Title: Interfacial turbulence: Mass transfer—gas/gas
Abstract: A study of Interfacial turbulence at interfaces formed by different phases is becoming increasingly important in transport effects across such interfaces, which impinge directly on the Engineering Sciences, hence technology and the military. 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. For example, the gas-gas interface would not fall under the same considerations of gas-liquid or liquid-liquid, which accounts for the sparsely available literuate on the subject, enhancing the difficulty of the contemplated problem. In this case also, with gas-gas interface in turbulent motion we have free turbulence, as it is not being influenced by a solid boundary, but unlike the physical situation of jets emitted into stagnant or slowly moving fluid or slower moving fluid where the rate of spreading in the flow direction is important. 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 the 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 = Va.