The performance of outlets under constant head is investigated in this study. Behavior of single outlet is analyzed / subsequently effect of multiple outlets on a single outlet is examined. Parameters taken into account are constant head of water, orifice shape, orifice length, number of open outlets and discharge. The outlet type, which is examined, can be classified as a short tube orifice. Two different orifice diameters and tube lengths are used. Outlets had the diameter, 6.00 and 10.35mm. The ratio of orifice length to diameter (l/d) was 5 and 8. Number of outlets is 5, which are opened in several combinations. A dimensional analysis shows that discharge coefficient, Cd is a function of diameter-length ratio and the Reynolds Number. In this study, high Reynolds Number (2300&lt / Re&lt / 18600) range is examined and the results are compared with the available data in the literature. Furthermore, performance of the group outlets is investigated.

Made available in DSpace on 2015-05-08T14:59:33Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 1073681 bytes, checksum: 6d982431f3e257485aec3e0a61ea8934 (MD5) Previous issue date: 2011-11-01 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / This work points to a detailed study of the mechanisms involved in the expansion and flow in short tube orifices. The flow unlike the vast majority of available works in the literature is at the first step addressed through a viscous formulation using boundary layer equations. The equations in this proposal are presented in a way that make it difficult or impossible to approach a solution via the traditional mathematical techniques, such as separation of variables, Green's functions among others. To resolve the issue will be used in formulating the proposed Generalized Integral Transform technique, in addition to the equations of continuity and the momentum, be able to solve the energy equation in the enthalpy formulation. The enthalpy formulation is used to capture the effect of expansion in the short tube orifices. The results will be presented as adimensionalized for hydrodynamic and thermal fields and parameters of practical interest in engineering. / O presente trabalho aponta para um estudo aprofundado dos mecanismos envolvidos queda de pressão e escoamento em dutos curtos de orifício. O escoamento diferentemente da grande maioria dos trabalhos disponíveis na literatura é na primeira etapa abordado através de uma formulação viscosa através de equações de camada limite. As equações na presente proposta se apresentam numa forma que dificultam ou até impossibilitam uma abordagem de soluções via técnicas matemáticas tradicionais, tais como, separação de variáveis, funções de Green entre outras. Para resolver o problema na formulação proposta é empregada a técnica da Transformada Integral Generalizada, para além das equações da continuidade de movimento, poder resolver simultaneamente a equação da energia na formulação entálpica. A formulação entálpica será utilizada para quantificar o efeito da expansão nos short tube orifices. Os resultados obtidos serão apresentados na forma adimensionalizada para os campos Hidrodinâmico e Térmico e parâmetros de interesse práticos na engenharia.