直接接触式冰浆生成器参数分析及设计要点

为了提高冰浆生成器的传热性能,采用求偏导的方法对影响冰浆生成器性能的各参数进行理论分析.根据圆断面射流理论,得到换热效率与液柱高度的关系式,结果表明：当液柱高度为喷嘴直径的50倍时,换热效率≥0.9.进一步推导体积传热系数的公式,给出冰浆生成器的设计要点：冰浆生成器高度应为喷嘴直径的100倍,冰浆生成器直径应小于喷嘴直径的14倍以避免径向传热.最后对分析结果进行了实验验证,实验与理论分析结果一致：随着气体质量流量和气体比定压热容的增加以及气体进口温度的降低、制冰溶液体积的减少,体积传热系数增加.

Parameter analysis and design point of direct-contact ice slurry generator

All the parameters that affect the ice slurry generator performance were theoretically analyzed using the partial differential solving method in order to improve the heat transfer performance. According to the circle section jet theory, the relationship between the heat transfer efficiency and the water solution height was obtained. The results show that the heat transfer efficiency is not tess than 0.9 when the water solution height is 50 times of the nozzle diameter. Further, the volumetric heat transfer coefficient was derived, and several key points of the ice slurry generator design were presented as follows: to avoid heat transfer in radial direction, the generator height should be 100 times of the nozzle diameter, and the generator diameter should be less than 14 times of the nozzle diameter. Finally, experiments were done to verify the analysis results. The results obtained by both experiments and analysis agree that with the increase of both the gas mass flow rate and the gas specific heat capacity, and with the decrease of both the gas inlet temperature and the water solution volume, the volumetric heat transfer coefficient increases.