HEAT-TRANSFER FROM FLAMES BETWEEN VERTICAL PARALLEL WALLS

Measurements of the distribution of total heat flux on a wall exposed to a line burner have been carried out for a number of configurations in which the distance to a parallel wall has been varied. It has been shown that the heat fluxes increase as the separation between the wall s is reduced. The burner position and heat output influence not only t he levels of heat flux, but also the distribution pattern. Changing th e air flow by blocking the ingress of air at the base of the walls is shown to have a dramatic effect The most extreme case gave almost a fo ur fold increase in the maximum heat flux when the base is closed off Correlations have been obtained with a line burner symmetrically place d against an instrumented wall for q(w)(n) in terms of X/Q(1)D-2/3, y '/D, and a/D, with correlation coefficients of at least 0.957. The res ults and findings have implications for modelling flame spread in conf ined spaces, and for identifying and assessing the risks associated wi th the bulk storage of materials.