Ceiling Jet Properties and Wall Heat Transfer in Compartment Fires near Regions of Ceiling Jet-Wall Impingement

摘要

The problem of heat transfer to walls from fire plume-driven ceiling jets during compartment fires is introduced. An analogy is drawn between the flow dynamics and heat transfer at ceiling jet-wall impingement and at the line impingement of a wall and a two-dimensional, plane, free jet. Using the analogy, the literature on plane, free jet flows and corresponding wall stagnation heat transfer rates leads to readily useable estimates for the heat transfer from, and the mass, momentum, and enthalpy fluxes of the turned compartment fire ceiling jet as it begins its initial descent as a negatively buoyant flow along the compartment walls. Available data from a reduced-scale experiment provides some limited verification of the heat transfer estimate.