The Experts below are selected from a list of 186 Experts worldwide ranked by ideXlab platform
Hiizu Nakanishi - One of the best experts on this subject based on the ideXlab platform.
-
Negative pressure in shear thickening band of a Dilatant Fluid.
Physical review. E, 2016Co-Authors: Shin-ichiro Nagahiro, Hiizu NakanishiAbstract:We perform experiments and numerical simulations to investigate spatial distribution of pressure in a sheared Dilatant Fluid of the Taylor-Couette flow under a constant external shear stress. In a certain range of shear stress, the flow undergoes the shear thickening oscillation around 20 Hz. We find that, during the oscillation, a localized thickened band rotates around the axis with the flow. Based upon experiments and numerical simulations, we show that a major part of the thickened band is under negative pressure even in the case of discontinuous shear thickening, which indicates that the thickening is caused by Reynolds dilatancy; the dilatancy causes the negative pressure in interstitial Fluid, which generates contact structure in the granular medium, then frictional resistance hinders rearrangement of the structure and solidifies the medium.
-
negative pressure in shear thickening band of a Dilatant Fluid
Physical Review E, 2016Co-Authors: Shin-ichiro Nagahiro, Hiizu NakanishiAbstract:We perform experiments and numerical simulations to investigate spatial distribution of pressure in a sheared Dilatant Fluid of the Taylor-Couette flow under a constant external shear stress. In a certain range of shear stress, the flow undergoes the shear thickening oscillation around 20 Hz. The pressure measurement during the oscillation at the wall of the outer cylinder indicates that a localized negative pressure region rotates around the axis with the flow. The maximum negative pressure is close to the Laplace pressure of the grain radius and nearly independent of the applied shear stress. Simulations of a phenomenological model reveal that the thickened region is dominated by a negative pressure band, which extends along the tensile direction in the flow. Such shear thickening with negative pressure contradicts a naive picture of jamming mechanism, where thickening is expected in the compressing direction with the positive pressure.
-
Experimental observation of shear thickening oscillation
EPL, 2013Co-Authors: Shin-ichiro Nagahiro, Hiizu Nakanishi, Namiko MitaraiAbstract:We report experimental observations of the shear thickening oscillation, i.e. the spontaneous macroscopic oscillation in the shear flow of severe shear thickening Fluid. Using a density-matched starch-water mixture, in the cylindrical shear flow of a few centimeters flow width, we observed that well-marked vibrations of frequency around 20 Hz appear via a Hopf bifurcation upon increasing externally applied shear stress. The parameter range and the frequency of the vibration are consistent with those expected by a simple phenomenological model of the Dilatant Fluid.
-
Fluid dynamics of Dilatant Fluids
Physical Review E, 2012Co-Authors: Hiizu Nakanishi, Shin-ichiro Nagahiro, Namiko MitaraiAbstract:Dense mixture of granules and liquid often shows a sever shear thickening and is called a Dilatant Fluid. We construct a Fluid dynamics model for the Dilatant Fluid by introducing a phenomenological state variable for a local state of dispersed particles. With simple assumptions for an equation of the state variable, we demonstrate that the model can describe basic features of the Dilatant Fluid such as the stress-shear rate curve that represents discontinuous severe shear thickening, hysteresis upon changing shear rate, instantaneous hardening upon external impact. Analysis of the model reveals that the shear thickening Fluid shows an instability in a shear flow for some regime and exhibits {\it the shear thickening oscillation}, i.e. the oscillatory shear flow alternating between the thickened and the relaxed states. Results of numerical simulations are presented for one and two-dimensional systems.
-
Fluid dynamics of Dilatant Fluids.
Physical review. E Statistical nonlinear and soft matter physics, 2012Co-Authors: Hiizu Nakanishi, Shin-ichiro Nagahiro, Namiko MitaraiAbstract:A dense mixture of granules and liquid often shows a severe shear thickening and is called a Dilatant Fluid. We construct a Fluid dynamics model for the Dilatant Fluid by introducing a phenomenological state variable for a local state of dispersed particles. With simple assumptions for an equation of the state variable, we demonstrate that the model can describe basic features of the Dilatant Fluid such as the stress-shear rate curve that represents discontinuous severe shear thickening, hysteresis upon changing shear rate, and instantaneous hardening upon external impact. An analysis of the model reveals that the shear thickening Fluid shows an instability in a shear flow for some regime and exhibits the shear thickening oscillation (i.e., the oscillatory shear flow alternating between the thickened and the relaxed states). The results of numerical simulations are presented for one- and two-dimensional systems.
