temperature diffusivity
1.Especially a lot of effective identifications are performed for the ice layer of higher temperature, thermal diffusivity of the natural ice between -0.19 and -2.12°C is obtained, which shows that when the ice temperature lowers than -0.76°C, the relationship between thermal diffusivity of river ice and temperature corresponds with the previous;
2.An experimental equipment is designed for measuring simultaneously theeffective diffusivity of gases through multipellets of Ag-catalyst in a system ofN_2-H_2 under normal pressure and temperature. Tortuosity of two catalyst carri-ers are 4.08 and 2.24.
3.The apparent diffusivity of hydrogen de-pends on the austenite content (fγ) at room temperature, D=(0.27+0.9/f_γ~2) (10~(-10)cm~2/s). It is simply verified that hydrogen in (α+γ) duplex stainless steel diffusesin "series-connection" form through both ferrite and austenite, the apparent diffu-sivity is D≈D_αD_γ/(f_α~2D_γ+f_γ~2D_α), where D_αD_γare respectively diffusivity of hydrogenin ferrite and austenite, f_α,f_γare volume fraction, in turn, of ferrite and aus-tenite.
