Abstract: The measurement of flow pattern on a sieve tray reveals that there exist a reversed flow zone near the inlet weir, a slow flow zone with circulation at the segmental sides of tray and an unevenly distributed main flow zone. Based on the measurement of liquid flow distributions,a simple hybrid model for plate efficiency was suggested. Comparison between the prediction by the present model and the others from literature shows that the present one is sufficiently accurate.

摘要： <正>引言 塔径较大的塔板上液体流动的不均匀性对板效率的影响早已引起了人们的注意,在大型塔板上,由于气液两相的剧烈湍动,致使不同区域液体的流动各不相同,如果只采用单一形式描述塔板上液体的运动特点,未免有失普遍性。因而,本文将在分析塔板上液体运动特点的基础上,提出一种新的计算模型,力求更好地符合实际情况。1 实验现象 塔板上流体力学的测定是在前已述及的装置上进行的,用热膜风速仪直接测定了塔板上气液两相流场的分布,发现不仅塔板弓形区存在返混,而且塔板入口堰附近一段距离内,液体也存在返混,其具体长度随液流强度、气相负荷以及出口堰高度等因素而异。采用逐步回归分析方法对实验数据进行回归,得到入口堰返混段长度关联式