This study numerically analyzed the heat transfer characteristics outside the condenser of a rotating heat pipe grinding wheel (RHP-GW).The goal of this investigation is to determine the optimal structure and parameters for the condenser section of RHP-GW.Different fin height (f=0-7 mm),rotational Reynolds number (Rer=1602-6408) and jet Reynolds number (Rej=42 379-108 302) were analyzed under input heat flux of 4000 W/m2.A fully developed flow was imposed at the outlet of the nozzles.Results showed that the optimal heat transfer rate was obtained for fin height of 5 mm,which improved the average Nusselt number by 84％ compared to the structure without fins.A critical Rej for each Rer that the impinging jet can reach the condenser section was found.The critical Rej value increases with Rer,which is in the range from 42 379 to 61 215 and 61 215 to 80 050 for Rer=6408 and Rer=9610,respectively.