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EnglishFor chemical, cosmetic, pharmaceutical, and food industries the rheological properties of a product represent an important quality factor. Unfortunately such features are often difficult to estimate, in particular in a continuous production process. In this work, we present an ultrasound (US) Doppler method suitable for in-line rheological assessment of highly filled opaque suspensions. The velocity profile developed by highly filled and opaque polyurethane based adhesives and sealants flowing in a pipe was measured through a proprietary US board. The high resolution profile was then fitted to the power law model and the wall shear rate (WSR), a reliable rheological indicator in high shear-thinning suspensions, was obtained. The accuracy of the method was evaluated comparing the measured WSR to reference values obtained from off-line laboratory rheometry. The error from 78 measurements at flow rates between 1 and 35 ml/s featured a mean +3.6% bias and a standard deviation below 12%. Moreover, measurements are only minimally affected by the variation of several US parameters over a wide range of values demonstrating the robusness of the technique.
In-line Rheometry for Highly Filled Suspensions Through Doppler Ultrasound / S. Ricci; B. Birkhofer; D. Lootens; P.Tortoli. - ELETTRONICO. - (2010), pp. 2044-2047. ((Intervento presentato al convegno Ultrasonics Symposioum 2010 tenutosi a San Diego (CA) nel Ottobre [10.1109/ULTSYM.2010.5935438].
| Titolo: | In-line Rheometry for Highly Filled Suspensions Through Doppler Ultrasound | |
| Autori di Ateneo: | ||
| Autori: | RICCI, STEFANO; B. Birkhofer; D. Lootens; TORTOLI, PIERO | |
| Data di pubblicazione: | 2010 | |
| Titolo del libro: | 2010 IEEE International Ultrasonics Symposium Proceedings | |
| Titolo del congresso: | Ultrasonics Symposioum 2010 | |
| Luogo del congresso: | San Diego (CA) | |
| Data del congresso: | Ottobre | |
| Abstract: | For chemical, cosmetic, pharmaceutical, and food industries the rheological properties of a product represent an important quality factor. Unfortunately such features are often difficult to estimate, in particular in a continuous production process. In this work, we present an ultrasound (US) Doppler method suitable for in-line rheological assessment of highly filled opaque suspensions. The velocity profile developed by highly filled and opaque polyurethane based adhesives and sealants flowing in a pipe was measured through a proprietary US board. The high resolution profile was then fitted to the power law model and the wall shear rate (WSR), a reliable rheological indicator in high shear-thinning suspensions, was obtained. The accuracy of the method was evaluated comparing the measured WSR to reference values obtained from off-line laboratory rheometry. The error from 78 measurements at flow rates between 1 and 35 ml/s featured a mean +3.6% bias and a standard deviation below 12%. Moreover, measurements are only minimally affected by the variation of several US parameters over a wide range of values demonstrating the robusness of the technique. | |
| Handle: | http://hdl.handle.net/2158/395204 | |
| Appare nelle tipologie: | 4a - Articolo in atti di congresso |
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