Abstract
We have investigated turbulence of surfactant solution in a precessing sphere by means of laboratory experiments(particle image velocimetry).A weak precession(the precession rate Γ = 0.1) of spherical vessel sustains strong turbulence of the confined fluid.So we compare mean velocity fields of turbulence of water with those of surfactant solution for the fixed precession rate at Γ= 0.1 and different Reynolds numbers.It is then shown that turbulent structure is drastically changed in the inner region of the sphere,and that this turbulence modulation is stronger for higher Reynolds numbers.
