Thermal conductivity of Ionic Liquids: An estimation approach

Albert, Johannes; Müller, Karsten

doi:10.1016/j.ces.2014.08.023

Cited by 29 publications

(12 citation statements)

References 21 publications

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“…For tungsten carbide, the product K s qc = 3.3 9 10 8 J 2 K -2 s -1 m -4 , b was 69 lm at a load of 22.7 N and 92 lm at 53.7 N. For most lubricants, K oil was estimated from data in [34] by selecting the nearest fluid type and correcting to the relevant mean contact pressures as suggested in this paper. Atmospheric pressure values for PFPEs were taken from [35] and ionic liquids from [36] and adjusted by assuming a similar conductivity-pressure dependence to other fluid types. In general, this adjustment gives thermal conductivity about 2.5 times larger at 2 GPa than at atmospheric pressure.…”

Section: Temperature Effectmentioning

confidence: 99%

Effect of Base Oil Structure on Elastohydrodynamic Friction

2016

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The EHD friction properties of a wide range of base fluids have been measured and compared in mixed sliding-rolling conditions at three temperatures and two pressures. The use of tungsten carbide ball and disc specimens enabled high mean contact pressures of 1.5 and 2.0 GPa to be obtained, comparable to those present in many rolling bearings. The measurements confirm the importance of molecular structure of the base fluid in determining EHD friction. Liquids having linear-shaped molecules with flexible bonds give considerably lower friction than liquids based on molecules with bulky side groups or rings. EHD friction also increases with viscosity for liquids having similar molecular structures. Using pure ester fluids, it is shown that quite small differences in molecular structure can have considerable effects on EHD friction. The importance of temperature rise in reducing EHD friction at slide-roll ratios above about 5% has been shown. By measuring EHD friction at several temperatures and pressures as well as EHD film thickness, approximate corrections to measured EHD friction data have been made to obtain isothermal shear stress and thus EHD friction curves. These show that under the conditions tested most low molecular weight base fluids do not reach a limiting friction coefficient and thus shear stress. However, two high traction base fluids appear to reach limiting values, while three linear polymeric base fluids may also do so. Constants of best fit to a linear/logarithmic isothermal shear stress/strain rate relationship have been provided to enable reconstruction of isothermal EHD friction behaviour for most of the fluids tested.

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Section: Temperature Effectmentioning

confidence: 99%

Effect of Base Oil Structure on Elastohydrodynamic Friction

2016

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“…The thermal conductivities of [BMIM][L-trp] are between 0.180 and 0.177 W m -1 K -1 from 283.15 K to 343.15 K, similar with those of ammonium-and phosphonium-based amino acid ionic liquids reported by Gardas et al 26 The thermal conductivities decrease linearly with the increase of temperature, which is in agreement with the tendency of most ionic liquids from published references. 39,40 So we correlate the thermal conductivity of [BMIM][L-trp] as a linear function of temperature here.…”

Section: Pure Componentsmentioning

confidence: 99%

Measurement of the Thermal Conductivity of 1-Butyl-3-methylimidazolium l-Tryptophan + Water + Ethanol Mixtures at T = (283.15 to 333.15) K

Chen

Zhu

et al. 2019

J. Chem. Eng. Data

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Thermal conductivities of 1-butyl-3-methylimidazolium L-tryptophan ([BMIM][L-trp]), water, ethanol, [BMIM][L-trp] + water, [BMIM][L-trp] + ethanol, water + ethanol and [BMIM][L-trp] + water + ethanol were investigated from 283.15 K to 333.15 K covering the whole scale of concentrations at atmospheric pressure with transient hot wire method. The thermal conductivities of pure [BMIM][L-trp] decease linearly from 0.180 to 0.177 W m -1 K -1 with increasing temperature. The uncertainty of the measurement was less than 2% at 0.95 confident level. The experimental data of binary and ternary mixtures were correlated by second-order Scheff́ polynomial as a function of composition and temperature. The average relative deviation of the calculated values with experiment data was 0.58%.

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“…The experimental data of this property is available for only a limited number of ionic liquids. Various authors have proposed correlations and predictive models for estimation of thermal conductivity (Albert and Muller, 2014;Carrete et al, 2012;Chen et al, 2014;Hezave et al, 2012;Hosseini et al, 2016;Lazzús, 2015aLazzús, , 2015bLazzús and Pulgar-Villarroel, 2015;Shojaee et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…In this context, Albert and Muller (2014) have developed a Quantitative Structure-Property Relationship (QSPR) model for the determination of the thermal conductivity. It uses the experimental data of 39 pure ionic liquids, covering a temperature range of 273.15 K to 390 K. The QSPR model is based on the information of ions constituting it as the only input parameter.…”

Section: Introductionmentioning

confidence: 99%

Thermal Conductivity Enhancement of Aqueous Ionic Liquid and Nanoparticle Suspension

Soman

Kalaichelvi

Radhakrishnan

2019

Braz. J. Chem. Eng.

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In the present study, the thermal conductivities of ionic liquid + water in the concentrations 0.1-0.6 %w/w and temperatures (302.5-337.9 K) are determined. The thermal conductivity of aqueous 1-butyl-3-methylimidazolium bromide declined with increasing concentration and temperature. A quadratic model is developed for predicting the thermal conductivity of aqueous ionic liquid using response surface methodology with R 2 = 0.99. A two-layered feed forward back propagation neural network 2-10-1 is also modeled with mean square error, root means square and absolute average error percentage of 0.005, 0.071 and 2.684, respectively. The thermal conductivity of nanofluid (γ-Al 2 O 3 /water) is estimated and compared with the ionic liquid solution at the same concentration and temperature range. Thermal conductivity enhancement ratios of aqueous ionic liquids are found to be more than nanoparticle suspensions.

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Thermal conductivity of Ionic Liquids: An estimation approach

Cited by 29 publications

References 21 publications

Effect of Base Oil Structure on Elastohydrodynamic Friction

Effect of Base Oil Structure on Elastohydrodynamic Friction

Measurement of the Thermal Conductivity of 1-Butyl-3-methylimidazolium l-Tryptophan + Water + Ethanol Mixtures at T = (283.15 to 333.15) K

Thermal Conductivity Enhancement of Aqueous Ionic Liquid and Nanoparticle Suspension

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