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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Estudo Numérico do Escoamento Bifásico de Água e Óleo em Conexões Tê na Presença de Vazamento. / Numerical Study of Two-phase Flow of Water and Oil in Tee Junctions With Leak.

ARAÚJO, Morgana de Vasconcellos. 30 April 2018 (has links)
Submitted by Johnny Rodrigues (johnnyrodrigues@ufcg.edu.br) on 2018-04-30T17:11:57Z No. of bitstreams: 1 MORGANA DE VASCONCELLOS ARAÚJO - DISSERTAÇÃO PPGEQ 2014..pdf: 6485490 bytes, checksum: ac573f517948e0ae4fa9b0adcf3f0f41 (MD5) / Made available in DSpace on 2018-04-30T17:11:57Z (GMT). No. of bitstreams: 1 MORGANA DE VASCONCELLOS ARAÚJO - DISSERTAÇÃO PPGEQ 2014..pdf: 6485490 bytes, checksum: ac573f517948e0ae4fa9b0adcf3f0f41 (MD5) Previous issue date: 2014-07-24 / CNPq / Capes / Diante do número de acidentes com dutos na indústria petrolífera, diversas pesquisas vêm buscando o aperfeiçoamento das tecnologias de detecção de vazamento, fazendo-se necessário o conhecimento do comportamento do(s) fluido(s) no interior da tubulação. O trabalho tem como objetivo geral o estudo termofluidodinâmico do escoamento água-óleo em uma conexão tê na presença de vazamento. Para isto, foi construído um domínio tridimensional e foi simulado o escoamento não isotérmico de água testando-se os modelos de turbulência k-Ɛ padrão, SST e RNG k-Ɛ e utilizando as equações da conservação de massa, momento e energia. Foram simulados os escoamentos bifásicos de água-óleo em uma conexão tê com vazamento, variando-se a fração volumétrica de óleo e as temperaturas das misturas nas seções de entrada. Comparando os perfis de velocidade e temperatura com dados experimentais observou-se que o modelo k-Ɛ padrão representou satisfatoriamente o comportamento do escoamento. Notou-se que quanto menor a fração volumétrica de óleo no escoamento, maior a pressão a montante do vazamento e que a região de encontro entre o duto principal e o duto secundário apresentou os maiores gradientes de pressão. / From the large number of accidents involving pipelines in the oil industry, many researcher have the objective of improving the tecnologies of leak detection, where the knowledge of the behavior (s) fluid (s) inside the pipe is necessary. The work aims to describe the thermofluid dynamics study of oil-water flow in a pipe with tee junction and with the presence of leakage. For this, a three-dimensional domain was built and it was simulated the nonisothermal flow of water by testing models of turbulence k-Ɛ standard, SST e RNG k-Ɛ, using the equations of conservation of mass, momentum and energy. Comparing the profiles of velocity and temperature with experimental data, it were observed that the k-Ɛ standard model well represented the flow pattern behavior satisfactorily. The water-oil two-phase flow in a tee junction with leakage was simulated, varying the volume fraction of oil mixtures and temperatures of the input sections. It was noted that the smaller the volume fraction of oil in the flow, the greater the pressure upstream of the leak and the region where the main duct is linked to the secondary duct showed higher pressure gradients.

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