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Thermofluiddynamic experiments with a heated and rotating circular cylinder in crossflow

Part 2.2: Temperature boundary layer profiles

Abstract

Two-dimensional flow fields and temperature boundary layer profiles around a heated and rotating circular cylinder in crossflow were experimentally investigated for a subcritical freestream-Reynolds-number 5.6 · 104 corresponding to a flow velocity of 7 m/s. Test parameter was the ratio of free stream velocity to peripheral speed, which encompasses the range between zero and 2.5. An electronically-controlled hot wire measurement technique, practicable for the requirements of 1–2 mm boundary layer thickness, was used. The numerous reliable test results confirm previous reported experiments. Characteristic features in heat transfer are discussed.

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Abbreviations

C b :

correction factor for blockage

n :

rotation rate in rpm

r :

radial coordinate

R :

cylinder radius

Re :

Reynolds-number = U 2R/v

Re R :

circumferential Reynolds-number = U R 2R/v

T :

local temperature

U :

velocity

α = U · C b/U R :

velocity ratio of air flow and cylinder surface, corrected for blockage

v :

kinematic viscosity

θ = TT /T wT :

non-dimensional temperature

:

undisturbed flow conditions

w :

wall

R :

circumferential

c :

critical

References

  1. Anderson, J. T.; Saunders, O. A. 1953: Convection from an isolated heated horizontal cylinder rotating about its axis. Proc. R. Soc. London Ser. A 217, 555–562

  2. Kays, W. M.; Bjorklund, J. S. 1958: Heat transfer from a rotating cylinder with and without crossflow. Trans. ASME 80C, 70–78

  3. Peller, H.; Lippig, V.; Straub, D.; Waibel, R. 1984: Thermofluid-dynamic experiments with a heated and rotating cylinder in crossflow. Part 1: Subcritical heat transfer measurements. Exp. Fluids 2, 113–120

  4. Peller, H. 1986: Thermofluiddynamic experiments with a heated and rotating circular cylinder in crossflow. Part 2.1: Boundary layer profiles and location of separation points. Exp. Fluids 4, 223–231

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Additional information

Dedicated to Alfred Walz on the occasion of his 80th birthday

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Peller, H., Straub, D. Thermofluiddynamic experiments with a heated and rotating circular cylinder in crossflow. Experiments in Fluids 6, 111–114 (2004). https://doi.org/10.1007/BF00196461

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Keywords

  • Heat Transfer
  • Boundary Layer
  • Circular Cylinder
  • Boundary Layer Thickness
  • Free Stream