液相介质对水平气液间歇流动的压降影响

研究了水平管内不同液相介质(水、油和不同浓度的CMC溶液)对气液两相间歇流动压降的影响. 实验管道为内径50 mm的透明有机玻璃管，从入口到分离器长约30 m，实验段由2个长3 m的水平管组成. 共记录了320组不同表观流速下的压降信号：油相0.17~1.85 m/s，水相0.17~2.48 m/s，CMC溶液0.17~1.42 m/s，气相0.06~3.40 m/s. 结果表明，液相为牛顿流体(油或水)的气液流动，随着表观气相流速的增大，压降呈增加趋势；非牛顿幂率流体(不同浓度的CMC溶液)的管道流动，当流动指数低于一定值时，压降随气相流量的增加呈降低趋势，并且低于单液相流动的压降. Lockhart-Martinelli模型过高地预测了气-非牛顿幂率流体两相的压降.

Effects of Liquid Phase Properties on Pressure Drop during Horizontal Gas-Liquid Intermittent Flow

The effects of different liquid phases (water, oil and CMC solutions) on pressure drop during horizontal gasliquid intermittent flow were experimentally investigated. The total length of the pipe between the entrance and the separation unit is approximately 30 m. The test section consists of two 3 m long horizontal pipes. Up to 320 experimental tests have been conducted under the following conditions: superficial oil velocity 0.17~1.85 m/s, superficial water velocity 0.17~2.48 m/s, superficial CMC solutions velocity 0.17~1.42 m/s and superficial air velocity 0.06~3.40 m/s. It is shown that for gasNewtonian liquid flow the pressure drop increases with the increase of the superficial air velocity at constant superficial liquid velocity. But for power-law liquid with the lower value of flow behavior index, the pressure drop of gasnon-Newtonian liquid flow might actually be reduced below the value for the liquid flowing alone at the same volumetric rate. Furthermore, the LockhartMartinelli model overestimates the pressure drop for gaspower-law liquid flow.