Abstract
Heat transfer experiments with a heated and rotating circular cylinder in an air crossflow were performed for subcritical freestream-Reynolds-number 8.3 · 103 < Re f < 7.1 · 104 and for Nusselt-numbers up to 300.
The experiments took into consideration important practical parameters such as freestream-turbulence intensity, aspect ratio, blockage ratio and temperature loading. The measured values were standardized to the ‘idealized case’ to allow adequate comparison with pertinent literature.
The results encompass the range of velocity ratios α (circular/freestream-velocity) between zero and 2.5. For values α > 0.5, the typical Nusselt-number behaviour noted by some authors has been confirmed.
For small velocity ratios α < 0.5, however, there are significant deviations from the heat transfer coefficients previously believed to be constant.
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Abbreviations
- A :
-
cylinder surface
- B :
-
width of tunnel
- D :
-
diameter of the cylinder
- h :
-
heat transfer coefficient, specific enthalpy
- h 0 :
-
specific enthalpy for standard state
- k :
-
roughness height
- L :
-
length of the cylinder
- L * :
-
scale of turbulence
- \(\dot m\) :
-
mass flow rate of heating oil
- n :
-
rotation rate in rpm
- Nu f :
-
Nusselt number based on film properties
- Q :
-
rate of energy
- T :
-
absolute temperature
- Tu :
-
turbulence intensity of inflow
- U :
-
velocity
- α:
-
ratio of pheripheral speed of the cylinder to free stream velocity = U r/U ∞
- λ:
-
thermal conductivity
- ν:
-
kinematic viscosity
- c :
-
corrected
- c :
-
convection (Eqs. 3, 5)
- f :
-
film properties i in
- inf:
-
infinite
- o :
-
out
- r :
-
rotation
- w :
-
wall
- ∞:
-
undisturbed flow conditions
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Peller, H., Lippig, V., Straub, D. et al. Thermofluiddynamic experiments with a heated and rotating circular cylinder in crossflow. Experiments in Fluids 2, 113–120 (1984). https://doi.org/10.1007/BF00296425
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DOI: https://doi.org/10.1007/BF00296425