Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-06-23T20:06:05Z No. of bitstreams: 1 DiegoDeLimaSousa_DISSERT.pdf: 2208966 bytes, checksum: 2885ffd2a2607c0a81d1654eca74abed (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-06-27T20:16:49Z (GMT) No. of bitstreams: 1 DiegoDeLimaSousa_DISSERT.pdf: 2208966 bytes, checksum: 2885ffd2a2607c0a81d1654eca74abed (MD5) / Made available in DSpace on 2016-06-27T20:16:49Z (GMT). No. of bitstreams: 1 DiegoDeLimaSousa_DISSERT.pdf: 2208966 bytes, checksum: 2885ffd2a2607c0a81d1654eca74abed (MD5) Previous issue date: 2016-01-28 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / A medi??o de vaz?o atrav?s da predi??o da press?o diferencial ? amplamente utilizada no dia-a-dia industrial, isso acontece, principalmente, devido ao fato de ser utilizado para os mais variados tipos de fluidos, tais como: fluxo de gases e l?quido com viscosidades distintas, at? mesmo, escoamento de fluidos com part?culas em suspens?o. A adequa??o desses equipamentos para a medi??o de vaz?o m?ssica em escoamentos bif?sicos ? de suma import?ncia para o desenvolvimento tecnol?gico e confiabilidade dos resultados. Quando se trata de escoamentos bif?sicos as rela??es existentes entre os fluidos e as intera??es entre eles s?o de suma import?ncia na predi??o da vaz?o. No presente trabalho, ? proposto a utiliza??o de placa de orif?cio conc?ntrica utilizada em tubula??es de pequenos di?metros da ordem de 25,4 mm onde escoa um fluxo bif?sico de ?gua e ar. A medi??o de vaz?o monof?sica foi feita com a utiliza??o dos dados referentes na norma NBR 5167-1 onde utilizou-se a equa??o de Stolz para a mensura??o do coeficiente de descarga. No escoamento bif?sico foi utilizado duas correla??es largamente empregadas no progn?stico da vaz?o m?ssica, o padr?o de Zhang (1992), e o modelo de Chisholm (1967), para o modelo de escoamento homog?neo. Observou-se que o comportamento encontrado no modelo de Zhang, condizem de forma mais real?stica a vaz?o m?ssica do fluxo bif?sico, pois, o modelo de Chisholm extrapola nos par?metros para a press?o a jusante, P2, a placa de orif?cio, assim como o coeficiente de descarga avaliada. A utiliza??o da modifica??o nas quedas de press?o, P1-P2, e coeficiente de descarga, permitiu uma melhor converg?ncia entre os valores obtidos para o fluxo bif?sico ?gua-ar. / The measurement of flow through the prediction of differential pressure is widely used in industrial day-to-day, this happens mainly due to the fact that it is used for various types of fluids, such as gas flow and liquid with viscosity distinct even flow of fluids with particles in suspension. The suitability of this equipment for measuring mass flow in two-phase flow is of paramount importance for technological development and reliability of results. When it comes to two-phase flow the relationship between the fluids and their interactions are of paramount importance in predicting the flow. In this paper, we propose the use of concentric orifice plate used in small diameter pipes of 25.4 mm order where a two-phase flow flows between water-air. The measurement of single-phase flow was made with the use of data in NBR 5167-1 which was used to Stolz equation for measuring discharge coefficient. In the two-phase flow was used two correlations widely used in the prognosis of mass flow, the pattern of Zhang (1992) and the model of Chisholm (1967), to the homogeneous flow model. It was observed that the behavior found in Zhang model are consistent more realistic way the mass flow of two-phase flow, since the model Chisholm extrapolate the parameters for the downstream pressure P2, the orifice plate, and the rated discharge coefficient. The use of the change in pressure drop P1-P2 and discharge coefficient, led to a better convergence of the values obtained for the two-phase air-water stream.