Raschig - Conventional Trays

Conventional trays are cross flow trays. Liquid descending from the tray above emerges from the inlet down comer and flows across a rapidly diverging/converging open channel or tray active area to the outlet down comer. Vapour from the tray below is forced through the active area into the cross flowing liquid to produce a two-phase mixture of aerated liquid. The nature of the aerated liquid is dependant upon the relative vapour and liquid velocities and the vapour-liquid contact openings on the tray active area.