Abstract
As part of a study of factors affecting flame stability, some time ago we began an investigation into the influence of gas velocity on the flow conditions at a burner head ; in the first instance unignited media were employed. The technique of instantaneous shadow photography was chosen as best for the purpose, and a preliminary series of experiments showed propane or butane as most suitable gaseous media ; for, not only do the refractive indexes of these hydrocarbons differ widely from that of air, but, in addition, their immobility enhances the sharpness of the gaseous boundaries and the consequent clarity of the photographic records.
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References
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GABSIDE, J., HALL, A. & TOWNEND, D. Flow States in Emergent Gas Streams. Nature 152, 748 (1943). https://doi.org/10.1038/152748a0
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DOI: https://doi.org/10.1038/152748a0
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