Effect of obstacles on the detonation diffraction and subsequent re-initiation

The enthalpy diffusion flux in the multicomponent energy equation is a well known yet frequently neglected term. It accounts for energy changes, associated with compositional changes, resulting from species diffusion. Enthalpy diffusion is important in flows where significant mixing occurs between species of dissimilar molecular weight. The term plays a critical role in preventing local violations of the entropy condition. In simulations of nonpremixed combustion, omission of the enthalpy flux can lead to anomalous temperature gradients, which may cause mixing regions to exceed ignition conditions. The term can also play a role in generating acoustic noise in turbulent mixing layers. Euler solvers that rely on numerical diffusion to mix fluids cannot accurately predict the temperature in mixed regions. On the other hand, Navier-Stokes solvers that incorporate enthalpy diffusion can provide much more accurate results.

Enthalpy Diffusion in Multicomponent Flows

Investigation of CH4 and porous media addition on thermal and working performance in premixed H2/air combustion for micro thermophotovoltaic

Jacqueline Owigo

Papers

Influence of concentration gradient on detonation re-initiation in a bifurcated channel

Influence of concentration gradient on detonation re-initiation in a bifurcated channel

Effects of hydrogen-addition on the FREI dynamics of methane/oxygen mixture in meso-scale reactor

Effects of hydrogen-addition on the FREI dynamics of methane/oxygen mixture in meso-scale reactor

Near-wall dynamics of premixed methane/air flames