A CRITICAL-REVIEW AND EXPERIMENTAL-VERIFICATION OF THE CORRECT USE OF THE DYNAMIC METHOD FOR THE DETERMINATION OF OXYGEN-TRANSFER IN AERATED AGITATED VESSELS TO WATER, ELECTROLYTE-SOLUTIONS AND VISCOUS-LIQUIDS

Inconsistencies are frequently observed in data for the volumetric mass transfer coefficient for oxygen k// L-SCRIPT a obtained by various dynamic methods. The reasons for this phenomenon are critically reviewed. On the basis of our own experimental data for water, solutions of electrolytes, glycerol and carboxymethylcellulose, the various dynamic methods are compared with the result that only one variant gives correct results over a wide range of power dissipated per unit volume. In this variant, pure oxygen is introduced as a step input to a batch freed from any dissolved gas by, e. g. , vacuum desorption.