Mist/steam heat transfer in confined slot jet impingement

Internal mist/steam blade cooling technology has been considered for the fu ture generation of Advanced Turbine Systems (ATS). Fine water droplets of a bout 5 mum were carried by steam through a single slot, jet onto a heated t arget surface in a confined channel. Experiments covered Reynolds numbers f rom 7500 to 25 000 and heat fluxes from 3 to 21 kW/m(2) The experimental re sults indicate that the cooling is enhanced significantly near the stagnati on point by the mist, decreasing to a negligible level at a distance of six jet widths from the stagnation region. Up to 200 percent heat transfer enh ancement at the stagnation point was achieved by injecting only similar to1 .5 percent of mist. The investigation has focused on the effects of wall te mperature, mist concentration, and Reynolds number.