Lean mixture Subject

Phase inversion refers to the controlled transformation of a cast polymeric solution from a Hquid into a soHd state. During the phase-inversion process, a thermodynamically stable polymer solution is usually subjected to controlled Hquid-H-quid derabdng. This phase separation of the cast polymer solution into a polymer-rich and a polymer-lean phase can be induced by immersion in a non-solvent bath ( immersion precipitation ), by evaporating the volatile solvent from a polymer that was dissolved in a solvent/non-solvent mixture ( controlled evaporation ), by lowering the temperature ( thermal precipitation ) or by placing the cast film in a vapor phase that consists of a non-solvent saturated with a solvent ( precipitation from vapor phase ) [1]. 

When the flame is subjected to small-scale curvatures, which is typical for lean H2 + air mixtures, an experimenter does not measure a normal velocity, but blindly measures some velocity depending on the level of the developing front. The front perturbation at an initial pressure of atmospheric or lower may be insufficient for a significant increase in the flame surface area. Therefore, even with the blind method of measurement in [26, 41], plausible results were obtained in the range between 0.05 and 0.1 MPa. 

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