oil concentration by volume as an internal phase and has the drainage temperature higher than taking movie, and the measurement of temperatures, on and above the surface of the gel from the time when the flame is coming over to the time when it has passed away, was carried out with thermocouples fixed in place. While the flame is spreading on the gelled JP-4, an advance liquid flow ahead of the flame virgin gel, issued from the upstream region covered already with luminous flame, and is not

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... ed by radiative and conductive heat transfer from the flame pillar to the virgin gel surface. In view fractions seem to have burned in the flame zone before streaming out on the virgin gel surface. The behavior of liquid flow was observed in detail with fine aluminum powders sowed in the vicinity of the ignition position. As the result, it is found that in the foregoing liquid flow there is a strong convection due to temperature gradient. Thus, the covering of the liquid flow on the virgin gel plays a role to reduce the drainage rate of the gel, protecting the gel surface from being exposed in air in the place close to hot flame, and the flame spreading velocity can be suppressed by one-tenth to one-twentieth, compared to that of the original JP-4.