Axisymmetric Model
Mostrando 1-12 de 27 artigos, teses e dissertações.
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1. Numerical Study on Response Characteristics of Solid Rocket Pintle Motor
ABSTRACT: Pintle technology is currently a versatile technology used in a solid rocket motor (SRM) to control the desired thrust by changing the nozzle throat area, while effectively controlling the chamber pressure at the same time. The sudden movement of the pintle can induce rapid changes in the flow field and the occurrence of pressure oscillations insid
J. Aerosp. Technol. Manag.. Publicado em: 26/08/2019
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2. Penetration performance of axisymmetric U-shape-nose grooved projectile into aluminum target: Theoretical model and experiment
Abstract The penetration performance of projectiles is closely related to their nose shape as it influences the kinetic energy penetration of a rigid projectile. One new type of projectile, which is entitled U-shape-nose grooved projectile, is introduced in this study. A theoretical model, which describes the structural characterization of U-shape-nose groo
Lat. Am. j. solids struct.. Publicado em: 28/06/2018
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3. 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
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4. NOVEL SIMILARITY-SOLUTION WHICH IS APPLICABLE FOR FREE CONVECTION OVER A BODY OF ARBITRARY SHAPE: THERMAL NON-EQUILIBRIUM IN A POROUS MEDIUM
Abstract The study of the natural convection flow and heat transfer from hot surfaces in a porous medium has been of considerable interest in energy-related engineering problems. This paper is concerned with the free convection heat transfer over an arbitrary hot surface in a porous medium. It is assumed that the fluid and solid phases are not in local therm
Braz. J. Chem. Eng.. Publicado em: 2015-03
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5. The use of an axisymmetric formulation of the Finite Volume Method for the thermal analysis of the retina and ocular tissues following implantation of retinal prosthesis
This study analyzes the heat transfer in human eyes following implantation of retinal prostheses using an axisymmetric formulation of the Finite Volume Method. The model used consisted of a vertex centered unstructured grid finite volume method in an edge-based data structure and an explicit time integration. The results of the finite volume thermal analysis
J. Braz. Soc. Mech. Sci. & Eng.. Publicado em: 2012-09
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6. Optimizing the e-beam profile of a single carbon nanotube field emission device for electric propulsion systems
Abstract: Preliminary studies on field emission (FE) arrays comprised of carbon nanotubes (CNT) as an electron source for electric propulsion system show remarkably promising results. Design parameters for a carbon nanotube (CNT) field-emission device operating on triode configuration were numerically simulated and optimized in order to enhance the e-beam fo
J. Aerosp. Technol. Manag.. Publicado em: 2010-04
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7. Evaluation axisymmetric analysis of thermal stress residual near fiber/epoxy interface
The finite element method is used to compute and analyze the residual stresses particularly near the fiber/epoxy interface, and these stresses need to be taken into account. An axisymmetric model has been used for stress computation and analysis, in this work two cases are considered by using an epoxy matrix with respectively glass and carbon fibers with a d
Materials Research. Publicado em: 2009-06
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8. 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
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9. Método de otimização topológica aplicado ao projeto de sonotrodos para transdutores piezelétricos. / Topology optimization method applied to the design of transducers sonotrodos piezoelectric.
This work aims at the development of a method based on Topology Optimization to design a mechanical structure, called sonotrode, which is a device usually connected to a high power piezoelectric transducer (mechanical device capable of converting electric energy into mechanical displacement or vice-versa). A sonotrode transmits mechanical vibrations of a pie
Publicado em: 2008
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10. Comparison of turbulent particle dispersion models in turbulent shear flows
This work compares the performance of two Lagrangian turbulent particle dispersion models: the standard model (e.g., that presented in Sommerfeld et al. (1993)), in which the fluctuating fluid velocity experienced by the particle is composed of two components, one correlated with the previous time step and a second one randomly sampled from a Wiener process,
Brazilian Journal of Chemical Engineering. Publicado em: 2007-09
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11. COMPORTAMENTO ELONGACIONAL DOS MATERIAIS TERMOPLÁSTICOS COMPÓSITOS / ELONGATIONAL BEHAVIOR OF COMPOSITE THERMOPLASTIC MATERIALS
Composite thermoplastic materials, like glass fiber reforced polypropropylene, are used increasingly in several industries. In particular, glass fiber reinforcement is used to improve the mechanical properties of thermoplastics, due to the high fiber modulous and to the better adesion between the fibers and the polymeric matrix. However, few data of material
Publicado em: 2007
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12. UMA FORMULAÇÃO DE ELEMENTOS FINITOS AXISSIMÉTRICOS PARA ANÁLISE DE TUBOS LAMINADOS EM MATERIAIS COMPÓSITOS / AN AXISYMMETRIC FINITE ELEMENT FORMULATION FOR THE ANALYSIS OF LAMINATED COMPOSITE TUBES
The use of composite materials in structures has grown in the engineering practice due to its characteristics, of high strength, low density and a good stability to thermal effects. A class of composites, the fibrous laminates, is generally used in tubes subjected to many types of loadings as internal and/or external pressure, traction, torsion, temperatures
Publicado em: 2006