This experimental work examines the thermal performances of rotating two-phase thermosyphon disc ((RTD)-T-TP) using centrifugal forces to drive vapor-liquid circulation at sub-atmospheric pressures with cooling applications to electrical rotor machineries. Boiling flow images, boiling/condensation heat transfer rates and the composition of total thermal resistances (R-th,) for the (RTD)-T-TP are examined at rotor speeds of 250, 500, 750 and 1000 rev/min with four sets of boiling numbers (Bo) and condenser thermal resistances (R-th,R-con) at each rotor speed. Experimental conditions in terms of Bo, R-th,R-con and relative centrifugal acceleration (Omega) are in the respective ranges of 70-153, 0.065-0.25 KW-1 and 4.3-70. While both boiling and condensation heat transfer rates are raised by increasing rotor speed, heat transfer properties over the evaporator and condenser of present (RTD)-T-TP are respectively improved and impeded by raising Bo. Due to the combined Bo and Omega effects on each constituent thermal resistance of R-th, the total thermal resistance of the present (RTD)-T-TP is reduced by increasing Bo and/or Omega. Empirical correlations determining the boiling/condensation heat transfer rates and the evaporator pressures as well as R-th that permit the evaluations of individual and interdependent effects of Omega, Bo and R-th,R-con are generated to assist engineering applications. (C) 2013 Elsevier Ltd. All rights reserved.