A new model for effective segregation coefficient in microgravity is proposed. Natural convection is quantified using Nusselt numbers, so that solute film thickness δ does not need to be known.   A “Combined-Convection” Nusselt number, Nu_CC is derived for the solid-liquid interface,  which accounts for buoyancy-driven flow, and the cross-flow velocity f,  entering the interface. Nu_CC  is used to calculate the effective segregation coefficient, k_eff at low levels of natural convection,  occurring in space laboratories.  

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