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The effective thermal conductivity of metal hydride (MH) is greatly influenced by the void fraction of packed bed. So, we investigated metal hydride packed-bed change caused by repetition of hydrogen absorption and discharge. This paper includes two experiments; one is the measurement of the particle breakup, and the other is the direct visualization of volume change of metal hydride bed. The particle breakup makes the diameter of particle become uniform gradually, decreases the degree of circularity and increases the surface roughness. The volume change of metal hydride bed was clearly shown by the visualization experiment. The results shows that it became impossible to pack metal hydride densely under the influence of the foregoing particle change and that the total volume increased. When the particle breakup and the increase in the volume almost stopped, the cycles of expansion and contraction were repeated at the void fraction beyond 60%.

A Study of State Change in Metal Hydride Packed-Bed Caused by Particle Breakup