Abstract: Very small particles of catalyst have been used in industry te enhance the effectiveness of catalyst. In such case, the capillary force caused by surface tension of liquid phase rapidly increases and a great number of liquid-phase bridges between particles is built. It is considered that hydro-dynamic performance and mass transfer for small particles greatly differ from those for large particles. This investigation studies the effect of flow condition and physical properties of liquid on gas-liquid interfacial area"a", when gas and liquid flow cocurrently downward through trickle bed of small particles. Correlations of"a"in trickle-flow and pulse-flow regimes were obtained by regression analysis.

摘要： 工业上为了提高催化剂内表面利用率,往往使用很小的催化剂颗粒。这时,液相表面张力引起的毛细管力迅速增加,颗粒间架起大量液桥,使小颗粒床中的流体力学情况和传质情况与大颗粒床有明显差异,从而影响气液有效界面积“a”的变化。本文研究了气液并流向下流过小颗粒滴流床时,流体流动条件和液体物性对“a”的影响。并得到滴流区和脉动流区“a”的关联式。