Thermal conductivity of ionic liquids under pressure

Thermal conductivity of the ionic liquid [HMIm][Tf2N] with compressed carbon dioxide

“…The increase of thermal conductivity as a function of pressure can also be attributed primarily to the increase in density at constant temperature, but also related to the speed of sound as predicted by the Bridgman correlation (Equation ). The trends presented herein are similar to those reported by Yebra et al 80 for several other ILs under pressure. From their data for the IL 1‐butyl‐3‐methylimidazolium methylsulfate ([BMIm][MeSO 4 ]) at 293.15 K and 20 MPa, they report an increase of ~3%.…”

“…A Heuristic Modification of the Enskog Theory (HMET) as described by Yebra et al 80 has also been utilized to correlate the trends in pure IL thermal conductivity (Figure 2). The variation of the HMET correlation utilized for the purpose of this study is shown in Equation (). where A and B are parameters fit to the data, ρ is the density in kg/m 3 (from Esperança et al 108 and Safarov et al 109 ), and T is temperature in absolute Kelvin.…”

“…Values for density were obtained from data reported by Esperança et al 108 and Safarov et al 109 Data for the speed of sound were obtained from data reported by Andresová et al 110 The isochoric heat capacity values used were interpolated from the data of Polikhronidi et al 111 The reported isochoric heat capacity data show a quadratic dependence on temperature with a general increase in isochoric heat capacity with temperature. A Heuristic Modification of the Enskog Theory (HMET) as described by Yebra et al 80 has also been utilized to correlate the trends in pure IL thermal conductivity (Figure 2). The variation of the HMET correlation utilized for the purpose of this study is shown in Equation (7).…”

“…Fröba et al 76 measured the thermal conductivity of a series of pure ILs over the temperature range of 273.15–333.15 K using a guarded parallel‐plate method that utilizes a single‐dimensional form of Fourier's Law of heat conduction. Ge et al 77 utilized a transient hot‐wire method to measure the thermal conductivity of 11 different ILs over a temperature range of 293–353 K. Further simulations and experiments on thermal and transport properties of pure ILs have been conducted by various groups 78–89 . Gardas and Coutinho 90 have utilized a group contribution model to predict the thermal conductivity of certain ILs as a function of temperature and two contribution fitting parameters.…”

Measurements of the Thermal Conductivity of l-Menthol–Decanoic Acid Deep Eutectic Solvents in the Temperature Range from 283.15 to 363.15 K at Pressures up to 15.1 MPa

“…is determined using eq where n is the total number of thermal conductivity data points and λ i ,cal and λ i ,exp are the calculated thermal conductivity value by the model and the corresponding experimental value, respectively. Moreover, from the coefficients obtained, it is easy to conclude that temperature and pressure dependences are quite similar to those of molecular compounds and ionic liquids . Men–DecA also shows stronger pressure dependencies than temperature dependencies.…”