This paper corrects an error in the work of Nere and Ramkrishna [Ind. Eng. Chem. Res. 2005, 44, 1187] on solving population balance equations for the evolution of drop-size distributions in fully developed turbulent flow of a liquid- liquid dispersion in a circular pipe. We rely on the previously noted Nere and Ramkrishna's work for the formulation of the problem. An alternative linear operator formulation is developed here to solve the population balance equation, compared with detailed numerical solution obtained by computational fluid dynamics (CFD) and is determined to be considerably more efficient.