Abstract: The transition from froth to spray regime on sieve trays was experimentally studied in an
air/water simulator with 300mm diameter. It has been found that the regime transition
occurs as the clear liquid height is equal to the residual pressure drop on the trays. A
convenient and accurate technique was proposed for determination of the regime transition
point. Based on analysis of the transition process at a sieve hole, a new formula which can
be used to correlate the experimental results was provided.

Key words: sieve tray, froth to spray regime transition, pressure drop, clear liquid height

摘要： The transition from froth to spray regime on sieve trays was experimentally studied in an
air/water simulator with 300mm diameter. It has been found that the regime transition
occurs as the clear liquid height is equal to the residual pressure drop on the trays. A
convenient and accurate technique was proposed for determination of the regime transition
point. Based on analysis of the transition process at a sieve hole, a new formula which can
be used to correlate the experimental results was provided.

关键词: sieve tray;froth to spray regime transition;pressure drop;clear liquid height