Computation of Heat Transfer from an Impinging Flame Jet to a Plane Surface

A computational uid dynamics and heat transfer analysis is performed to determine the convection and radiation heat transfer from an impinging ame jet to a plane surface. This paper focuses on analyzing the behavior of an impinging ame jet, including buoyancy e ects, turbulence in uence, and convective and radiative heat transfer processes. The combustion is modeled using a 12-species probability density function method for the reaction of a single hydrocarbon fuel species C12H23(l). The Reynolds-averaged Navier-Stokes with SST k − ω turbulence model and large eddy simulation with the Smagorinsky-Lilly sub-grid scale model are used to resolve the turbulent behavior of the impinging ame jet. The discrete ordinates radiation model is employed to determine radiative heat transfer to the impingement surface. Gas emissivity is estimated using the weighted sum of gray gasses model. Liquid fuel droplets interact with the turbulent gas medium in accordance with the discrete random walk model. Large eddy simulation and Reynolds-averaged Navier-Stokes simulations are carried out using a commercial computational uid dynamics code. The behavior of the jet is compared with literature data for validation. The results include the convective and radiative components of the total heat ux, as well as local Nusselt numbers and other primary solution variables throughout the ow eld.