Effects of wall thermal conductivity on entropy generation and exergy losses in a H2-air premixed flame microcombustor

► Exergy analysis of annular microcombustor for stoichiometric H2-air mixture. ► Reaction, conduction, diffusion are dominant entropy generators, in that order. ► Combustion irreversibility decreased at high wall conductivity. ► Increased heat losses at high wall conductivity reduced exergetic efficiency. ► Conductivity range of 0.1-1.75 W/m K is suitable.