Concentric Cylinders
Mostrando 1-12 de 12 artigos, teses e dissertações.
-
1. Director profile of a nematic between two concentric cylinders with inhomogeneous boundary conditions
The tilt angle profile in a nematic cell limited by two concentric cylindrical surfaces with inhomogeneous distribution of easy axes is investigated in the one-constant approximation. The results are presented in terms of the Green function approach by considering the strong anchoring case and the presence of an external electric field for small distortions.
Brazilian Journal of Physics. Publicado em: 2009-06
-
2. Simplified engine/nacelle heat transfer case analysis via CFD modeling for supporting the preliminary design of nacelle cooling/ventilation system.
An aeronautical engine is a complex machine composed of different components operating at different temperatures that in conjunction with the nacelle creates a crowded region with the coupled heat transfer mechanisms to be covered by the nacelle cooling/ventilation system. The final configuration of this system is defined through a demanding refinement of th
Publicado em: 2009
-
3. EXPERIMENTAL STUDY OF AXIAL FLOW THROUGH AND ANNULAR REGION WITH INNER CYLINDER ROTATION / ESTUDO EXPERIMENTAL DO ESCOAMENTO AXIAL ATRAVÉS DE REGIÃO ANULAR COM ROTAÇÃO DO CILINDRO INTERNO
The flow between concentric cylinders with an inner rotating cylinder with an imposed pressure-driven axial flow was studied experimentally. The radius ratio was (n) = 0, 64 and the aspect ration was (r) = 265. Friction factor and velocity fields were studied for four rotations of the inner cylinder and for laminar, transitional, and turbulent flow. Velocity
Publicado em: 2007
-
4. Evaluation of the average shear rate in stirred and aerated tank bioreactor. / Avaliação da velocidade de cisalhamento média em biorreator convencional tipo tanque agitado e aerado.
In biochemical processes, shear rate ( γ&) in the system is an important variable on design and operation of bioreactors. Shear can result in damage to the cells and the microorganisms, taking to the viability loss and even to the cellular breaking and the microbial death. In the present work was proposed a methodology to quantify average shear rate ( a
Publicado em: 2007
-
5. TAYLOR-COUETTE INSTABILITY IN VISCOPLASTIC FLUID FLOW / INSTABILIDADE DE TAYLOR-COUETTE EM ESCOAMENTOS DE FLUIDOS VISCOPLASTICOS
A superposição de um escoamento circular de Couette e um fluxo com gradiente de pressão axial, através de um espaço anular ocorre em muitas aplicações práticas, tais como: reatores químicos catalíticos, filtros, extratores líquido- líquido, mancais e o fluxo de retorno de lamas de perfuração entre a coluna de perfuração rotatória e a formaç
Publicado em: 2002
-
6. Comportamento termo-mecanico do "compound" (chocolate composto)
Experiments were conducted in order to know the rheological bahaviour of compound that is a chocolate substitute where the cocoa butter is totally or partially replaced for a vegetable fat. It was used two kinds of fat; the first one is fractionated palm kemel oil and the second one is hidrogenated cottonseed oil, in order to observe how kind of fat and its
Publicado em: 2000
-
7. Estudo da produção de cefalosporina C : composição do meio, produtividades especificas e caracterização reologica em processos conduzidos em batelada e batelada alimentada
Bioprocess for cephalosporin C production in fed-batch fermentor was studied concermng medium composition, specific productivity and rheological characterization. The batch process was performed in shake flasks and in 5 liters stirred tank reactor provided with pH, temperature, aeration and agitation control. In the shake flask experiments the performance of
Publicado em: 1998
-
8. Reometria de suco concentrado de frutas
This is an experimental investigation on rheometry of marketed concentrated fruit juice of cashew, orange, lime and passion fruit. The purpose was the comparison of results obtained from three measuring systems: parallel plates, Searle concentric cylinders and double gap. Concentration ranged within 35 to 65 °Brix and temperature within 50 to 80°C. The Sea
Publicado em: 1996
-
9. NUMERICAL SIMULATIONS VIA FINITE ELEMENT OF VISCOUS FLOW BETWEEN CONCENTRIC AND ECCENTRIC CYLINDERS WITH ROTATING INNER AND VARIABLE VISCOSITY / SIMULAÇÕES NUMÉRICAS VIA ELEMENTOS FINITOS DE ESCOAMENTOS VISCOSOS ENTRE CILINDROS CONCÊNTRICOS E EXCÊNTRICOS COM INTERNO GIRANTE E VISCOSIDADE VARIÁVEL
Efetuou-se um estudo numérico do escoamento entre cilindros concêntricos e excêntricos girantes com efeitos de dissipação viscosa presente. Assumiu-se que o cilindro interno estava girando com uma velocidade angular constante e que o externo estava fixo. Assumimos a condição de contorno de não deslizamento para velocidade em ambas as paredes. A tempe
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/10/1987
-
10. ULTRASTRUCTURE OF TREPONEMA MICRODENTIUM AND BORRELIA VINCENTII
Bladen, Howard A. (National Institute of Dental Health, Bethesda, Md.), and Edward G. Hampp. Ultrastructure of Treponema microdentium and Borrelia vincentii. J. Bacteriol. 87:1180–1191.—A small oral Treponema (FM) and Borrelia vincentii (N9) were harvested after 3 to 7 days of incubation and either embedded in Vestopal W or negatively stained with phosph
-
11. Ex vivo evaluation of a Taylor-Couette flow, immobilized heparinase I device for clinical application
Efficient and safe heparin anticoagulation has remained a problem for continuous renal replacement therapies and intermittent hemodialysis for patients with acute renal failure. To make heparin therapy safer for the patient with acute renal failure at high risk of bleeding, we have proposed regional heparinization of the circuit via an immobilized heparinase
The National Academy of Sciences.
-
12. Axonal transport of herpes simplex virions to epidermal cells: evidence for a specialized mode of virus transport and assembly.
To examine the transmission of herpes simplex virus (HSV) from axon to epidermal cell, an in vitro model was constructed consisting of human fetal dorsal root ganglia cultured in the central chamber of a dual-chamber tissue culture system separated from autologous skin explants in an exterior chamber by concentric steel cylinders adhering to the substratum t