Name: Rafael Stange
Type: MSc dissertation
Publication date: 20/03/2017

Namesort descending Role
Rogério Ramos Advisor *
Wellington Betencurte da Silva Co-advisor *

Examining board:

Namesort descending Role
Marcio Ferreira Martins Internal Examiner *
Rogério Ramos Advisor *
Wellington Betencurte da Silva Co advisor *

Summary: Flow measurement plays an important operation in the scope of industrial applications, being regulated by several organizations. In order to satisfy such requirements, ultrasonic measurement technology has undergone great evolution in recent years, strongly motivated by its inherent low pressure drop, due to its configuration. However, line accidents cause interference in flow readings, due to changes in the velocity profile. New research and models are developed in order to understand and consider such disturbances, and to adapt the conditions of industrial facilities. In order to add new e↵orts, the present work presents an approximation for the so called profile factor k, through techniques of inverse problems. This approach seeks to quantify changes in velocity profile and to consider such disturbance e↵ects on factor k. In this work, simulations of Reynolds Number between 1⇥104 and 2⇥106 under influence of an upstream curves were approached. Approximations were made with simulations at 10D, 20D and 80D downstream from the curve. The results obtained are promising. The di↵erences between the simulations obtained by the present proposal for the factor k and the reference flow values were below 2% in most of the simulated cases.
Keywords: Ultrasonic flow meter, acoustic channel, turbulent flow, inverse problem, Levemberg-Marquardt.

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