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Electrical noise induced by unstable flow of elastic polymer solutions through capillaries
Capillary flow of 0.3% aqueous solutions of poly(ethylene oxide), 4×106 MW, generates a fluctuating electrical signal (noise) between electrodes at the ends of the capillary. The frequency spectra of the noise are approximately of the 1/f α type. Within certain flow rate ranges, two sets of harmonic...
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Published in: | Journal of applied physics 1985-01, Vol.58 (5), p.2060-2063 |
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Main Authors: | , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Capillary flow of 0.3% aqueous solutions of poly(ethylene oxide), 4×106 MW, generates a fluctuating electrical signal (noise) between electrodes at the ends of the capillary. The frequency spectra of the noise are approximately of the 1/f α type. Within certain flow rate ranges, two sets of harmonic peaks appear in the spectra. It is shown that these peaks are associated with the transverse and longitudinal modes of motion of the elastic solution entering the capillary. This equivalence has been verified by frequency analysis of the intensity of a laser beam transmitted through the entry region, and by high-speed photography. The noise is assumed to reflect fluctuations in the streaming potential, caused by fluctuations in flow rate. |
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ISSN: | 0021-8979 1089-7550 |
DOI: | 10.1063/1.335990 |