Figure 9 . Bubble size (Sauter mean diameter) measurement in water and different aqueous solutions of glycerin.
It was attempted to find the functional form f () between the scaled bubble size and scaled specific input power in Equation (14). Hinze38 suggested a power law correlation (Equation 15) between the scaled bubble size and scaled specific input power. The current study found a power law correlation with similar power (slopes) to that of Hinze38 (see Equation 16). Bubble size measurements from Mohagheghian and Elbing47 were used for further validation of Equation (16). Note that Mohagheghian and Elbing47 measurements were carried out in the same test facility; however, a single point air injection method was used for bubbling the column. Figure 10 shows that data from the present study, Hinze,38 and Mohagheghian and Elbing47 collapse on Equation (16) (dashed black line). To further examine the present correlation for scaling the bubble size, similar studies39,40 were used to check validity of the present correlation.