[en] Highlights: • Thermal conductivity of n-dodecane and n-tetradecane was investigated. • Measurements cover a wide temperature and pressure region. • One polynomial were presented to calculate the thermal conductivity. • The comparison between literature data and the present data was carried out. With the key role of long-chain hydrocarbons in the wide applications in numerous industrial areas, such as working fluids, phase change materials, fuels, etc., the knowledge of the thermal conductivity of hydrocarbons is essential in the energy conversion process. Thus, it is of great significance to get reliable experimental data of hydrocarbons’ thermal conductivity for further accurately theoretical predictions and the potential applications. In this work, the thermal conductivities of two long-chain hydrocarbons of n-dodecane and n-tetradecane, are investigated experimentally. The transient hot-wire method was used for the measurement of the thermal conductivity under the conditions of 293–523 K and 0.1–15.0 MPa. By comparing the present work with literature results, the possible reasons for the deviations were analyzed. The results in this study provide accurately measured of the thermal conductivity of the two long-chain hydrocarbons at high temperature and pressure, which are expected to fill the gap in literature.

[en] Highlights: • Thermal conductivity of MeC4:0 and MeC6:0 was investigated. • Measurements cover a wide temperature and pressure region. • One polynomial were presented to calculate the thermal conductivity. • Predictive ability of three models is assessed using our data. Fatty acid methyl esters (FAMEs) are the main component of biodiesels. Before the industrial application of FAMEs, it is essential to investigate the thermophysical properties of FAMEs. Thermal conductivity of fuels is used in various processes, such as the design of the heat transfer system and the determination of the temperature distribution of engines. Thus, it is of great significance to acquire accurate experimental data and develop reliable models for obtaining accurate thermal conductivity data of FAMEs. In this work, thermal conductivities of two short-chain FAMEs, methyl butyrate (MeC4:0) and methyl caproate (MeC6:0) were studied experimentally and theoretically. The thermal conductivities of these two FAMEs were measured by the transient hot-wire method at T = 303 to 523 K and p = 0.1 MPa to 15 MPa, the data were correlated as a polynomial function of temperature and pressure, the AADs are 0.38% for MeC4:0 and 0.42% for MeC6:0, respectively. Moreover, the experimental thermal conductivities agree well with the available data from literature. In addition, three classical models (Latini model, Sastri model, Liu model) were used to represent the present experimental data and the results show that Liu model with re-fitted parameters performs better in the prediction of the thermal conductivity of FAMEs, with regard to accuracy.