Abstract

A study has been made of inflammibilty characteristics of suspensions in air of mists derived from oils of low volatility, particularly cutting oils not of the 'soluble' type. With mists formed by condensation from a saturated vapour/air mixture the lower limit of flammability on a weight basis is of the same order as expected for the corresponding vapour. The inflammable range, however, seems less for the mist than for the vapour, which is probably associated with the observation actually made that the mist flame is the more easily suppressed by the addition of a particular diluent to the air supporting combustion. The effect of incombustible liquids added to the oil drops was studied in mists mechanically formed at an air jet. The results can be interpreted qualitatively in terms of the thermal capacity of the added liquid and the flame suppressing effect of its vapour.

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