Mixing Across a Gas-Gas Interface

摘要

An investigation of interfacial turbulence at gas-gas interfaces is reported. All interfaces cannot be treated in the same theoretical or experimental frame-work since, the mathematics governing the motion of the different phases is different and the physical properties of gas and liquid phases are different, necessitating different experimental techniques. In this case also, with a gas-gas interface in turbulence motion we have free turbulence, as it is not being influenced by a solid boundary. Here, the rate of mixing of each gas with the other across the interface is important, an interface that is not necessarily clearly defined, but can assume any of three possibilities, spherical, cylindrical or planar at various positions of the interface as the containing, sobering and smoothing effect of surface tension no longer prevails or exists. The problem also resolves itself into various transport coefficients, microscopic and macroscopic depending on whether each phase is treated as a continuum or not and which depends on the kind of flow established sub-sonic, super-sonic or hyper-sonic, all of which depend on the value of the mach number, M = V/a.