Shin-ichiro Nagahiro - One of the best experts on this subject based on the ideXlab platform.
-
Negative pressure in shear thickening band of a Dilatant Fluid.
Physical review. E, 2016Co-Authors: Shin-ichiro Nagahiro, Hiizu NakanishiAbstract:We perform experiments and numerical simulations to investigate spatial distribution of pressure in a sheared Dilatant Fluid of the Taylor-Couette flow under a constant external shear stress. In a certain range of shear stress, the flow undergoes the shear thickening oscillation around 20 Hz. We find that, during the oscillation, a localized thickened band rotates around the axis with the flow. Based upon experiments and numerical simulations, we show that a major part of the thickened band is under negative pressure even in the case of discontinuous shear thickening, which indicates that the thickening is caused by Reynolds dilatancy; the dilatancy causes the negative pressure in interstitial Fluid, which generates contact structure in the granular medium, then frictional resistance hinders rearrangement of the structure and solidifies the medium.
-
negative pressure in shear thickening band of a Dilatant Fluid
Physical Review E, 2016Co-Authors: Shin-ichiro Nagahiro, Hiizu NakanishiAbstract:We perform experiments and numerical simulations to investigate spatial distribution of pressure in a sheared Dilatant Fluid of the Taylor-Couette flow under a constant external shear stress. In a certain range of shear stress, the flow undergoes the shear thickening oscillation around 20 Hz. The pressure measurement during the oscillation at the wall of the outer cylinder indicates that a localized negative pressure region rotates around the axis with the flow. The maximum negative pressure is close to the Laplace pressure of the grain radius and nearly independent of the applied shear stress. Simulations of a phenomenological model reveal that the thickened region is dominated by a negative pressure band, which extends along the tensile direction in the flow. Such shear thickening with negative pressure contradicts a naive picture of jamming mechanism, where thickening is expected in the compressing direction with the positive pressure.
-
Experimental observation of shear thickening oscillation
EPL, 2013Co-Authors: Shin-ichiro Nagahiro, Hiizu Nakanishi, Namiko MitaraiAbstract:We report experimental observations of the shear thickening oscillation, i.e. the spontaneous macroscopic oscillation in the shear flow of severe shear thickening Fluid. Using a density-matched starch-water mixture, in the cylindrical shear flow of a few centimeters flow width, we observed that well-marked vibrations of frequency around 20 Hz appear via a Hopf bifurcation upon increasing externally applied shear stress. The parameter range and the frequency of the vibration are consistent with those expected by a simple phenomenological model of the Dilatant Fluid.
-
Fluid dynamics of Dilatant Fluids
Physical Review E, 2012Co-Authors: Hiizu Nakanishi, Shin-ichiro Nagahiro, Namiko MitaraiAbstract:Dense mixture of granules and liquid often shows a sever shear thickening and is called a Dilatant Fluid. We construct a Fluid dynamics model for the Dilatant Fluid by introducing a phenomenological state variable for a local state of dispersed particles. With simple assumptions for an equation of the state variable, we demonstrate that the model can describe basic features of the Dilatant Fluid such as the stress-shear rate curve that represents discontinuous severe shear thickening, hysteresis upon changing shear rate, instantaneous hardening upon external impact. Analysis of the model reveals that the shear thickening Fluid shows an instability in a shear flow for some regime and exhibits {\it the shear thickening oscillation}, i.e. the oscillatory shear flow alternating between the thickened and the relaxed states. Results of numerical simulations are presented for one and two-dimensional systems.
-
Fluid dynamics of Dilatant Fluids.
Physical review. E Statistical nonlinear and soft matter physics, 2012Co-Authors: Hiizu Nakanishi, Shin-ichiro Nagahiro, Namiko MitaraiAbstract:A dense mixture of granules and liquid often shows a severe shear thickening and is called a Dilatant Fluid. We construct a Fluid dynamics model for the Dilatant Fluid by introducing a phenomenological state variable for a local state of dispersed particles. With simple assumptions for an equation of the state variable, we demonstrate that the model can describe basic features of the Dilatant Fluid such as the stress-shear rate curve that represents discontinuous severe shear thickening, hysteresis upon changing shear rate, and instantaneous hardening upon external impact. An analysis of the model reveals that the shear thickening Fluid shows an instability in a shear flow for some regime and exhibits the shear thickening oscillation (i.e., the oscillatory shear flow alternating between the thickened and the relaxed states). The results of numerical simulations are presented for one- and two-dimensional systems.
