Author(s): , , ,

Keywords: , , , , , , , , , , , , , , ,

Abstract: The thermal conductivities of gas hydrates are well documented, but the thermal conductivities of structure H (sH) methane-methylcyclohexane (MCH) hydrate and type A tetrabutylammonium bromide (TBAB) semi clathrate hydrate have no experimental data. The purpose of this study was to determine the thermal conductivities of sH MCH hydrate and TBAB semi clathrate hydrate. The thermal conductivity was measured using a single sided transient plane source (TPS) method. Most gas hydrates increase in thermal conductivity when temperature is increased, but TBAB decreases with temperature. This could be caused by two things TBAB has a semi clathrate structure which is different from normal gas hydrates, or semi clathrate structure limits phonon free path, and increasing temperature decreases the free path further. The thermal conductivity of sH hydrated showed a glass like dependence on temperature (increasing temperature, increases thermal conductivity). The thermal conductivity of sH hydrate did not correlate with the values that were expected.

Reference: Journal of Thermal Analysis and Calorimetry (2015) 1-7

DOI: 10.1007/s10973-015-5065-3