Vita. / Digitized by Kansas Correctional Industries

Thesis (M.S.)--University of Missouri-Columbia, 2006. / The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (February 26, 2007) Includes bibliographical references.

Thesis (M. Ing.)--University of Stellenbosch, 1997. / Bibliography. Also available via the Internet.

Thesis (M. Sc.)--University of Hong Kong, 1966. / Mimeographed.

Thesis (M.S.)--University of Wisconsin--Madison, 1969. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (Ph.D.)--University of Wollongong, 2001. / Typescript. Bibliographical references: leaf 218-232.

An experimental program has been undertaken to gain a more fundamental understanding of dense-phase pneumatic transport of cohesionless solids. A 50.8 mm internal diameter circulating unit with both horizontal and vertical sections has been constructed . The pipe material is transparent lexan which allows for visual observation of the flow pattern. The particles used were a mixture of 95% white and 5% black polyethylene granules (particle diameter approximately 3 mm). The black particles were used to aid the visual observation of the flow pattern. The flow patterns ranged from dilute-phase flow to dense-phase plug flow. High-speed photographic techniques have been used to document the flow patterns in both the horizontal and vertical sections. Pressure drop measurements across a 70 cm test section have been coordinated with the film work. At the higher superficial air velocities (approximately 15 m/sec), the particles flow in a dilute suspension within the air stream. The pressure drop across the 70 cm section fluctuates very rapidly. For the horizontal dilute-phase flow, the mean pressure drop is approximately 0.12 kPa with fluctuations ranging from 0 to 0.3 kPa. For the vertical dilute-phase flow, the mean pressure drop is approximately 0.25 kPa with fluctuations ranging from 0 to 0.5 kPa. Upon reducing the superficial air velocity to 6.8 m/sec, the flow pattern in the horizontal section changes to a type of strand flow. The particles are conveyed in a dilute phase above a stationary layer. Large peaks in the pressure drop data (approximately 1 to 2 kPa) correspond to increases in the dilute-phase solids concentration. At the lower superficial air velocities (below 5 m/sec) , the solids flow pattern changes to dense-phase flow. The particles move in the form of plugs that occupy the entire pipe cross-section. For the horizontal flow, the plug length ranged from 0.17 to 0.60 m and the pressure drop across the plugs ranged from 1 to 5.2 kPa. The pressure gradient range can be predicted from the equations of Konrad et al. (1980). The analysis of the vertical dense-phase flow films is not as straightforward as the horizontal films. However, the flow pattern resembles that described by Konrad (1987) and there is qualitative agreement with the concepts outlined by Konrad (1987). / Master of Science

Vita. / Digitized by Kansas Correctional Industries

Thesis (Ph.D.)--University of Wollongong, 2009. / Typescript. Includes bibliographical references: leaf 308-322.

Orientador: Leonardo Goldstein Junior / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica / Made available in DSpace on 2018-08-06T10:08:50Z (GMT). No. of bitstreams: 1 Domingues_RogerioBolchi_M.pdf: 2485496 bytes, checksum: 9c0c7fc9fca353e68329fa5025091bfb (MD5) Previous issue date: 2006 / Resumo: Os injetares gás-sólido tipo Venturi são equipamentos utilizados na indústria para transportar materiais particulados. Eles constituem um equipamento de baixo custo e de construção simples, que não possui componentes móveis. No entanto promovem um alto consumi energético. A literatura existente apresenta informações sobre o comportamento deste equipamento na injeção de alguns materiais, tais como, areia, cimento, esferas de vidro, polietileno e trigo. Neste trabalho será testado um catalisador de FCC. A introdução de coeficientes de perda de pressão em um modelo mecanicista proposto por Bohnet e Wagenknecht (1978) tomou as equações obtidas similares às equações clássicas de perda de pressão em dutos. Os testes forneceram dados sobre a distribuição de pressão no injetor, incluindo na câmara de abastecimento, em função da descarga de gás. Foi verificado o efeito da carga de sólidos na distribuição de pressão ao longo do injetor. E por fim foi verificado o comportamento da distribuição de pressão ao longo do injetor e a variação dos coeficientes de perda de pressão em função da variação dos parâmetros geométricos S e dG2' Após coletados os dados foi apresentado uma proposta de um procedimento para o dimensionamento de injetores gás-sólidos tipo Venturi / Abstract: Gas-solid Venturi injectors are used in industry as feeding devices of granulated or pulverized solids into pipelines under pressure for pneumatic conveying. Their advantages are no moving parts, low cost and a simple geometry. On the other hand they have a large energy consumption. Not much work has been reported in the literature on Venturi injectors. Information is available for sand, cement, glass, polyethylene and wheat. Energy conversion efficiencies were introduced in Bohnet and Wagenknecht (1978) equations to evaluate the pressure drop distribution. In this work FCC particulate was injected and measurements were performed to obtain an altemative parameter - the pressure drop coefficients - which allows calculating the total pressure variation in the injector, including the hopper. The solids loading influence on the pressure variation was studied, as well as the influence of the inlet air nozzle diameter, and of the distance between this nozzle and the Venturi entrance section. A procedure to estimate a gassolids injector was proposed. / Mestrado / Termica e Fluidos / Mestre em Engenharia Mecânica