Fig. 13 Variations with (a) gas phase kinetic factor and (b) liquid spray density of the rotational flow ratio for the gas-liquid phase in overflow distribution.
As shown in Fig. 13b, the rotational flow ratio for the gas phase increases slowly with increasing liquid spray density. With the increasing liquid phase spray density, the liquid layer above the sieve holes under all flow patterns gradually thickens, resulting in an increase in the resistance of perforated flow for the gas phase, which decreases the proportion of perforated flow and enlarges the proportion of rotational flow. Therefore, the gas-phase rotational flow ratio increases gradually. The rotational flow ratio for the liquid phase decreases first and then increases with increasing liquid spray density. The turning point is approximately L W = 78 m3/(m2*h) because the flux for the sieve holes is limited. Within the load capacity, the perforated flow for the liquid phase continuously increases, and the rotational flow ratio decreases with increasing spray density. However, after exceeding the capacity of the sieve hole load, the perforation fluid volume reaches its limit, and then, the perforation liquid phase will not increase with increasing spray density. The liquid phase can only flow out in the form of rotational flow. Thus, the rotational flow ratio increases slightly. For a comparison, the rotational flow ratio for the liquid phase with the gas-phase kinetic factor F s= 0 is shown in Fig. 13b. The rotational flow ratio also decreases first and then increases, slightly less than 0.5. The turning point occurs atL W = 52 m3/(m2*h). Therefore, under the structural parameters of this unit, when only the liquid phase is present, the rotational flow for the liquid phase and the perforated flow also account for roughly half. Increasing the kinetic energy factor of the gas phase will promote the perforation flow of the liquid phase and make the load limit of the sieve holes lag.

3.4.2. Rotational flow ratio in spray distribution