Fire Safety Science Digital Archive

A study has been made of the evaporation in a bunsen flame of water drops suspended on quartz fibres. It was found that in the range of drop sizes investigated, 1.3 - 2.3 mm, the contribution of radiation to heat transfer was negligible in comparison with the contribution of convection, and that the heat transfer agreed with that calculated from Ranz and Marshall's law (3), if the calculated value of the heat transfer were multiplied by a constant factor of 0.63. An approximate formula has been developed to calculate the heat transfer by convection to water drops in a flame at a temperature different from that of a bunsen flame.