Enhanced heat transfer for thermionic power modules

Heat transfer systems required for high heat fluxes (20 w/sq cm) at high temperatures (1500 K) which advanced thermionic power modules upon combustion systems are described. Energy transfer from the hot combustion gases may take place by convection, radiation, or a combination of radiation and convection. Enhanced convective heat transfer with a jet impingement system was demonstrated in a thermionic converter. The cellular ceramic radiative heat transfer system was applied to a thermionic converter. By comparing the jet impingement and cellular ceramic radiative heat transfer systems, an appropriate system may be selected for utilization in advanced thermionic power modules.