The application of the theory and methodology presented in the previous chapters for formulating and solving the population balance equation (PBE), as well as its coupling with fluid flow and computational fluid dynamics (CFD), is here demonstrated via three case studies. The first case study is about synthesis of silica nanoparticles in a laminar flame. The second one involves soot formation in laminar and turbulent flames. The third one is about precipitation of barium sulphate crystals in a turbulent T-mixer flow. In each case, the deployment of the population balance methodology is presented in an educational manner, following the four main steps outlined in Chapter 1.