Thermal conductivity of heavy, even-carbon number n-alkanes (C22 to C32)

Fleming, Felipe P.; Silva, Lívia de Andrade; Lima, Guilherme dos Santos Vieira; Herzog, Iasmin L.; Orlande, Helcio R. B.; Daridon, Jean-Luc; Pauly, Jérôme; Azevedo, Luis Fernando Alzuguir

doi:10.1016/j.fluid.2018.08.016

Cited by 28 publications

(6 citation statements)

References 45 publications

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“…Organics Liquids. Measurements of the thermal conductivity dependence on the number of carbon atoms n in alkenes seem to suggest that thermal conductivity increases with n almost linearly between 22 and 32 [124] but decreases with increasing temperature. Experimentally, the measured specific heat does not change much with n and saturates after n ¼ 10 [125] and usually increases with increasing temperature.…”

Section: Thermal Conductivity Of Selected Liquidsmentioning

confidence: 99%

“…They observed a shallow minimal of thermal conductivity when there are four carbons along the alcohol chain, consistent with experiments, although they cautioned that experiments might be wrong and suspected thermal conductivity of longer chains might be a constant. However, based on the experimental data on longer alkane chains [124], the thermal conductivity does increase with chain length, likely due to increased intrachain heat conduction.…”

Section: Thermal Conductivity Of Selected Liquidsmentioning

confidence: 99%

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Perspectives on Molecular-Level Understanding of Thermophysics of Liquids and Future Research Directions

Chen

2021

Journal of Heat Transfer

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This article provides the author's perspectives on the current molecular-level understanding of thermophysical properties and transport processes in liquids. After illustrating peculiarities of the thermophysical properties of some common liquids using experimental data on their specific heat, thermal conductivity and viscosity, the article moves on with a summary of existing molecular pictures and theoretical approaches on liquids, followed with elaborations on different models developed for the specific heat, thermal conductivity, and viscosity. The review shows that current understanding of thermophysical properties of liquids is still poor and theoretical tools to study them are not well developed. The article provides personal views of the author on what are missing in current theories and underlying mechanisms for some experimental observations, and includes some suggestions for potential directions of future research.

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Section: Thermal Conductivity Of Selected Liquidsmentioning

confidence: 99%

Section: Thermal Conductivity Of Selected Liquidsmentioning

confidence: 99%

Perspectives on Molecular-Level Understanding of Thermophysics of Liquids and Future Research Directions

Chen

2021

Journal of Heat Transfer

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“…In this section, 7595 thermal conductivity data for pure liquids available in the literature ,,− were used to acquire group contribution parameters and model parameters in eqs and , after which 2160 thermal conductivity data for 71 binary mixtures were gathered from the literature − and were used to determine model parameters for the four types of liquids in eq . The model parameters for each type of liquid work for all mixtures belonging to that type of liquid.…”

Section: Resultsmentioning

confidence: 99%

Prediction of Thermal Conductivity for Guiding Molecular Design of Liquids

Liu

Wang

Lan

et al. 2020

ACS Sustainable Chem. Eng.

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There is a need for molecular-structure-based predictive models that guide the molecular design of materials with desired properties. Herein, we developed a general model based on group-contribution (GC) theory and vibrational theory that predicts the thermal conductivity of different types of liquids which are used as working media in energy conversion and environmental protection, including three types of organic molecular liquids, ionic liquids, and their mixtures. We also derive the pressure dependencies of the thermal conductivities of these liquids for the first time. The GC model is extended to determining the thermal conductivities of mixtures by developing a group division method and mixing rules that operate without knowing the thermal conductivity of each component. The excellent performance of the presented model is verified by comparing the predicted thermal conductivities with experimental data and those from other models. On the basis of the developed model, group sequences are established according to their contributions to thermal conductivity, and the sensitivity of thermal conductivity to temperature and pressure is analyzed to guide the molecular design of liquids.

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“…Thermal conductivity data for n-docosane from the literature are listed in [13,18,19]. On the other hand, the publications by Abhat, Sari et al, Li et al (2013) and Li et al (2014) do not indicate the temperature where the thermal conductivity was measured [14,[20][21][22].…”

Section: Thermal Conductivity Of Paraffinsmentioning

confidence: 99%

Thermal conductivity of solid paraffins and several n-docosane compounds with graphite

Paul

Baumhögger

Dewerth

et al. 2023

J Therm Anal Calorim

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The technical importance of paraffins as phase change materials (PCM) in heat storage systems increases. Knowledge on the thermal conductivity of paraffins is necessary for the design and optimization of heat storage systems. However, for most paraffins solely the thermal conductivity of the liquid state has been sufficiently investigated. For the solid state, precise thermal conductivity data are only known for a few paraffins, while only generalized values are available for the remainder, some of which contradict each other. In this study, a measurement setup based on the modified guarded hot plate method is developed. It is used to investigate the thermal conductivity of several paraffines in the solid state, including pure n-docosane and its compounds with different types and concentrations of graphite. For n-docosane in the solid state, the thermal conductivity is determined to be 0.49 W m−1 K−1. A particle size of 200 μm with a spherical shape turns out to be optimal to increase the thermal conductivity. This allows the thermal conductivity of a compound with 10% graphite to increase by a factor of three compared to the pure paraffin. Furthermore, significant differences to thermal conductivity data from the literature are found.

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Thermal conductivity of heavy, even-carbon number n-alkanes (C22 to C32)

Cited by 28 publications

References 45 publications

Perspectives on Molecular-Level Understanding of Thermophysics of Liquids and Future Research Directions

Perspectives on Molecular-Level Understanding of Thermophysics of Liquids and Future Research Directions

Prediction of Thermal Conductivity for Guiding Molecular Design of Liquids

Thermal conductivity of solid paraffins and several n-docosane compounds with graphite

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