The　heat　transfer　of　swirling　and　conventional　CO2-air　submerged　jet　impingement　was　experimentally　studied　with　thermo-chromic　crystal　liquid　technique.　The　experiment　is　focused　on　the　verification　of　the　swirling　jet　effect　on　the　distribution　of　the　local　heat　transfer　coefficient　on　the　impinged　target　surface.　In　the　range　of　Re　=　7500-28　300,　distributions　of　the　local　Nusselt　number　were　obtained　and　compared　with　other　researcher＇s　results.　It　is　revealed　that　the　swirling　of　the　jet　improves　the　radial　uniformity　of　the　heat　transfer　significantly.　The　heat　transfer　deteriorates　in　the　stagnation　region　but　gets　enhanced　in　the　wall　jet　region.　The　relative　magnitude　of　the　Nusselt　number　for　the　swirling　and　non-swirling　jets　reverse　in　the　range　of　r/D　=　0.35-0.95.　In　addition,　the　swirling　jet　also　enhances　the　heat　transfer　in　terms　of　the　mean　Nusselt　number　in　a　larger　r/D　area.　(C)　2006　Elsevier　Inc.　All　rights　reserved.