Chiang Mai Journal of Science

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The fire-fighting foam spreading by digital image visualization was carried out on three substrate surfaces; glass, foam solution and diesel fuel surface. Foam with expansion ratio in the range of 6.6 to 25 was applied immediately after its generation on each surface inside a confined chamber. The development of foam frontlines, in both the top-view and side-view modes, were visualized by a high speed camera and analysed by digital image processing. The spreading velocities for the different cases were obtained and compared. Both, the type of the substrate surface and the foam expansion ratio play roles on spreading as the macroscopic factors. In addition, it was found that the expansion ratio of the foam had a direct effect on
the frontline development. In a microscopic scale, the static drainage of various expansion ratios of foams was examined and it was found that all the foams gave the same profile of liquid holdup. Finally, it can be concluded that foam with lower expansion ratio is more effective to combat the fire than the others.

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