Osamu Oshiro - One of the best experts on this subject based on the ideXlab platform.
-
haptic canvas Dilatant Fluid based haptic interaction
International Conference on Computer Graphics and Interactive Techniques, 2010Co-Authors: Shunsuke Yoshimoto, Yuki Hamada, Takahiro Tokui, Tetsuya Suetake, Masataka Imura, Yoshihiro Kuroda, Osamu OshiroAbstract:Some kinds of substances naturally attract people to touch them. The slurry made from water and starch is one of the haptically fascinating substances, and presents the amusing but mysterious sensation like playing in the mud when you were in childhood. The mysterious haptic sensation comes from the property of the Fluid, "dilatancy", which is the change in the state from liquid-like to solid-like according to the external force. The purpose of this study is to establish the new haptic interaction by presenting both direct touch and mechanically variable haptic sensations with the slurry made from water and starch-i.e., "Dilatant Fluid".
-
SIGGRAPH Emerging Technologies - Haptic canvas: Dilatant Fluid based haptic interaction
ACM SIGGRAPH 2010 Emerging Technologies on - SIGGRAPH '10, 2010Co-Authors: Shunsuke Yoshimoto, Yuki Hamada, Takahiro Tokui, Tetsuya Suetake, Masataka Imura, Yoshihiro Kuroda, Osamu OshiroAbstract:Some kinds of substances naturally attract people to touch them. The slurry made from water and starch is one of the haptically fascinating substances, and presents the amusing but mysterious sensation like playing in the mud when you were in childhood. The mysterious haptic sensation comes from the property of the Fluid, "dilatancy", which is the change in the state from liquid-like to solid-like according to the external force. The purpose of this study is to establish the new haptic interaction by presenting both direct touch and mechanically variable haptic sensations with the slurry made from water and starch-i.e., "Dilatant Fluid".
Shunsuke Yoshimoto - One of the best experts on this subject based on the ideXlab platform.
-
Entertainment Media Arts with Multi-Sensory Interaction
Multiple Sensorial Media Advances and Applications, 2012Co-Authors: Masataka Imura, Shunsuke YoshimotoAbstract:In a field of application of virtual reality technologies, lots of multi-sensory entertainments have been developed. Researchers have been trying not only to develop the haptic, tactile, olfactory, and taste displays individually, but also to represent subtle sensations with combinations of multiple displays. In this chapter, we will introduce three entertainment applications which utilize multi-sensory stimulation for representing and improving the reality of virtual worlds. (1) Haptic Canvas: An entertainment system with Dilatant Fluid based haptic device, (2) Fragra: An entertainment system with a hand-mounted olfaction display, and (3) Invisible: An entertainment system that reproduce presence of virtual creatures by indirect information.
-
haptic canvas Dilatant Fluid based haptic interaction
International Conference on Computer Graphics and Interactive Techniques, 2010Co-Authors: Shunsuke Yoshimoto, Yuki Hamada, Takahiro Tokui, Tetsuya Suetake, Masataka Imura, Yoshihiro Kuroda, Osamu OshiroAbstract:Some kinds of substances naturally attract people to touch them. The slurry made from water and starch is one of the haptically fascinating substances, and presents the amusing but mysterious sensation like playing in the mud when you were in childhood. The mysterious haptic sensation comes from the property of the Fluid, "dilatancy", which is the change in the state from liquid-like to solid-like according to the external force. The purpose of this study is to establish the new haptic interaction by presenting both direct touch and mechanically variable haptic sensations with the slurry made from water and starch-i.e., "Dilatant Fluid".
-
SIGGRAPH Emerging Technologies - Haptic canvas: Dilatant Fluid based haptic interaction
ACM SIGGRAPH 2010 Emerging Technologies on - SIGGRAPH '10, 2010Co-Authors: Shunsuke Yoshimoto, Yuki Hamada, Takahiro Tokui, Tetsuya Suetake, Masataka Imura, Yoshihiro Kuroda, Osamu OshiroAbstract:Some kinds of substances naturally attract people to touch them. The slurry made from water and starch is one of the haptically fascinating substances, and presents the amusing but mysterious sensation like playing in the mud when you were in childhood. The mysterious haptic sensation comes from the property of the Fluid, "dilatancy", which is the change in the state from liquid-like to solid-like according to the external force. The purpose of this study is to establish the new haptic interaction by presenting both direct touch and mechanically variable haptic sensations with the slurry made from water and starch-i.e., "Dilatant Fluid".
