In situquantitation of the index of mixing in a single-screw extruder by magnetic resonance imaging
| Autor: | W Wang, M H G Amin, Laurance D. Hall, S. Ablett |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
In situ
Aqueous solution Materials science medicine.diagnostic_test Applied Mathematics Resolution (electron density) Plastics extrusion Mixing (process engineering) Analytical chemistry Magnetic resonance imaging Laminar flow Volumetric flow rate Nuclear magnetic resonance medicine Instrumentation Engineering (miscellaneous) |
| Zdroj: | Measurement Science and Technology. 15:1871-1876 |
| ISSN: | 1361-6501 0957-0233 |
| Popis: | Magnetic resonance imaging (MRI) has been used to quantitate in situ the goodness of laminar mixing of two streams of 1% aqueous sodium carboxymethylcellulose with different MnCl2 concentrations, flowing through a single-screw extruder (0.04 m diameter, length to diameter ratio of 4.575). Two-dimensional MR images (0.0002 × 0.0002 × 0.003 m3 resolution) were acquired using gradient echo MRI protocols which had been calibrated to map MnCl2 concentrations. The resultant distributions were then used to calculate indices of mixing (normalized variances of concentration) in the part of the extruder under study. The smallest index (0.34) was measured near the outlet at the faster speed (30 rpm) and slower flow rate (47 ml min−1); and the largest index (0.73) was near the inlet for 20 rpm and 76 ml min−1. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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