HUSCAP logo Hokkaido Univ. logo

Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Engineering / Faculty of Engineering >
Peer-reviewed Journal Articles, etc >

Negative viscosity of a liquid crystal in the presence of turbulence

Files in This Item:
PhysRevE.99.012701.pdf1.63 MBPDFView/Open
Please use this identifier to cite or link to this item:

Title: Negative viscosity of a liquid crystal in the presence of turbulence
Authors: Orihara, Hiroshi Browse this author →KAKEN DB
Harada, Yuko Browse this author
Kobayashi, Fumiaki Browse this author
Sasaki, Yuji Browse this author →KAKEN DB
Fujii, Shuji Browse this author →KAKEN DB
Satou, Yuki Browse this author
Goto, Yoshitomo Browse this author
Nagaya, Tomoyuki Browse this author
Issue Date: 2-Jan-2019
Publisher: American Physical Society (APS)
Journal Title: Physical Review E
Volume: 99
Issue: 1
Start Page: 012701
Publisher DOI: 10.1103/PhysRevE.99.012701
Abstract: We report on the discovery of enormous negative viscosity in a nematic liquid crystal in the presence of turbulence induced by electric fields. As the negative viscosity in this system is so large, we are able to observe several phenomena originating from it. For example, we observe a spontaneous shear flow that rotates the upper disk of a rheometer, as well as the reversal of the rotational direction upon applying an external torque in the opposite direction. Hysteresis loops are also observed in the shear-stress-shear-rate curves, which is reminiscent of those seen for ferromagnetic and ferroelectric materials. The similarities between the phenomena observed for our system and ferroic materials are comprehensively demonstrated, although the two systems are fundamentally different in that the former is out of equilibrium. We elucidate the origin of the negative viscosity and propose a simple model that reproduces the phenomena observed in this active fluid.
Rights: ©2019 American Physical Society
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 折原 宏

Export metadata:

OAI-PMH ( junii2 , jpcoar_1.0 )

MathJax is now OFF:


 - Hokkaido University