ISSN Online: 2377-424X
ISBN Print: 0-89116-299-2
International Heat Transfer Conference 7
THEORETICAL AND EXPERIMENTAL STUDY OF TURBUlENCE EFFECTS ON HEAT TRANSFER AROUND THE STAGNATION POINT OF A CYLINDER
Abstrakt
A study on heat transfer enhancement around
the stagnation point of cylinder in a turbulent
crossflow is conducted in special consideration
of behaviors of anisotropic turbulence intensity
and length scale in the free stream. A new turbulence
model consisting of the k - ε equations and
a newly proposed anisotropy equation is introduced
to explain the production of turbulence energy due
to anisotropy between the longitudinal and lateral
Reynolds stress components in the free stream. To
verify the validity of the turbulence model, accurate
turbulence measurements are made in the free
stream around a cylinder in a wind tunnel by varying
independently turbulence intensity, length scale
and Reynolds number, and the amplification of turbulence
energy due to anisotropy is confirmed to
agree with the prediction. The calculated stagnation-
point heat transfer rates are found to agree
well with the experimental results reported so far.