Fig. 4.

Ratio of the measured percentage of decrease in H_D to the predicted percentage of decrease in versus the corresponding measured percentage of decrease in H_D. Predicted values were determined by applying Eq. 1 and the microviscometric method to the μ-PIV data obtained from the glass-tube experiments. The light and dark shaded regions span, respectively, one and two standard deviations in the distributions around unity, where the standard deviation corresponds to 25%. The correlation coefficient, r_c, is 0.61.