Measurements and heat-flux transport modelling in a heated cylinder wake

• Published in: International journal of heat and fluid flow Vol. 19; no. 5; pp. 556 - 562
• Main Authors: Wikström, Petra M., Hallbäck, Magnus, Johansson, Arne V.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY Elsevier Inc 1998; Elsevier Science
• Subjects: Convection and heat transfer; Cylinders (shapes); Engineering Mechanics; Equations of motion; Exact sciences and technology; Fluid dynamics; Fundamental areas of phenomenology (including applications); Jets; Mathematical models; Physics; Stress analysis; Teknisk mekanik; Temperature measurement; Turbulence; Turbulent flows, convection, and heat transfer; Velocity measurement; Wakes; Transport equation; Turbulent flow; Wind tunnel test; Wakes; Circular cylinder; Heat flow; Experimental study; Velocity measurement; Hot wire anemometers; Temperature fluctuation; Heat transfer
• ISSN: 0142-727X; 1879-2278; 1879-2278
• DOI: 10.1016/S0142-727X(98)10018-8

Hot-wire measurements of velocity and temperature fluctuations have been made in the self-preserving turbulent wake region of a heated cylinder. Second order statistics including Reynolds fluxes,
u
iθ
, are determined along with relevant triple correlations appearing in the Reynolds stress and Reynolds flux transport equations. The primary aim with these measurements is to study different modelling levels for passive scalar quantities. Models for the pressure scalar-gradient correlation, appearing in the transport equation of the Reynolds fluxes, are compared to measured data. A significant improvement of the simplest model,
−c
1T(1/τ)
u
iθ
, is achieved by including a model for the rapid term that is linear in the mean velocity gradients. The mixed timescale,
k
θ
2
/εε
θ
, seems to be an appropriate choice for
τ. Also models for the triple correlations,
u
iu
jθ
, are compared with the experiments.