1. Transient 3D lamellar structure in PMER fluids
V. Conclusions
A rigorous Onsager Principle expansion theory under shear and electric was developed for PMER systems. We got the results consistent with experiment perfectly, and the transient 3D lamellar structures simultaneous, and find the lamellar structures have closely relation with the shear stress, angle velocity and shear band. Finally the ideas can be extended to other systems, such as cross structure.
Publications and references:
[1] Zhang, J, Phys. Rev. Let (2008).
[2] Tan& Zhou, J. Phys. Chem. B (2009).
[3] Tang. X, Inter. J. Mod. Phys. B (1999).
[4] Liu. DK, Li C & Zhou, Inter. J. Mod. Phys. B (2011).
Transient 3D lamellar structure in PMER fluids
Li Cong( ), Zheng Jie, Huang Jiping and Zhou Luwei
Phys. Dept., Fudan Univ., Shanghai, People’s Republic of China
The PMER effect has giant potential application in active control of conventional and intelligent devices, especially in Car Clutch. Lamellar structure plays a crucial role in polar-molecular electrorheological (PMER) fluids research, because it is now often an essential foundation of nearly every mode of inquiry and discovery in science. However, it is too difficult to observe the transient 3D structure for the opacity of PMER, the match of refractive index of oil and PEMR and the restriction of interrelated apparatus . So our motivation is to establish a rigorous approach(Onsager principle)[1-2] which can calculate dynamical progress of a PMER clutch at both electric and shear field simultaneous rigorously and provide the intrinsic properties of PMER effect, such as shear stress, transient 3D structure, etc.
I. Calculated results---Dynamical progress
II. Calculated results---Equilibrium lamellar structures
At six different conditions, and the results is perfectly consistent with experiments of Tang XL, and Liu DK[3-4].
III. Calculated results---Transient 3D lamellar structures
Dynamical simultaneous measured lamellar structures under the condition of 152r.p.m. and 1.0 kV/mm
at 38.2s from lower to upper electrode, h is the distance from the observe LS to the bottom electrode. And
the according volume fraction, angle velocity and shear stress at every LS along the radius direction.
IV. Calculated results ---Shear band and fluidization in PMER