If density and diffusion coefficient are assumed constant, then governing equation for mass transfer of A dissolved in solid B is
A. $$\frac{{\partial {C_A}}}{{\partial t}} = {D_{AB}}.\Delta {C_A}$$
B. $$\frac{{\partial {C_A}}}{{\partial t}} = {D_{AB}}.{\Delta _2}{C_A}$$
C. $$\frac{{\partial {C_A}}}{{\partial x}} = {D_{AB}}.{\Delta _2}{C_A}$$
D. $$\frac{{\partial {C_A}}}{{\partial x}} = {D_{AB}}.{\Delta }{C_A}$$
Answer: Option B
This Question Belongs to Metallurgical Engineering >> Miscellaneous In Metallurgy
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