In this theme the work balance leans more towards experiments, but computations are also performed. This theme has an emphasis on mixing and reacting jets, phase and thermodynamic state changes, mixing dynamics (e.g. spray-induced turbulence), chemical reaction, and the effect of these process on performance of technological devices. A very large experimental effort is devoted to the use, adaptation, and development of entirely new laser diagnostic techniques for sprays and chemically reacting flows. The theme leader is Professor Mark Linne.