Transient Time Distribution
Mostrando 1-12 de 75 artigos, teses e dissertações.
-
1. Modeling and hydraulic performance evaluation of a dripper device coupled to a branched water distribution network
Resumo A irrigação é responsável por aproximadamente 70% do consumo de água doce do mundo e é um dos principais fatores por trás da crescente escassez de água global. As técnicas e sistemas de irrigação são extremamente diferenciadas e complexas. Neste contexto, as ferramentas de dinâmica de fluidos computacional (CFD) ganham relevância, permit
Rev. Ambient. Água. Publicado em: 03/06/2019
-
2. Numerical analysis of the liquid ejection due to the gaseous jet impact through computational fluid dynamics
Abstract Metal droplets generated by an impinging jet, play an important role in metal refining processes, mainly in oxygen steelmaking, where the droplets are ejected into the slag phase. Since the available interfacial area of droplets is very high in this process, the generated droplets enhance the rates of heat transfer and chemical reactions. Therefore,
REM, Int. Eng. J.. Publicado em: 2018-03
-
3. Simulation of species concentration distribution in reactive flows with unsteady boundary conditions
Abstract The determination of species concentration profiles in reactive flows with variable inlets is a problem of practical interest to many fields such as in flow reactor transient operation and in cyclic degradable pollutants disposals in watercourses. In these cases, the inflow condition often consists of a time-dependent function, which may imply unste
Braz. J. Chem. Eng.. Publicado em: 2017-10
-
4. Transient Stress Intensity Factors of Functionally Graded Hollow Cylinders with Internal Circumferential Cracks
Abstract In this paper, transient thermomechanical stress intensity factors for functionally graded cylinders with complete internal circumferential cracks are obtained using the weight function method. The finite difference method is used to calculate the time dependent temperature distribution and thermal stresses along the cylinder thickness. Furthermore,
Lat. Am. j. solids struct.. Publicado em: 2016-09
-
5. Simplified Analytical Approach to Evaluate the Nonlinear Dynamics of Elastic Cylindrical Shells Under Lateral Blast Loads
Abstract This paper presents an analytical solution to predict the nonlinear forced vibrations of elastic thin-walled cylindrical shells under suddenly applied loads. Interest in this problem is motivated by effects due to explosions on fluid-storage metal tanks. The model is based on the energy criterion due to Lagrange, in which the kinematic nonlinear rel
Lat. Am. j. solids struct.. Publicado em: 2016-07
-
6. Simplified Mathematical Modeling for an Electromagnetic Forming System with Flat Spiral Coil as Actuator
This study presents mathematical modeling and calculation procedure for problems of electromagnetic forming of thin circular metal sheets using a flat spiral coil as actuator. The methodbased on the Biot-Savart Law focuses specifically on the calculation of the electromagnetic field generated by the flat coil and analysis of the circuit that models the elect
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2011-09
-
7. Distribution of prokaryotic organisms in a tropical estuary influenced by sugar cane agriculture in northeast Brazil
In a joint Brazilian-German case study, distribution patterns of microorganisms were compared with environmental variables in the tropical coastal Manguaba lagoon in northeast Brazil, which is situated downstream of several sugar cane processing plants . 16S rDNA and 16S rRNA single strand conformation polymorphism (SSCP) gene fingerprinting were used to fol
Brazilian Journal of Microbiology. Publicado em: 2010-12
-
8. A proposal for optimized analysis of transient currents in conductive materials. / Uma proposta para análise otimizada de correntes transitórias em materiais condutores.
In this work, a methodology is developed, based on the application of the moment method associated to a finite difference approximation, for time domain analysis of transient current distribution in conducting media. The computational procedure allows that long conductors with any cross section can be considered, approximated by filamentary elements. Thus, t
Publicado em: 2010
-
9. MODELO HIDRÁULICO BASEADO NO MÉTODO DAS CARACTERÍSTICAS E ALGORITMOS GENÉTICOS PARA OTIMIZAÇÃO DA OPERAÇÃO DE REDES DE ABASTECIMENTO DE ÁGUA E DE ESTAÇÕES DE BOMBEAMENTO
A hydraulic model was developed for simulation of water supply networks using the Method of Characteristics (MOC), introducing new features to the CALHIDREDMT model, proposed by Righetto (1994). The model uses the concept of pseudo-transient, using a fictitious value for the wave celerity. Simulations were performed in networks equipped with reservoirs, tank
Publicado em: 2010
-
10. CalibraÃÃo de Rugosidade de TubulaÃÃes de Redes de DistribuiÃÃo de Ãgua, Via MÃtodo Transiente Inverso com AplicaÃÃo de Algoritmo GenÃtico / Roughness pipe calibration in a water distribution network with Genetic Algorithm and Inverse Transient Analysis
An important step in the modelling of hydraulic networks, calibration makes it possible to predict the behavior of physical parameters essential to decision-making. The present study used inverse transient analysis with a genetic algorithm to calibrate pipe roughness in a water distribution network with simulations based on variable parameters such as mutati
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/09/2009
-
11. Microbiological evaluation of the juice from different varieties and stalk sections of sugar cane cultivated under organic management / Avaliação dos aspectos microbiológicos do caldo de diferentes variedades e partes do colmo da cana-de-açúcar sob manejo orgânico
For the artisanal cachaça production, which is a beverage obtained after distillation of the fermented sugar cane juice, natural starter ferment (caipira ferment) is utilized, in which crushed corn, rice bran and citric fruit juice are added to sugar cane juice. The primary source of microorganisms, yeasts especially, is the sugar cane juice itself, and alt
Publicado em: 2009
-
12. Deterministic partially self-avoiding walks: analytical results for the effect of tourists memory in the exploration of disordered media / Caminhadas deterministas parcialmente auto-repulsivas: resultados analíticos para o efeito da memória do turista na exploração de meios desordenados
Considere um meio desordenado constituído por $N$ pontos cujas coordenadas são geradas aleatoriamente de maneira uniforme e independente nas arestas unitárias de um hipercubo $d$-dimensional. As probabilidades de vizinhança entre os pares de pontos deste meio são expressas através da fórmula de Cox. Um caminhante parte de um dado ponto deste meio deso
Publicado em: 2008