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准确预测溶液管间流型是利用水平管降膜技术的吸收器和蒸发器确定不同流量下传热传质性能的前提。建立了水平管降膜实验台,以水和4种不同浓度的CaCl2溶液作为测试流体,对不同Re数流体管间流型转变过程进行了实验研究。利用最小方差法拟合实验数据,得到流量减小、增大及忽略流量变化方向的流型转变关系。研究结果表明:滞后现象存在流体的每一个流型转变过程中;CaCl2溶液流型转变对应的Re数随溶液浓度增大而减小;吸收剂质量流量不变,随着吸收过程的进行,可能发生反向流型转变。
Accurately predicting the flow pattern between solution tubes is the prerequisite for determining the heat and mass transfer performance under different flow rates by the absorber and evaporator of horizontal tube falling film technology. A horizontal tube falling film experiment platform was set up. Using CaCl2 solution of water and four different concentrations as the test fluid, the experimental study on the flow pattern transition between different Re number flow tubes was carried out. The experimental data were fitted by the least-variance method, and the flow pattern change relation of decreasing, increasing and neglecting the flow direction was obtained. The results show that: the hysteresis phenomenon exists during the transition of each flow pattern of the fluid; the Re number corresponding to the flow pattern transition of the CaCl2 solution decreases as the concentration of the solution increases; and the mass flow of the absorbent remains unchanged. As the absorption process progresses, Reverse flow patterns have occurred.