Situation 3:No diffusion in the solid,Limited 先进材料疑固实验室diffusion in the liquid,no convection. Laboratory of Advanced Materials Solidification At initial transient state,we assume the concentration variation rate of solid is linearly related to solid concentration: d(Cs-Co) dx' =-a(C-Cg) a-is the parameter for the linear relationship then Co-Cs Ae-ax Boundary condition:Cs=kCo at x'=0 ©It is obtained that: Cs=C[1-(1-ko)e-x2] 上浒充通大学 SHANGHAI JIAO TONG UNIVERSITYAt initial transient state, we assume the concentration variation rate of solid is linearly related to solid concentration: then Boundary condition: Cs=kC0 at x’=0 It is obtained that: Situation 3: No diffusion in the solid, Limited diffusion in the liquid, no convection. α- is the parameter for the linear relationship