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| Author(s): |
Luis Enrique Ortiz Vidal
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | São Carlos. |
| Institution: | Universidade de São Paulo (USP). Escola de Engenharia de São Carlos (EESC/SBD) |
| Defense date: | 2014-04-25 |
| Examining board members: |
Oscar Mauricio Hernandez Rodriguez;
Jader Riso Barbosa Junior;
Antonio Lopes Gama;
Rigoberto Eleazar Melgarejo Morales;
Leopoldo Pisanelli Rodrigues de Oliveira
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| Advisor: | Oscar Mauricio Hernandez Rodriguez |
| Abstract | |
Flow-induced vibration is intrinsic to piping problems. For example, in the oil and gas industry the FIV phenomenon can be found in pipe flow both in upstream and downstream applications. The structural vibration response contains information about the flow phenomenology. In the case of two-phase pipe flow, experimental results show a strong influence of mixture velocity, void fraction and flow pattern on pipe structural dynamics. However, efforts to obtain information of the flow from pipe response have been scanty. The goal of this study is to develop two-phase flow parameters predictive methods based on the structural pipe response. An experimental study of flow-induced vibration was carried out for several flow patterns in a clamp-clamp straight pipe (PVC Ø3/4\'\'), with air and water as working fluids. From an analytical approach, a quadratic relationship between shear velocity and standard deviation of acceleration is proposed and validated against the experimental data of single and two-phase flow. Since the shear velocity depends on the friction factor, a method to predict two-phase friction factor is presented. The method predicts accurately our experimental data with a mean absolute error up to 30%. Good agreement was also found when it was compared with some models and experimental data from the literature. Furthermore, an expression to correlate peak frequency and homogeneous void fraction as a function of added mass is offered. Finally, we present: (i) a slug flow identification technique based on the superposition of the turbulence and intermittent flow-induced vibration mechanisms, with performance of 81.8% and (ii) an experimental methodology to estimate mixture velocity (J) and homogeneous void fraction (β). The latter method shows better agreement for dispersed and slug flow-patterns, predicting J and β with a mean absolute error of 24.1% e 20.65%, respectively. (AU) | |
| FAPESP's process: | 09/17424-2 - Inverse method based on vibration and strain structural signals for the determination of two-phase flow patterns in pipes |
| Grantee: | Luis Enrique Ortiz Vidal |
| Support Opportunities: | Scholarships in Brazil - Doctorate |