Namiko Mitarai - One of the best experts on this subject based on the ideXlab platform.
-
Experimental observation of shear thickening oscillation
EPL, 2013Co-Authors: Shin-ichiro Nagahiro, Hiizu Nakanishi, Namiko MitaraiAbstract:We report experimental observations of the shear thickening oscillation, i.e. the spontaneous macroscopic oscillation in the shear flow of severe shear thickening Fluid. Using a density-matched starch-water mixture, in the cylindrical shear flow of a few centimeters flow width, we observed that well-marked vibrations of frequency around 20 Hz appear via a Hopf bifurcation upon increasing externally applied shear stress. The parameter range and the frequency of the vibration are consistent with those expected by a simple phenomenological model of the Dilatant Fluid.
-
Fluid dynamics of Dilatant Fluids
Physical Review E, 2012Co-Authors: Hiizu Nakanishi, Shin-ichiro Nagahiro, Namiko MitaraiAbstract:Dense mixture of granules and liquid often shows a sever shear thickening and is called a Dilatant Fluid. We construct a Fluid dynamics model for the Dilatant Fluid by introducing a phenomenological state variable for a local state of dispersed particles. With simple assumptions for an equation of the state variable, we demonstrate that the model can describe basic features of the Dilatant Fluid such as the stress-shear rate curve that represents discontinuous severe shear thickening, hysteresis upon changing shear rate, instantaneous hardening upon external impact. Analysis of the model reveals that the shear thickening Fluid shows an instability in a shear flow for some regime and exhibits {\it the shear thickening oscillation}, i.e. the oscillatory shear flow alternating between the thickened and the relaxed states. Results of numerical simulations are presented for one and two-dimensional systems.
-
Fluid dynamics of Dilatant Fluids.
Physical review. E Statistical nonlinear and soft matter physics, 2012Co-Authors: Hiizu Nakanishi, Shin-ichiro Nagahiro, Namiko MitaraiAbstract:A dense mixture of granules and liquid often shows a severe shear thickening and is called a Dilatant Fluid. We construct a Fluid dynamics model for the Dilatant Fluid by introducing a phenomenological state variable for a local state of dispersed particles. With simple assumptions for an equation of the state variable, we demonstrate that the model can describe basic features of the Dilatant Fluid such as the stress-shear rate curve that represents discontinuous severe shear thickening, hysteresis upon changing shear rate, and instantaneous hardening upon external impact. An analysis of the model reveals that the shear thickening Fluid shows an instability in a shear flow for some regime and exhibits the shear thickening oscillation (i.e., the oscillatory shear flow alternating between the thickened and the relaxed states). The results of numerical simulations are presented for one- and two-dimensional systems.
-
shear thickening oscillation in a Dilatant Fluid
Journal of the Physical Society of Japan, 2011Co-Authors: Hiizu Nakanishi, Namiko MitaraiAbstract:By introducing a state variable, we construct a phenomenological Fluid dynamical model of a Dilatant Fluid, i.e., a dense mixture of Fluid and granules that shows severe shear thickening. We demonstrate that the Fluid shows shear thickening oscillation, namely, the Fluid flow oscillates owning to the coupling between the Fluid dynamics and the internal dynamics of state. We also demonstrate that the jamming leads to a peculiar response to an external impact on the Fluid.
-
Fluid dynamics and jamming in a Dilatant Fluid
arXiv: Soft Condensed Matter, 2010Co-Authors: Hiizu Nakanishi, Namiko MitaraiAbstract:We present a phenomenological Fluid dynamics model for a Dilatant Fluid, i.e. a severe shear thickening Fluid, by introducing a state variable. The Navier-Stokes equation is coupled with the state variable field, which evolves in response to the local shear stress as the Fluid is sheared. The viscosity is assumed to depend upon the state variable and to diverge at a certain value due to jamming. We demonstrate that the coupling of the Fluid dynamics with the shear thickening leads to an oscillatory instability in the shear flow. The model also shows a peculiar response of the Fluid to a strong external impact.