In combustion, Emmons problem describes the flame structure which develops inside the boundary layer, created by a flowing oxidizer stream on flat fuel (solid or liquid) surfaces. The problem was first studied by Howard Wilson Emmons in 1956.Emmons, H. W. (1956). The film combustion of liquid fuel. ZAMM‐Journal of Applied Mathematics and Mechanics/Zeitschrift für Angewandte Mathematik und Mechanik, 36(1‐2), 60-71.Clarke, J. F. (1969). Emmons' problem according to the Oseen approximation. The Physics of Fluids, 12(1), 241-243.Baum, H. R., & Atreya, A. (2015). The Elliptic Emmons Problem. In ICHMT DIGITAL LIBRARY ONLINE. Begel House Inc.. The flame is of diffusion flame type because it separates fuel and oxygen by a flame sheet. The corresponding problem in a quiescent oxidizer environment is known as Clarke–Riley diffusion flame.
