Isobaric heat capacity at high pressure, density, and viscosity of (diphenyl ether + biphenyl) mixtures

Cabaleiro, David; Segovia, José J.; Martín, M. Carmen; Lugo, Luis

doi:10.1016/j.jct.2015.09.028

Cited by 11 publications

(3 citation statements)

References 67 publications

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“…5b. The base fluid and studied nanofluids exhibit small values of Angell Strength parameter, which indicates that the fluids present a rapid breakdown of their configurational structure with increasing temperature near and above the glass transition [64, 65]. Figure 6 shows the influence of GOnP concentration on viscosity ratio, i.e., η nf / η bf , at several temperatures.…”

Section: Resultsmentioning

confidence: 99%

Heat Transfer Capability of (Ethylene Glycol + Water)-Based Nanofluids Containing Graphene Nanoplatelets: Design and Thermophysical Profile

et al. 2017

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This research aims at studying the stability and thermophysical properties of nanofluids designed as dispersions of sulfonic acid-functionalized graphene nanoplatelets in an (ethylene glycol + water) mixture at (10:90)% mass ratio. Nanofluid preparation conditions were defined through a stability analysis based on zeta potential and dynamic light scattering (DLS) measurements. Thermal conductivity, dynamic viscosity, and density were experimentally measured in the temperature range from 283.15 to 343.15 K and nanoparticle mass concentrations of up to 0.50% by using a transient plate source, a rotational rheometer, and a vibrating-tube technique, respectively. Thermal conductivity enhancements reach up to 5% without a clear effect of temperature while rheological tests evidence a Newtonian behavior of the studied nanofluids. Different equations such as the Nan, Vogel-Fulcher-Tamman (VFT), or Maron-Pierce (MP) models were utilized to describe the temperature or nanoparticle concentration dependences of thermal conductivity and viscosity. Finally, different figures of merit based on the experimental values of thermophysical properties were also used to compare the heat transfer capability and pumping power between nanofluids and base fluid.

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Section: Resultsmentioning

confidence: 99%

Heat Transfer Capability of (Ethylene Glycol + Water)-Based Nanofluids Containing Graphene Nanoplatelets: Design and Thermophysical Profile

et al. 2017

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“…From the data gathered in Table 3, the effects of temperature, nature and concentration of the surfactant, as well as FLG mass concentration on the isobaric thermal expansivity, αp, [38,54,59] is evaluated according to the following equation, Equation (3): Figure 4 shows that increases when the temperature rises. In the case of Tyfocor ® LS alone, this increase is about 11% across the 293.15-308.15 K temperature interval.…”

Section: Isobaric Thermal Expansivitymentioning

confidence: 99%

Volumetric Properties and Surface Tension of Few-Layer Graphene Nanofluids Based on a Commercial Heat Transfer Fluid

et al. 2020

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Volumetric properties such as density and isobaric thermal expansivity, and surface tension are of paramount importance for nanofluids to evaluate their ability to be used as efficient heat transfer fluids. In this work, the nanofluids are prepared by dispersing few-layer graphene in a commercial heat transfer fluid Tyfocor® LS (40:60 wt.% propylene-glycol/water) with the aid of three different nonionic surfactants: Triton X-100, Pluronic® P-123 and Gum Arabic. The density, isobaric thermal expansivity and surface tension of each of the base fluids and nanofluids are evaluated between 283.15 and 323.15 K. The influence of the mass content in few-layer graphene from 0.05 to 0.5% on these nanofluid properties was studied. The density behavior of the different proposed nanofluids is slightly affected by the presence of graphene, and its evolution is well predicted by the weight-average equation depending on the density of each component of the nanofluids. For all the analyzed samples, the isobaric thermal expansivity increases with temperature which can be explained by a weaker degree of cohesion within the fluids. The surface tension evolution of the graphene-based nanofluids is found to be sensitive to the used surfactant, its content and the few-layer graphene concentration.

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“…The later solvent is used mainly as a heat transfer fluid and is sold commercially by Dow Chemical (Dowtherm A) and Eastman Chemical company (Therminol VP-1) . While considerable low-pressure thermophysical data for this eutectic mixture can easily be accessed, relatively little high-pressure or solubility data is available in the literature. − …”

Section: Introductionmentioning

confidence: 99%

Densities for Sulfur in Benzene and Densities with Solubilities for a Eutectic Mixture of Biphenyl plus Diphenyl Ether: A General Solubility Equation for the Treatment of Aromatic Physical Sulfur Solvents

et al. 2022

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Physical sulfur solvents are utilized in (i) the mitigation of sulfur deposition in sour gas wells and gathering lines and (ii) as a process medium for small-scale sulfur recovery. Non-aqueous aromatic solvents have two distinct advantages, where they are less reactive with elemental sulfur and provide for relatively large sulfur solubilities. Understanding the solubilities and physical properties within aromatic sulfur solvents over a wide range of temperature and pressure is important for both the previous applications. In this study, high-pressure densities for sulfur in benzene and a eutectic mixture of biphenyl and diphenyl ether were measured for T = (298.15−373.15) K and p < 100 MPa, where the densities were used to calculate the molar volume change upon dissolution. New sulfur solubility measurements are reported for sulfur in the eutectic mixture of biphenyl and diphenyl from T = (298.15−403.15) K and compared to benzene, toluene, and xylenes (BTX). The calculated volumetric changes and measured solubilities at atmospheric pressure were used to determine the enthalpy of dissolution, Δ X→sl H°, and the change in heat capacity, Δ X→sl C p °, for the α-sulfur, β-sulfur, and the liquid-sulfur phase dissolution using a van't Hoff model. The eutectic solvent showed a higher solubility when compared to BTX at higher temperatures (β-sulfur and the liquid-sulfur regions) and both solubilities calculated to have a very small pressure dependence.

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Isobaric heat capacity at high pressure, density, and viscosity of (diphenyl ether + biphenyl) mixtures

Cited by 11 publications

References 67 publications

Heat Transfer Capability of (Ethylene Glycol + Water)-Based Nanofluids Containing Graphene Nanoplatelets: Design and Thermophysical Profile

Heat Transfer Capability of (Ethylene Glycol + Water)-Based Nanofluids Containing Graphene Nanoplatelets: Design and Thermophysical Profile

Volumetric Properties and Surface Tension of Few-Layer Graphene Nanofluids Based on a Commercial Heat Transfer Fluid

Densities for Sulfur in Benzene and Densities with Solubilities for a Eutectic Mixture of Biphenyl plus Diphenyl Ether: A General Solubility Equation for the Treatment of Aromatic Physical Sulfur Solvents

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