Abstract
With regard to the horizontal motion of hot fire products from a growing fire source in a full scale concrete corridor, velocity and temperature were measured using newly designed smoke-wire systems and an array of thermocouples. Based on the photographic records of vertical profiles of velocity and together with those of temperature, the horizontal motion subject to the turning process can be divided into two regimes: A supercritical region with jump where both the Reynolds number and the ratio of Reynolds number to Richardson number exceeds 3 × 104. Succeeding it is a subcritical region where slight mass extraction occurred through the free interface. It was found that the average velocity increased in proportion to the 1/3 power of the burning rate and was dominated by the magnitude of heat conductivity of the ceiling material. Covering these two regimes, the consistency of the relationship between buoyancy and apparent circulation was confirmed instead of the buoyancy-momentum relationship, except in the earlier stage of combustion.
© 1981 Center for Fire Science and Technology, Research Institute for Science and Technology, Tokyo University of Science
