On-site calibration of a phase fraction meter by an inverse technique

Autor(es)

V. P. Rolnik ; P. Seleghim Jr. ^[2]

• Tipo de documento: Artigo Científico
• Fonte: Journal of the Brazilian Society of Mechanical Sciences; v. 24, n. 4, p. 266-270, 2002-11-00.

Resumo

The formal calibration procedure of a phase fraction meter is based on registering the outputs resulting from imposed phase fractions at known flow regimes. This can be straightforwardly done in laboratory conditions, but is rarely the case in industrial conditions, and particularly for on-site applications. Thus, there is a clear need for less restrictive calibration methods regarding to the prior knowledge of the complete set of inlet conditions. A new procedure is proposed in this work for the on-site construction of the calibration curve from total flown mass values of the homogeneous dispersed phase. The solution is obtained by minimizing a convenient error functional, assembled with data from redundant tests to handle the intrinsic ill-conditioned nature of the problem. Numerical simulations performed for increasing error levels demonstrate that acceptable calibration curves can be reconstructed, even from total mass measured within a precision of up to 2%. Consequently, the method can readily be applied, especially in on-site calibration problems in which classical procedures fail due to the impossibility of having a strict control of all the input/output parameters. (AU)

• Processo FAPESP: 98/12921-1 - Aplicacao de tecnicas de controle ativo em sistemas de transporte e manipulacao de escoamentos multifasicos.
• Beneficiário: Paulo Seleghim Júnior
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 99/02821-2 - Contribuição ao desenvolvimento de uma nova técnica de reconstrução tomográfica para sondas de visualização direta
• Beneficiário: Vanessa Rolnik Artioli
• Modalidade de apoio: Bolsas no Brasil - Doutorado