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i have simulate the flow of water in tundish in steady and isothermal case and i want to found rtd of my tracer with properties :35g/l,3e-8 m2/s2. i have use this procedure: 1-define species and i put my tracer and water and monitoring my concentration at the outlet. * i have problemes to put the materials properties of mixture .

*how to put the mass fraction in boundary condition.

*how to remove the equation of energy because appeares in mixture template.