ESTIMATION OF THE DROP SIZE IN DISPERSED FLOW

The formulas for calculating the characteristic drop size for the mean Sauter diameter have been compared. The question on various forms of the size distribution of drops has been considered. To substantiate the applicability of the compared formulas for calculating the thermohydrodynamics in the circuits of nuclear power plants, experimental data on the wall temperature in a dispersed fl ow have been used. It has been shown that the Sauter diameter values calculated using the wall temperature in the supercritical region are in good agreement with sparse direct measurements of the drop size in steam–water fl ows. The drop sizes calculated using the tested formulas obtained for two-component gas–liquid fl ows or for single-component fl ows of coolants (various kinds of freons) and liquefied nitrogen turned out to be much lower. It has been shown that it is necessary to recalculate the numerical coeffi cients in the considered formulas in using them for steam–water flows.
The formulas for calculating the characteristic drop size for the mean Sauter diameter have been compared. The question on various forms of the size distribution of drops has been considered. To substantiate the applicability of the compared formulas for calculating the thermohydrodynamics in the circuits of nuclear power plants, experimental data on the wall temperature in a dispersed fl ow have been used. It has been shown that the Sauter diameter values calculated using the wall temperature in the supercritical region are in good agreement with sparse direct measurements of the drop size in steam–water fl ows. The drop sizes calculated using the tested formulas obtained for two-component gas–liquid fl ows or for single-component fl ows of coolants (various kinds of freons) and liquefied nitrogen turned out to be much lower. It has been shown that it is necessary to recalculate the numerical coeffi cients in the considered formulas in using them for steam–water flows.
Author:  N. D. Agafonova and I. L. Paramonova
Keywords:  dispersed fl ow, drop size, mean diameter, distribution function
Page:  840