TY - JOUR
T1 - Thermal conductivity measurements of semiclathrate hydrates and aqueous solutions of tetrabutylammonium bromide (TBAB) and tetrabutylammonium chloride (TBAC) by the transient hot-wire using parylene-coated probe
AU - Fujiura, Kyosuke
AU - Nakamoto, Yu
AU - Taguchi, Yoshihiro
AU - Ohmura, Ryo
AU - Nagasaka, Yuji
N1 - Funding Information:
The work described in this paper was carried out under a Grant-in-Aid for Scientific Research (S) (No. 24226006) from the Japan Society for the Promotion of Science (JSPS). The parylene-coated probe was fabricated in “Global nano micro technology business incubation center (NANOBIC), Kawasaki city, Japan” supported by the academic consortium for nano and micro fabrication of four universities (Keio university, Waseda university, Tokyo institute of technology, and the University of Tokyo).
Publisher Copyright:
© 2015 The Authors.
PY - 2016/4/15
Y1 - 2016/4/15
N2 - The thermal conductivity of semiclathrate hydrates and aqueous solutions of tetrabutylammonium bromide (TBAB) and tetrabutylammonium chloride (TBAC) was measured for the first time in the temperature range from 223 to 303 K under atmospheric pressure. A transient hot-wire apparatus using a parylene-coated probe was employed for the measurements with an uncertainty of ±0.7%. The experimental results indicate that the thermal conductivity of two semiclathrate hydrates are smaller than those of two clathrate hydrates-about 80% of the THF hydrate and 60% of the CH4 hydrate-and are about a factor of 5.5 lower than that of ice Ih at temperatures near the melting point. In addition, the temperature coefficient of the thermal conductivity of semiclathrate hydrate show a weak negative, and the thermal conductivity is more sensitive to the molar mass of a guest molecule.
AB - The thermal conductivity of semiclathrate hydrates and aqueous solutions of tetrabutylammonium bromide (TBAB) and tetrabutylammonium chloride (TBAC) was measured for the first time in the temperature range from 223 to 303 K under atmospheric pressure. A transient hot-wire apparatus using a parylene-coated probe was employed for the measurements with an uncertainty of ±0.7%. The experimental results indicate that the thermal conductivity of two semiclathrate hydrates are smaller than those of two clathrate hydrates-about 80% of the THF hydrate and 60% of the CH4 hydrate-and are about a factor of 5.5 lower than that of ice Ih at temperatures near the melting point. In addition, the temperature coefficient of the thermal conductivity of semiclathrate hydrate show a weak negative, and the thermal conductivity is more sensitive to the molar mass of a guest molecule.
KW - Semiclathrate hydrates
KW - Tetrabutylammonium bromide (TBAB)
KW - Tetrabutylammonium chloride (TBAC)
KW - Thermal conductivity
KW - Transient hot-wire
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U2 - 10.1016/j.fluid.2015.09.024
DO - 10.1016/j.fluid.2015.09.024
M3 - Article
AN - SCOPUS:84957839406
SN - 0378-3812
VL - 413
SP - 129
EP - 136
JO - Fluid Phase Equilibria
JF - Fluid Phase Equilibria
ER -