Experimental Study and Correlation Models of the Density and Viscosity of 2-Methoxy-2-methylpropane with n-propanol

Abstract

Densities (r) and viscosities (h) of the binary systems 2-Methoxy-2-methylpropane with n-propanol were measured at temperatures 288.15, 293.15, 298.15, 303.15 and 308.15 K and atmospheric pressure, over the whole composition range. Belda, Herraez, Emmerling et al. and Gonzalez-Olmos-Iglesias models were used to correlate the densities of binary mixtures. The Mchaweh-Nasrifar-Mashfeghian, Hankinson-Thomson, Yamada-Gunn and Reid et al. models were used to estimate the liquid density of the binary mixtures. Viscosity results were fitted to the equations of Grunberg-Nissan, Heric-Brewer, Jouyban-Acree and McAllister. The thermodynamic activation parameters, free energy, DG�, enthalpy, DH� and entropy, DS� for viscous flow have been estimated and their variations with compositions have been discussed.

Physicochemical Properties of LiFSI Solutions II: LiFSI with Water, MTBE, and Anisole

“…The obtained sample was analyzed in a nuclear magnetic resonance (NMR) spectrometer (Bruker Avance 3 HD 400 MHz NMR equipped with a cryogenic probe). The acquired 1 H, 13 C, and 19 F NMR spectra confirmed that the crystalline solid phase was pure LiFSI (x MTBE < 1 × 10 −5 mol mol −1 , estimated from the limit of detection).…”

“…Literature comparisons of the experimental density data of pure MTBE from this work to data from the literature and of the experimental shear viscosity data of pure MTBE from this work to data from the literature; 1 H NMR spectra, 13 Standard uncertainties u are u r (w LiFSI ) = 0.025, u(w H 2 O ) = 0.0006 g g −1 , u(T) = 0.1 K, and u(p) = 3 kPa.…”

“…The dependence of the shear viscosity η of solutions of LiFSI in MTBE on the composition and the temperature is described by eq where c LiFSI is the molarity of LiFSI and A i represents empirical temperature-dependent functions with i = (0, 1, 2). a i , b i , and c i are adjustable parameters.…”

Theoretical Analysis of a Hydraulic Drive System. The Influence of the Work Environment on the Performance of the System

“…Instead, depending on the system load, the pressure may vary within wide limits. Under these conditions, according to the relationship (15) the density will be given by the relationship: Figure 4 graphically shows the functions ρt(t) and ρp(P) defined by relationships (14), (15) and (16). According to Newton's law, the tangential forces that take between two adjacent fluid layers dz which travel at a relative speed dwx are proportional to the gradient of the speed of the layers and the contact surface: (17) Where: dA represents the elementary surface of the contact layer, dwx/dz speed gradient, and η the coefficient of proportionality, called also dynamic viscosity.…”

“…The study of real fluid flow is generally difficult to address by complete theoretical methods, due to the special complications caused by a number of disturbing factors such as fluid friction (viscosity), turbulence, driving solid particles, presence of internal heat sources etc. The knowledge of fundamental properties behavior in a system can help us understand the nature of molecular interactions and so we can determine other thermodynamic properties [4], [5], [16], [17]. Temperature and density are factors that affect the treated metals, which have an important influence on the macroscopic mechanical properties and the stability of materials [6], [7].…”