Numerical simulation of diffusivity of hydrogen in thin tubular metallic membranes affected by self-stresses
Numerical simulation of diffusivity of hydrogen in thin tubular metallic membranes affected by self-stresses
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DOI：
10.1016/j.ijhydene.2003.10.007
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发表时间：
2003-12
影响因子：
7.2
通讯作者：
W. Zhang;M. Hou;Heyi Wang;Yi-Bei Fu
中科院分区：
文献类型：
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作者：
W. Zhang;M. Hou;Heyi Wang;Yi-Bei Fu
基于氢在薄管壳中的自应力理论，数值计算了化学势和通量阶跃边界条件下氢在膜中的表观扩散系数（ADC）.当初始浓度或化学势阶跃（或通量阶跃）取非零值时，ADC不同于无应力条件下的扩散系数。同时，还讨论了其它参数对ADC值的影响。理论结果与实验数据定性一致。我们的结果表明，当初始氢含量不为零时，小电流将使扩散系数的确定误差最小。
Based on the self-stress theory for hydrogen in thin tubular shells, we numerically calculate apparent diffusion coefficients (ADCs) of hydrogen in membranes obtained from the time-lag and half-rise methods under chemopotential- and flux-step boundary conditions. It is found that ADCs differ from the diffusion coefficient under stress-free conditions when either the initial concentration or the chemopotential-step (or flux-step) is taken to be a nonzero value. At the same time, effects of other parameters on values of ADC are discussed as well. The theoretical results are qualitatively consistent with the available experimental data. Our results indicate that a small current will give the minimum error in determining the diffusion coefficient while the initial hydrogen content is nonzero.