Power for agitation has been measured under aerated and unaerated conditions in a 0.29 m vessel of Rushton dimensions at specific powers up to 18 W/kg. The lluids studied were water. Newtonian solutions up to 19 m Pas and non-Newtonian shear thinning fluids some of which also exhibited a yield stress and some of which were viscoelastic. For the unaerated case. the power number-Reynolds number plot is in good agreement with the literature. For the aerated case, the resull can conveniently be divided into three Reynolds number regions. At Re > -900. the data obtained for the solutions is not markedly different [0 that for water except that a higher impeller speed is required to achieve complete gas dispersion. For -10 < Re < -900. the power drawn is independent of gassing rate and greater levels of elasticity and the presence of a yield stress leads to the lowest power numbers. For Re < --10. the gassed and ungassed power numbers are equal.
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