dc.contributor | Neves Junior, Flavio | |
dc.contributor | Morales, Rigoberto Eleazar Melgarejo | |
dc.creator | Coutinho, Fábio Rizental | |
dc.date.accessioned | 2014-11-06T15:16:53Z | |
dc.date.accessioned | 2022-12-06T15:43:29Z | |
dc.date.available | 2014-11-06T15:16:53Z | |
dc.date.available | 2022-12-06T15:43:29Z | |
dc.date.created | 2014-11-06T15:16:53Z | |
dc.date.issued | 2014-08-01 | |
dc.identifier | COUTINHO, Fábio Rizental. Um novo método ultrassônico para detecção da posição da interface em escoamentos bifásicos ar-água. 2014. 136 f. Tese (Doutorado em Engenharia Elétrica e Informática Industrial) – Universidade Tecnológica Federal do Paraná, Curitiba, 2014. | |
dc.identifier | http://repositorio.utfpr.edu.br/jspui/handle/1/972 | |
dc.identifier.uri | https://repositorioslatinoamericanos.uchile.cl/handle/2250/5269738 | |
dc.description.abstract | Ultrasonic measurement techniques for velocity estimation are currently widely used in flow study due to its non-intrusive nature. The difficulty on the application of this methodology to a two-phase air-water flow is in deciding from which phase the velocity data measured comes from. This problem involves the task of evaluating gas-liquid interface position. The algorithm known as Velocity Matched Spectrum (VMS) is a velocity estimator that stands out from other methods by returning a spectrum of velocities for each interrogated volume sample. In this work a method based on velocity spectrum curve shape is used to generate a spatial-temporal mapping, which, after spatial filtering, yields an accurate contour of the air-water interface. Therefore, a measurement system that implements VMS estimator was developed and validated through a rotating cylinder and a horizontal single-phase pipe turbulent flow experiments. Interface detection of free-rising bubbles in quiescent liquid presents some difficulties for interface detection due to abrupt changes in interface inclination. It is showed that the proposed technique yields a RMS error between 1.71 to 3.39 and a probability of detection failure or false detection between 0.89% to 11.9% in determining the spatial-temporal gas-liquid interface position in the flow of free rising bubbles in stagnant liquid. This result is valid for both free path and with transducer emitting through a metallic plate or a Plexiglas pipe. | |
dc.publisher | Universidade Tecnológica Federal do Paraná | |
dc.publisher | Curitiba | |
dc.publisher | Programa de Pós-Graduação em Engenharia Elétrica e Informática Industrial | |
dc.subject | Ultrassom | |
dc.subject | Doppler, Ultrassonografia | |
dc.subject | Escoamento multifásico | |
dc.subject | Escoamento bifásico | |
dc.subject | Gás - Escoamento | |
dc.subject | Medição | |
dc.subject | Análise espectral | |
dc.subject | Engenharia elétrica | |
dc.subject | Ultrasonics | |
dc.subject | Doppler ultrasonography | |
dc.subject | Multiphase flow | |
dc.subject | Two-phase flow | |
dc.subject | Gas flow | |
dc.subject | Mensuration | |
dc.subject | Spectrum analysis | |
dc.subject | Electric engineering | |
dc.title | Um novo método ultrassônico para detecção da posição da interface em escoamentos bifásicos ar-água | |
dc.type | doctoralThesis | |