Isentropic Compressibility, Electrical Conductivity, Shear Relaxation Time, Surface Tension, and Raman Spectra of Aqueous Zinc Nitrate Solutions

2004 ◽  
Vol 49 (1) ◽  
pp. 126-132 ◽  
Author(s):  
Abdul Wahab ◽  
Sekh Mahiuddin
Keyword(s):  
Electrical Conductivity ◽  
Surface Tension ◽  
Relaxation Time ◽  
Raman Spectra ◽  
Isentropic Compressibility ◽  
Zinc Nitrate ◽  
Shear Relaxation ◽  
Shear Relaxation Time ◽  
Nitrate Solutions

Viscosity, electrical conductivity, shear relaxation time and Raman spectra of aqueous and methanolic sodium thiocyanate solutions

2001 ◽  
Vol 178 (1-2) ◽  
pp. 277-297 ◽  
Author(s):  
Nashiour Rohman ◽  
Abdul Wahab ◽  
Narendra N. Dass ◽  
Sekh Mahiuddin
Keyword(s):  
Electrical Conductivity ◽  
Relaxation Time ◽  
Raman Spectra ◽  
Sodium Thiocyanate ◽  
Shear Relaxation ◽  
Shear Relaxation Time

Electrical conductivity, speeds of sound, and viscosity of aqueous ammonium nitrate solutions

2001 ◽  
Vol 79 (8) ◽  
pp. 1207-1212 ◽  
Author(s):  
Abdul Wahab ◽  
Sekh Mahiuddin
Keyword(s):  
Electrical Conductivity ◽  
Ammonium Nitrate ◽  
Structural Information ◽  
Ion Pairs ◽  
Nitrate Solution ◽  
Hydration Number ◽  
Isentropic Compressibility ◽  
Speeds Of Sound ◽  
Ammonium Nitrate Solution ◽  
Nitrate Solutions

Density, electrical conductivity, speeds of sound, and viscosity of aqueous ammonium nitrate solutions were measured as functions of concentration (m, mol kg–1) (0.1599 [Formula: see text] m [Formula: see text] 20.42) and temperature (T, K) (273.15 [Formula: see text] T [Formula: see text] 323.15). Experimental values are consistent with the reported data. Variation of isotherms of electrical conductivity, isentropic compressibility, and structural relaxation time with concentration evoke structural information on the ion solvation in aqueous ammonium nitrate solution at different concentration regions. The primary hydration numbers of ammonium nitrate were estimated at a particular concentration at which the isentropic compressibility isotherms converge. The existence of free hydrated ions, resulting from strong ion solvent interactions in dilute to 9.1 mol kg–1, the solvent-separated ion-pairs resulting from the relative competition between the ion–solvent and the ion–ion interactions in 9.1 to 12.0 mol kg–1, and the solvent-shared ion-pairs beyond 12.0 mol kg–1 resulting from a decrease in the number of solvent molecules, govern the transport process.Key words: electrical conductivity, speeds of sound, viscosity, ammonium nitrate, hydration number.

scholarly journals Extracting the Shear Relaxation Time of Quark--Gluon Plasma from Rapidity Correlations

2019 ◽  
Vol 50 (6) ◽  
pp. 1139
Author(s):  
G. Moschelli ◽  
S. Gavin
Keyword(s):  
Relaxation Time ◽  
Quark Gluon Plasma ◽  
Gluon Plasma ◽  
Shear Relaxation ◽  
Shear Relaxation Time

Investigation of the density dependence of the shear relaxation time of dense fluids

2005 ◽  
Vol 83 (3) ◽  
pp. 236-243 ◽  
Author(s):  
Mehrdad Bamdad ◽  
Saman Alavi ◽  
Bijan Najafi ◽  
Ezat Keshavarzi
Keyword(s):  
Relaxation Time ◽  
Shear Modulus ◽  
Density Dependence ◽  
Radial Distribution ◽  
Shear Viscosity ◽  
Viscosity Coefficient ◽  
Dense Fluids ◽  
Lennard Jones ◽  
Shear Relaxation ◽  
Shear Relaxation Time

The shear relaxation time, a key quantity in the theory of viscosity, is calculated for the Lennard–Jones fluid and fluid krypton. The shear relaxation time is initially calculated by the Zwanzig–Mountain method, which defines this quantity as the ratio of the shear viscosity coefficient to the infinite shear modulus. The shear modulus is calculated from highly accurate radial distribution functions obtained from molecular dynamics simulations of the Lennard–Jones potential and a realistic potential for krypton. This calculation shows that the density dependence of the shear relaxation time isotherms of the Lennard–Jones fluid and Kr pass through a minimum. The minimum in the shear relaxation times is also obtained from calculations using the different approach originally proposed by van der Gulik. In this approach, the relaxation time is determined as the ratio of shear viscosity coefficient to the thermal pressure. The density of the minimum of the shear relaxation time is about twice the critical density and is equal to the common density, which was previously reported for supercritical gases where the viscosity of the gas becomes independent of temperature. It is shown that this common point occurs in both gas and liquid phases. At densities lower than this common density, even in the liquid state, the viscosity increases with increasing temperature.Key words: dense fluids, radial distribution function, shear modulus, shear relaxation time, shear viscosity.

scholarly journals MICROSCOPIC ORIGIN OF THE SHEAR RELAXATION TIME IN CAUSAL DISSIPATIVE FLUID DYNAMICS

2012 ◽  
Author(s):  
GABRIEL S. DENICOL ◽  
HARRI NIEMI ◽  
JORGE NORONHA ◽  
DIRK H. RISCHKE
Keyword(s):  
Fluid Dynamics ◽  
Relaxation Time ◽  
Dissipative Fluid ◽  
Shear Relaxation ◽  
Shear Relaxation Time ◽  
Microscopic Origin
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