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This paper describes an experimental investigation, by means of hot-wireanemometry, of the characteristics of velocity and temperature in a rotatingturbulent boundary layer under isothermal and non-isothermal conditions. Theranges of experimental parameters are: Reynolds number from 10000 to 25000,rotational speed from 0 to 150 rpm, and y+ from 1.8 to 100. The relativetemperature difference is held constant at 0.1. Detailed velocity andtemperature distributions in the boundary layer are measured in the rotatingstate, and a new criterion for boundary layer segmentation under rotation isproposed. The applicability of boundary layer theory under the rotating stateis extended. The influence of Coriolis force and buoyancy on the velocity andtemperature distributions in the turbulent boundary layers are analyzed.Coriolis force is found to play an important role in the behavior of theboundary layer under rotation, as it shifts the velocity and temperatureboundary layers. Under isothermal conditions, such effects can be classifiedaccording to the dominant force: viscous, Coriolis, or inertial. Undernon-isothermal conditions, buoyancy occurs. The buoyancy induced by theCoriolis force suppresses the effect of the Coriolis force, and the suppressioneffect increases with temperature difference. The variation of turbulentPrandtl number Prt under rotation is also obtained.

Temperature and Velocity Characteristics of Rotating Turbulent Boundary Layers Under Non-Isothermal Conditions