When a coaxial thin wall jet flows over a sphere, it deflects along the backward surface of the sphere to collide itself at about the rearward center.
Intensive mixing process takes place within the colliding region and then a new kind of axisymmetric jet developes.
This phenomenon is named as the axisymmetric Coanda jet in this study.
Mean velocity, turbulence intensity, Reynolds stress and correlation coefficient have been measured in the Coanda jet region by using two-component, polarization Laser Doppler Velocimetry.
The development of the axisymmetric Coanda jet has been found to be determined primarily by the initial Reynolds number at the nozzle exit defined by $\frac{Ue\sqrt{2hD}}{\nu}$.
It appears that the separation point on the sphere exists at about 60 degrees from the nozzle exit which is independent of initial conditions.
The axial size of the bubble becomes smaller for the smaller Reynolds number.
Compared with a simple axisymmetric jet, the spreading rate of the half velocity jet width is about 1.35 times larger, and the axial mean velocity is reduced more slowly along the center line at a rate of $(X-Xo)^{-0.88}$.
When the radial gradient of the radial mean velocity is fairly great, the Reynolds stress is proportional to the multiplication of the radial gradients of the radial and axial mean velocities.
However, when it is negligible, the Reynolds stress is proportional only to the radial gradient of the axial mean velocity.
