Flow regimes in a multi-gap circular Couette-Taylor system with opposite rotating cylinders

This work investigates the flow structure in the gaps of a multi-cylinder circular Couette-Taylor system, which is a model of a two-rotor heat generator. The initial information for studying the flow structure was data on the magnitude of the resistance torque to rotors opposed rotation, as well as on the nature of the amplitude-frequency spectrum of pulsations of this torque, depending on the viscosity of the working fluid and the rotational speed of the heat generator rotors. The obtained data allow comparing the nature of hydrodynamic processes in the single and obtained multi-gap circular space of Couette-Taylor and calculating the parameters of structural formations in the multi-gap working space of the heat generator. At relative rotational speeds of rotors (3-50) rad/s, the main energy of flow pulsations (up to 90%) is found in the amplitude-frequency spectra in the frequency range (12-70) Hz. It is associated with vortices first described by Taylor, which are extended low-frequency regularly alternating spirals and vortex structures with right and left rotation in the region of higher frequencies (200– 500) Hz; their frequency is determined by the width of the annular gaps of the multi-cylinder system.

Circular Space Curve Frame (3D) with any Load and Spring Supports by Transfer Matrix Method and Finite Element Method

In this paper, authors present a new numerical method, combining the Transfer Matrix Method and Finite Element Method (TMM - FEM), to analyze spatially circular curved bar, with general load and elastic support. Analysis space curved bar is complex problem because conventional methods will not simultaneously calculate the entire structure, or difficulty in establish the stiffness matrix, or the size of stiffness matrix is too large due to multiple elements. TMM - FEM method is proposed to promote the advantages of each method. Due to being directly generated from the parametric equations of the bar axis, the analytical results are accurate. Results are programed in Matlab and verified with SAP2000 programe.

Ecoethos da Amazônia: interação e ludicidade juvenil mediada por um jogo de simulação

Ecoethos da Amazônia is a simulation game that explores the symbology of the five elements (Earth, Water, Air, Fire, and Care) by the use of tridimensional models. The set consisted of a circular space with four stations, each representing one of the four natural elements. The players must solvethe challengespresented to them in each station. The Water pollution station deals with waste and water supply; the Air station brings questions about greenhouse gas emission, carbon sequestration, and land use; the Earth station presents questions focused on biodiversity, relief, and water resources; the Fire station alternative energy options are explored, always considering the biodiversity, the physical-geographical, the social and the economic characterization of the environment. The aim of this study was to evaluate players’ experience and understanding of the concepts explored during the activity. The theoretical approach was based on the Gamer User Experience Evaluation and the Bloom Taxonomy. Participated in this study 168 students (6º to9º grades) of public schools. Some pre-established categories were considered for the analysis: opinion about the experience, game layout, difficulties handling parts, feelings triggered, understanding the representation of the parts, playfulness, and potential in changing behavior. Ecoethos da Amazônia was considered a game that teaches, entertains and enables responsible interaction. The game engages the participant’s attention and the situations presented were challenging buteasy to understand. The results showed that the game experience can promote environmental responsibility while pointing out the potential of the game to raise awareness, inform and reflect on social and environmental issues.