Abstract
In the present study, to avoid water damage due to fire extinguishment, we are proposing utilization of liquid nitrogen for firefighting. To clarify the extinguishing effectiveness of liquid nitrogen on a diffusion flame, the blowoff experiments have been performed. In the extinguishing experiment, to reduce the amount of vaporization of liquid nitrogen and to avoid its scattering during the transporting process, a spherical capsule made of ice is used. The ice capsule filled with liquid nitrogen is dropped in free-fall from the height of 800 mm to the aluminum plate, in which the burner is embedded. The blowoff probability has been measured.
