溴化锂浓度及纳米颗粒对气泡泵流型及提升量影响的实验研究

Experimental investigation on effect of Li Br concentration and nano-particle on flow pattern and lifting capacity of bubble pump

为改善气泡泵特性,了解溴化锂溶液浓度和纳米颗粒添加量对气泡泵流型及溶液提升量影响、不同流型对溶液提升量影响十分必要.搭建两级气泡泵吸收式制冷实验台,利用高速摄像仪记录气泡在一级提升管内运动过程,探究不同条件下流型之间的差异以及对溶液提升量的影响.实验结果表明:管内先后出现泡状流、弹状流、段塞流、搅拌流和环状流五种流型;弹状流、段塞流和环状流对溶液提升量均随浓度的增大而增大,随纳米Cu O添加量增大而增大,但纳米添加剂添加量大于0.25%后,溶液提升量不再提高.

In order to improve the characteristics of the bubble pump,it is necessary to understand the influence of the concentration of lithium bromide solution and the amount of nanoadditive on the bubble pump flow pattern and solution lift,and the effect of different flow patterns on the solution lift.A two-stage bubble pump absorption refrigeration experiment bench was set up.Experiments were carried out by using the high-speed camera to record the movement of bubbles in a first-stage riser to study the difference of flow patterns and their effect on the lift amount of solution under different conditions.The experimental results show that there are five flow patterns：bubbly flow,slug flow,plug flow,churn flow and annular flow in succession.The lift amount of solution in slug flow,plug flow and annular flow increases with increase of lithium bromide concentration in the solution and the amount of nano-Cu O in the solution until the amount of nano-additives reaches 0.25%.