Estimativa do fator de Perfil k na medição ultrassônica por tempo de trânsito em escoamentos assimétricos utilizando a técnica de problemas inversos acoplada a simulação numérica

• Ano de defesa: 2017
• Autor(a) principal: Stange, Rafael
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal do Espírito Santo; BR; Mestrado em Engenharia Mecânica; Centro Tecnológico; UFES; Programa de Pós-Graduação em Engenharia Mecânica
• Palavras-chave em Português: Ultrasonic flow meter; Acoustic channel; Turbulent flow; Inverse problem; Levemberg-Marquardt; Canal acústico; Escoamento turbulento; Problemas inversos (Equações diferenciais); Medidor de vazão ultrassônico; Mecânica dos sólidos; 621
• Link de acesso: http://repositorio.ufes.br/handle/10/9756

Flow measurement plays an important operation in the scope of industrial applications,being regulated by several organizations. In order to satisfy such requirements, ultrasonicmeasurement technology has undergone great evolution in recent years, strongly motiva-ted by its inherent low pressure drop, due to its configuration. However, line accidentscause interference in flow readings, due to changes in the velocity profile. New researchand models are developed in order to understand and consider such disturbances, and toadapt the conditions of industrial facilities. In order to add new e↵orts, the present workpresents an approximation for the so called profile factork,throughtechniquesofinverseproblems. This approach seeks to quantify changes in velocity profile and to consider suchdisturbance e↵ects on factork. In this work, simulations of Reynolds Number between1⇥104and 2⇥106under influence of an upstream curves were approached. Approxi-mations were made with simulations at 10D,20Dand 80Ddownstream from the curve.The results obtained are promising. The di↵erences between the simulations obtained bythe present proposal for the factor k and the reference flow values were below 2% in mostof the simulated cases.