Granular Flows
Mostrando 1-9 de 9 artigos, teses e dissertações.
-
1. Nonlinear instabilities on a granular bed sheared by a turbulent liquid flow
The granular media is of great importance in our quotidian, and their transport by a fluid flow is frequently found in nature and in industry. When the shear stresses exerted by the fluid flow on a granular bed are bounded to some limits, a mobile granular layer known as bed-load takes place in which the grains stay in contact with the fixed part of the gran
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2011-09
-
2. Experimental and numerical study of spouted bed fluif dynamics
Spouted beds, originally invented in Canada by Mathur and Gishler (1955) as an alternative to fluidized beds for handling coarse particles, are now widely studied in a variety of physical operations, such as drying, coating and granulation. In this work the particle velocity, minimum spouting flow rate and characteristic fluid-dynamic curves of the spouted b
Brazilian Journal of Chemical Engineering. Publicado em: 2008-03
-
3. Estudo experimental e de simulação da fluidodinâmica de um leito de jorro com tubo Draft
The spouted bed has been used in several processes as drying, granulation, catalytic polymerization, residues treatment and materials coating. This application is due to the excellent fluid-particle contact and to the characteristics of the solids circulation. In spite of its extensive application, the spouted bed has some scale-up limitations, so its necess
Publicado em: 2007
-
4. Estudo experimental e de simulaÃÃo da fluidodinÃmica de um leito de jorro com tubo Draft
The spouted bed has been used in several processes as drying, granulation, catalytic polymerization, residues treatment and materials coating. This application is due to the excellent fluid-particle contact and to the characteristics of the solids circulation. In spite of its extensive application, the spouted bed has some scale-up limitations, so itâs nece
Publicado em: 2007
-
5. Some modeling and numerical aspects of the two-fluid simulation of the gas-solids flow in a CFB riser
The gas-solids flow in a CFB riser is simulated applying two-fluid modeling. Two different procedures are used for the calculation of the solids phase pressure and stress tensor: the traditional procedure and an algebraic version of the kinetic theory of granular flows. Three different numerical meshes and two different discretization schemes for the advecti
Brazilian Journal of Chemical Engineering. Publicado em: 2006-12
-
6. TWO-DIMENSIONAL SIMULATION OF DEBRIS FLOW USING DISTINCT ELEMENT METHOD / SIMULAÇÃO BIDIMENSIONAL DE CORRIDAS DE DETRITOS USANDO O MÉTODO DE ELEMENTOS DISCRETOS / SIMULACIÓN BIDIMENSIONAL DE FLUJOS DE DETRITOS COM EL USO DEL MÉTODO DE ELEMENTOS DISCRETOS
En este trabajo se disponibiliza una herramienta numérica para la simulación bidimensional de flujos de detritos usando el Método de Elementos Discretos (DEM) creado por Cundall en 1979, donde las ecuaciones del movimiento para cada elemento son resueltas simultáneamente con la técnica numérica de Relajación Dinámica (MRD) debido al comportamiento tr
Publicado em: 2006
-
7. Modelagem fenomenologica e simulação bidimensional da fluidodinamica de reatores de leito fluidizado circulante
Circulating Fluidized Bed (CFB) reactors are used in a variety of industrial applications especially related to combustion and catalytic cracking. The fluid dynamic prediction of CFB is fundamental in its development and optimisation. In this work, a computer code for the simulation of the fluid dynamics of Circulating Fluidized Bed Reactors was developed. T
Publicado em: 1998
-
8. Dry granular flows can generate surface features resembling those seen in Martian gullies
Over the past decade or more, contradictory evidence of Martian climate, indicating that surface temperatures seldom if ever approach the melting point of water at midlatitudes, and geomorphic features, consistent with liquid flows at these same latitudes, have proven difficult to reconcile. In this article, we demonstrate that several features of liquid-ero
National Academy of Sciences.
-
9. Segregation-driven organization in chaotic granular flows
An important industrial problem that provides fascinating puzzles in pattern formation is the tendency for granular mixtures to de-mix or segregate. Small differences in either size or density lead to flow-induced segregation. Similar to fluids, noncohesive granular materials can display chaotic advection; when this happens chaos and segregation compete with
The National Academy of Sciences.