Turbulent flow in stirred vessels agitated by a single, low-clearance hyperboloid impeller

• Tipo: Artigo em Revista Científica Internacional
• Data: 2000

Autores

Fernando T. Pinho (Autor) FEUP; Francisco Piqueiro (Autor) FEUP; M. F. Proenca (Autor) Outra; A. M. Santos (Autor) Outra

Revista

Título: Chemical Engineering Science

Vol. 55 Nº 16

Páginas: 3287-3303

ISSN: 0009-2509

Editora: Elsevier

Indexação

ISI Web of Knowledge - 2 Citações

ISI Web of Science

Scopus - 4 Citações

COMPENDEX

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Outras ciências da engenharia e tecnologias

CORDIS: Ciências Tecnológicas > Engenharia > Engenharia química

Outras Informações

ID Authenticus: P-000-ZAM

DOI: 10.1016/s0009-2509(99)00570-9

Abstract (EN): Detailed angle-resolved measurements of the mean and rms of the three components of the velocity vector were carried out by laser-Doppler anemometry in a stirred vessel mechanically agitated by a ribbed, low power consumption hyperboloid impeller at a Reynolds number of 50,000. Due to the small clearance of the agitator the flow pattern in the vessel was typical of that encountered when using an axial turbine although the flow in the vicinity of the impeller was alike that in a radial device with the mean flow discharge following a lambda- type pattern. In most of the vessel the flow was gentle with mean velocities of the order of 5% of the tip velocity, increasing to about 20% V-imp towards the tip of the impeller because of the ribs. Their small size limited the extent of periodic flow to a region delimited by the bottom and z/R = 0.2 in the vertical direction, and r/R = 0.85-1.4 in the radial direction, plus the volume below the impeller. In these regions the turbulence was not isotropic and reached the highest values so that the maximum turbulence kinetic energy was 65% higher than for the corresponding hyperboloid flow in the absence of shear ribs.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 17