Fig. 7 Film and jet flow. (a) The front side; (b) The reverse side; (c) Diagram of FJF.
Spray liquid distribution has a larger spray density than that of the overflow liquid distribution. Fig. 7 shows the flow pattern of FJF. The operating conditions are L W = 156 m3/(m2*h), F s= 0.8 (m/s*(kg/m3)0.5). The liquid phase sprays the plate unit surface through the tube-type liquid distributor. Because of the dispersed distribution of the liquid columns, most of the spray columns directly hit the surface of the unit and then spread out to form an uneven liquid film, as shown in Fig. 7a. Moreover, a small portion of the spray column hits the sieve area or flows through the holes directly. Other columns hit the edge of the holes, shearing into two parts. Columns with a larger vertical downward velocity component efflux from the sieve holes, while the ones with a larger horizontal velocity component gather on the liquid film on the surface of unit and spread continuously. Because of the high density of the liquid spray, the liquid film on the unit surface is thicker. With the influence of gravity and the driving force of the gas phase, the liquid phase on the sieve holes not hit with the spray columns will gradually gather and flow in the form of liquid columns. Therefore, there is a continuous outflow at each sieve hole on the back of the unit. However, because of the low gas velocity, the liquid column is less disturbed by the gas phase, and the boundary is clear, see Fig. 7b.
3.1.2.2. JMF