Pressure and Shear Rate Effects on Viscosity and Structure of Imidazolium-based Ionic Liquids

2021 ◽  
pp. 113345
Author(s):  
Kalil Bernardino ◽  
Mauro C.C. Ribeiro
Keyword(s):  
Ionic Liquids ◽  
Shear Rate ◽  
Rate Effects

Hematocrit, Volume Expander, Temperature, and Shear Rate Effects on Blood Viscosity

2000 ◽  
Vol 91 (3) ◽  
pp. 539-545 ◽  
Author(s):  
David M. Eckmann ◽  
Shelly Bowers ◽  
Mark Stecker ◽  
Albert T. Cheung
Keyword(s):  
Shear Rate ◽  
Blood Viscosity ◽  
Volume Expander ◽  
Rate Effects

Analysis of shear rate effects on drag reduction in turbulent channel flow with superhydrophobic wall

2013 ◽  
Vol 25 (6) ◽  
pp. 944-953 ◽  
Author(s):  
Nowrouz Mohammad Nouri ◽  
Mohammad Saadat Bakhsh ◽  
Setareh Sekhavat
Keyword(s):  
Shear Rate ◽  
Drag Reduction ◽  
Channel Flow ◽  
Turbulent Channel Flow ◽  
Rate Effects

Relating structure and dynamics of ionic liquids under shear by means of reverse non-equilibrium molecular dynamics simulations

2021 ◽  
Author(s):  
Kalil Bernardino ◽  
Mauro Ribeiro
Keyword(s):  
Molecular Dynamics ◽  
Ionic Liquids ◽  
Shear Rate ◽  
Molecular Dynamics Simulations ◽  
Structure And Dynamics ◽  
Non Equilibrium Molecular Dynamics ◽  
Dynamics Simulations ◽  
Non Equilibrium

The effect of shear rate on the viscosity and the structure of 1-ethyl-3-methylimidazolium based ionic liquids with three different anions (tetrafluoroborate, dicyanamide, and bis(trifluoromethylsulfonyl)imide) was studied by means of reverse...

Shear Rate Effects on the Post-peak Shear Behaviour and Acoustic Emission Characteristics of Artificially Split Granite Joints

2019 ◽  
Vol 52 (7) ◽  
pp. 2155-2174 ◽  
Author(s):  
Fanzhen Meng ◽  
Louis Ngai Yuen Wong ◽  
Hui Zhou ◽  
Jin Yu ◽  
Guangtan Cheng
Keyword(s):  
Acoustic Emission ◽  
Shear Rate ◽  
Shear Behaviour ◽  
Emission Characteristics ◽  
Rate Effects

Study on Shear Rate Effects of Reticulate Red Clay

2011 ◽  
Vol 261-263 ◽  
pp. 1410-1413 ◽  
Author(s):  
Jian Zhong Li ◽  
Xi Qing Tang
Keyword(s):  
Shear Rate ◽  
Direct Shear ◽  
Shear Tests ◽  
Red Clay ◽  
Vertical Pressure ◽  
Shear Rates ◽  
Direct Shear Tests ◽  
Reticulate Red Clay ◽  
Rate Effects ◽  
Reticulate Structure

Direct shear tests were performed to study the shear rate effects of reticulate red clay around Dongting Lake. In the direct shear tests, four sets of undisturbed specimen of reticulate red clay were sheared under the different vertical pressure of 50kPa, 100kPa, 200kPa and 300kPa. Specimens were sheared with six different shear rates of 0.04mm/s, 0.02mm/s, 0.01mm/s, 0.007mm/s, 0.004mm/s and 0.003mm/s under each vertical pressure. Test results show that: (1) shear strength of reticulate red clay increases along with the vertical pressure; (2) shear rate effects of reticulate red clay are affected by vertical pressure significantly; (3) due to its reticulate structure of reticulate red clay, it shows some differences in shear rate effects comparing with other clay.

scholarly journals Non-equilibrium molecular dynamics simulations of ionic liquids under extreme shear

2020 ◽  
Author(s):  
Kalil Bernardino ◽  
Mauro Carlos Costa Ribeiro
Keyword(s):  
Molecular Dynamics ◽  
Ionic Liquids ◽  
Shear Rate ◽  
Structural Changes ◽  
Polymer Chains ◽  
Practical Applications ◽  
Shear Rates ◽  
Non Equilibrium Molecular Dynamics ◽  
Dynamics Simulations ◽  
Non Equilibrium

Ionic liquids are called designer solvents because their physical properties can be tuned by the selection of different combinations cation and anion. Understanding the relation between the chemical structure and the viscosity and how the shear rate can affect the relative arrangements of the ions are important for practical applications specially as lubricants. Reverse non-equilibrium molecular dynamics (RNEMD) simulations were performed to study the effect of the shear rate over the viscosity and the structure at molecular level of four different imidazolium based ionic liquids. Since it is already well known that the absence of explicit electronic polarizability in usual classical force fields leads to artificially slow dynamics in ionic liquids, a Drude polarizable force field was employed in all simulations. Non-newtonian behavior is observed at shear rates at GHz scale, with a progressive reduction of the viscosity at the same time that the structure of second and further coordination shells are partially disrupted. The liquids that displayed the greater structural changes with increasing shear rate also displayed the strongest variation in the viscosities. At the highest shear rates studied, the imidazolium rings tends to align parallel to the induced flux, an effect similar to the well-known align of polymer chains under shear, despite becoming significant for ionic liquids only at extremely high rates.

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