Drag reduction correlations

Abstract

values.The mass transfer between fluid elements is considered to be caused mainly by coalescence and dispersion, and thus the overall mass transfer coefficient may be dependent on frequency of coalescence and dispersion, contact time, and contact area of fluid elements. Although U might be expected to vary with agitation speed, we assumed U to be a constant. The values of p were computed for parametric values of U, with k = 1.10, B = 0.10, K = 0.10, Z1 =297, and I 2 = 1.0. In Figure 4, the calculated values of P are plotted vs. the period T together with the experimental results by using f = 0.5 for bafflled and 0.25 for unbaffled vessels. A comprehensive geometrical model has not been made. For periods greater than 10 sec., the calculated reaction rates are relatively insensitive to period but are dependent upon the mass transfer rate. At small periods, the reaction rates is insensitive to the mass transfer rates. The analytical and experimental methods for the chloral hydrate system indicate sufficient concurrence to merit reporting the simple approaches used for the model.