10 th European Fluid Mechanics Conference A review

Outline 1. 2. 3. 4. Background Bubble theory Measurements and model Outlook SITRANS FC

Background • Sometimes flow through flowmeters will consist of mixtures, e. g. water mixed

Bubble theory © Siemens AG 2014 All rights reserved. Page 4 September 2014 Nils

Measurements and model • Bubble theory (phase decoupling): • Negative error • Compressibility: •

Outlook • Add important effects not included: • Pressure loss • Pipe geometry •

Thank you for your attention! Nils T. Basse Senior Research Engineer Siemens A/S, Flow

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Background • Sometimes flow through flowmeters will consist of mixtures, e. g. water mixed with air bubbles, oil or sand • Mixtures will cause (i) measurement errors and (ii) damping © Siemens AG 2014 All rights reserved. Page 3 September 2014 Nils T. Basse / Siemens A/S, Flow Instruments

Measurements and model • Bubble theory (phase decoupling): • Negative error • Compressibility: • Positive error © Siemens AG 2014 All rights reserved. Page 5 September 2014 Nils T. Basse / Siemens A/S, Flow Instruments

Outlook • Add important effects not included: • Pressure loss • Pipe geometry • Flow pattern • Interplay between above-mentioned effects J. Weisman, in Handbook of Fluids in Motion, pp. 409 -425, 1983 © Siemens AG 2014 All rights reserved. Page 6 September 2014 Nils T. Basse / Siemens A/S, Flow Instruments

Thank you for your attention! Nils T. Basse Senior Research Engineer Siemens A/S, Flow Instruments Nordborgvej 81 6430 Nordborg Phone: +45 7488 2610 E-mail: nils. basse@siemens. com/answers © Siemens AG 2014 All rights reserved. Page 7 September 2014 Nils T. Basse / Siemens A/S, Flow Instruments