Abstract
Concerning the turbulent flow in vertical cylindrical tanks which have no baffle and are agitated with a two-blade-paddle at the centre, some experiments and calculations were carried out.
1) From the data presented by several investigators. we derived Eq. (1), regarding velocity distributions in the tank. The experimental data on the two parameters, δ and ξ, were als obtained.
2) Power consumption and torque supplied to the liquid by the paddle were measured.
3) Spreads of the coloring substance diffused along the main stream in time t were measured by means of many photographs. As the result, eddy diffusivityε, turbulence velocity √v2, mixing length l and t0 were calculated.
4) Distribution of Reynolds stress τ, rate of dissipation of energy Eτ and average size of an eddy λ were calculated, Also, eddy viscosity ε' were calculated in order to check the above results. These are shown in Fig. 5 and 6.
It is difficult to deduce a general correlation between degree of agitation and that of turbulence from these experimental results, therefore, Fig. 7 and 8 might be understood to represent rough estimation.
