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A viscosity correction factor for shear-thinning liquid flows in safety valves |
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| Authors: | D. Moncalvo L. Friedel |
| Affiliation: | 1. Technisches Büro, LESER GmbH & Co. KG, Wendenstraße 133-135, 20537 Hamburg, Germany;2. Institut für Strömungsdynamik, Technische Universität Hamburg-Harburg, Eißendorfer Straße 38, 21073 Hamburg, Germany;1. Chemical Engineering and Materials Science Department, Stevens Institute of Technology, Hoboken, NJ, USA;2. Systems Engineering Department, Stevens Institute of Technology, Hoboken, NJ, USA;3. Department of Systems Engineering, United States Military Academy, West Point, NY, USA;1. College of Biotechnology and Pharmaceutical Engineering, Nanjing University of Technology, No.200, North Zhongshan Road, Nanjing 210009, China;2. Jiangsu Engineering Technology Research Center of Polypeptide Pharmaceutical, Nanjing 210038, China;1. Department of Chemical and Environmental Engineering, University of Oviedo, Julián Clavería 8, 33006 Oviedo, Spain;2. Instituto Nacional del Carbón, INCAR-CSIC, Apartado 73, 33080 Oviedo, Spain |
| Abstract: | At the moment there is lack in the existing standards of a sizing procedure for media of more complex rheological behavior than Newtonian. A formulation for the generalized Reynolds number to calculate the viscosity correction factor and size safety valves for the flows of shear-thinning media is proposed in this work. The various formulations in the literature are validated in their accuracy of estimation of the mass flow rates of aqueous solutions of polyvinylpyrrolidone. Among them the generalized Reynolds number defined using the wall viscosity of the annulus between the seat and the disk gives the highest accuracy without overestimating the measured mass flow rates. On the base of these results this generalized Reynolds number is recommended for introduction in the next review of both ISO 4126-1 Part 1 and API 520 for the sizing of safety valves for shear-thinning media. |
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