interna, densidad, flexión estática, tensión perpendicular, urea formaldehído. ABSTRACTThis is an exploratory study on the feasibility of using Eucalyptus urophylla wood for the production of particleboards. Therefore, the aims were to determine their physical and mechanical properties and to evaluate the results with German Standards Institute (DIN) and Industrial Standards Commission Venezuelan (COVENIN). For boards with a real density of 731 kg/m 3 , the average water absorption at 2 and 24 hours does not meet the standards, in the case of real density boards 831 kg/m 3 that fulfilled with both standards. The average water absorption at 2 and 24 hours of boards for the actual density of 731 kg /m 3 did not comply with the requirements for both standards, unlike the particleboards with density equal 831 kg/m 3 that fulfilled with them. The average thickness variation (swelling) by immersion in water for 2 hours for boards with a density of 731 kg/m 3 did not meet the requirements of both 373 -386, 2017 standards, but meet the requirements for 24 hours. In the case of boards with a density of 838 kg /m 3 , thickness variation at 2 and 24 hours meet with the standards. Regarding mechanical properties both, the modulus of rupture in static bending and perpendicular tension (internal bond) for both real density levels exceed the minimum accepted by standards, demonstrating that E. urophylla wood exhibit suitable technological characteristics for particleboards medium density manufacture.Keywords: Density, internal bond, perpendicular tension, static bending, urea formaldehyde. INTRODUCCIÓNEn Venezuela, la industria de contrachapado y aglomerado se inicia en el año 1957, con la puesta en marcha...
-This work evaluates the impact of different radiation models on the results of Computational Fluid Dynamics (CFD) simulation of a sugarcane bagasse grate boiler. CFD has been applied extensively in the development of comprehensive models for biomass heterogeneous combustion. The model presented in this paper considers the turbulent flow represented by the standard k-ε model and the homogeneous combustion of the volatiles CH4 and CO by the Eddy Dissipation Model (EDM). Thermal profiles have been evaluated by comparing the results obtained without radiation with the results obtained with radiation represented by the P1 Approximation Method and by the Discrete Transfer Method (DTM). The discussion of the flue gas temperature and chemical composition profiles provides useful information regarding the characteristics of the internal flow and of the equipment operating conditions.
RESUMO -A Fluidodinâmica Computacional (Computational Fluid Dynamics, CFD) tem sido amplamente usada para o desenvolvimento de modelos compreensivos de combustão heterogênea de biomassa. Avalia-se o impacto de diferentes modelos de radiação nos resultados da simulação CFD de uma caldeira de bagaço de cana. Os modelos utilizados, para escoamento turbulento é modelo k- padrão, para a combustão dos gases é EDM (Eddy Dissipation Model) com mecanismo composto de duas reações químicas de combustão do CH 4 , representando a liberação de hidrocarbonetos leves, e CO. Para o arraste das partículas de bagaço no meio contínuo gasoso é utilizado modelo Schiller-Naumann com os diâmetros de acordo sua análise granulométrica. A radiação foi analisada através de casos simulados sem radiação e a representando pelos métodos P1 e de Transferências Discretas (DTM). A discussão a respeito dos perfis térmicos e de composições químicas dos gases de combustão indicam características e fenômenos internos da fornalha úteis na escolha de condições de operação do equipamento.
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