©　2017,　Editorial　Department　of　＂Journal　of　Engineering　for　Thermal　Energy　and　Power＂.　All　right　reserved.The　flow　and　heat　transfer　characteristics　of　air/mist　coolant　in　the　rotating　ribbed　U-shaped　channel　were　numerically　investigated　by　using　SST　turbulence　model.　The　effect　of　initial　mist　diameter　and　temperature　on　the　mist/air　cooling　parameters　was　analyzed.　The　results　showed　that　the　droplets　move　towards　trailing　wall　at　the　first　pass　of　the　rotating　channel,　while　at　the　second　pass　droplets　move　towards　leading　wall.　When　the　initial　mist　diameter　decreases,　the　mist　diameter　in　heating　section　decreases,　resulting　in　higher　heat　transfer.　At　the　same　time,　the　mist　concentration　also　decreases,　leading　to　lower　heat　transfer.　Therefore,　there　exists　an　optimal　initial　mist　diameter　for　heat　transfer　performance.　The　mist　flow　distance　and　heat　transfer　enhancement　increase　as　mist　temperature　decreases.