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| Presentation | 2012-10-22 14:50 Observation of shear-orientational coupling under high shear rate Taichi Hirano, Keiji Sakai (Inst. Indust. Sci.)  US2012-65 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | Molecular motion in a micro particle of fluid, in the radius of approximate 10~$\mu $m, is determined by the surface tension and the viscosity rather than the gravity and inertia. The characteristic time scale of the behavior of the fluid particle is in the order of a few micro seconds. We achieved the measurement of hyper rheology using a newly developed experimental system. The system can emit droplets with a controlled size and speed, and the head on collision of the microdroplets brings the united fluid into the very high shear rate up to $10^6\ \mathrm{s}^{-1}$. The direct observation of the motion of fluid under the high-shear pulse is expected to be an useful method for investigation of the rheological properties. In such a case of liquid crystals, the coupling between shear flow and molecular rotation plays an important role in determining the fluid properties. We observed the molecular orientation induced by the high-shear pulse, whose time scale is in the similar order of that of the orientational relaxation. The magnitude of the induced orientaional order is also theoretically estimated with the coupling viscosity and the experimental conditions. | |
| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | microdroplet / hyper shear pulse / shear-orientation coupling / / / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 112, no. 254, US2012-65, pp. 9-12, Oct. 2012. | |
| Paper # | US2012-65 | |
| Date of Issue | 2012-10-15 (US) | |
| ISSN | Print edition: ISSN 0913-5685 Online edition: ISSN 2432-6380 | |
| Copyright and reproduction |
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) | |
| Download PDF | US2012-65 |
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| Conference Information | |
| Committee | US |
| Conference Date | 2012-10-22 - 2012-10-22 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Kanazawa Inst. Tech. |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | General |
| Paper Information | |
| Registration To | US |
| Conference Code | 2012-10-US |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Observation of shear-orientational coupling under high shear rate |
| Sub Title (in English) | |
| Keyword(1) | microdroplet |
| Keyword(2) | hyper shear pulse |
| Keyword(3) | shear-orientation coupling |
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| 1st Author's Name | Taichi Hirano |
| 1st Author's Affiliation | Institute of Industrial Science, the University of Tokyo (Inst. Indust. Sci.) |
| 2nd Author's Name | Keiji Sakai |
| 2nd Author's Affiliation | Institute of Industrial Science, the University of Tokyo (Inst. Indust. Sci.) |
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| Speaker | Author-1 |
| Date Time | 2012-10-22 14:50:00 |
| Presentation Time | 25 minutes |
| Registration for | US |
| Paper # | US2012-65 |
| Volume (vol) | vol.112 |
| Number (no) | no.254 |
| Page | pp.9-12 |
| #Pages | 4 |
| Date of Issue | 2012-10-15 (US) |
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