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doi: 10.3850/978-981-08-7614-2_IMPRES071
Estimation of Effective Thermal Conductivity of Metal Hydride Packed Bed Considering Expansion/Contraction during Adsorption/Desorption Process
Yoshinori Hamamoto1, Keishi Kariyaa, Hideo Mori, Atsuroh Etoh and Tadafumi Mitani2
1Department of Mechanical Engineering, Faculty of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka-shi, Fukuoka 819-0395, Japan.
kariya@mech.kyushu-u.ac.jp
2Department of Mechanical Engineering Science, Graduated school of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka-shi, Fukuoka 819-0395, Japan
ABSTRACT
This study deals with developing a theoretical model of heat and mass transfer in a metal hydride packed bed. In order to clarify the heat and mass transfer of the bed, it is necessary to predict the effective thermal conductivity of the bed which depends on the void fraction and particle diameter. Void fraction and particle diameter of metal hydride (LaNi5) changes during adsorption/desorption process. In this study, expansion/contraction coefficient during adsorption/desorption process is measured to estimate the effective thermal conductivity. Results showed that the expansion coefficient is about 10 % during H2 adsorption process at any temperature conditions. It is also found that the effect of void fraction on the thermal conductivity is more influential than that of the particle diameter.
Keywords: Effective thermal conductivity, Metal hydride packed bed, Expansion/contraction, Adsorption/desorption.
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