中南大学学报（自然科学版）2011，Vol.42Issue(12)：3882-3887,6.
水平管降膜蒸发器壳程流场和温度场数值研究
Numerical research on flow field and temperature field in shell side of horizontal-tube falling-film evaporator
摘要
Abstract
In order to study distribution characteristics of flow field and temperature field in the shell side of the horizontal-tube falling-film evaporator, the self-built numerical software for the whole evaporator was developed based on a three-dimensional distributed parameter model. The distributions of thermal parameters were obtained. The variations of flow field, temperature field and other important parameters were also analyzed in detail. The results show that it is possible to achieve uniform liquid distribution at the bottom row of the first-tube-pass bundle by selecting uneven placement of the spray nozzles. The temperature of seawater reaches the saturation temperature in the present geometrical dimensions and working conditions after it has escaped from second-tube-pass bundle. The maximum of overall heat transfer coefficient tends to locate at the inlet positions of the bundle. Furthermore, the maximum salinity of seawater is 56 g/kg, which locates.at the bottom row of the first-tube-pass bundle. The concentration factor of seawater should be no more than 2.5 and the temperature is below 70 ℃ to prevent the scale formation on the heat transfer surfaces.关键词
水平管降膜蒸发器/流场/温度场/分布参数模型Key words
horizontal-tube falling-film evaporator/ flow field/ temperature field/ distributed parameter model分类
能源科技引用本文复制引用
侯昊,毕勤成,张晓兰..水平管降膜蒸发器壳程流场和温度场数值研究[J].中南大学学报（自然科学版）,2011,42(12):3882-3887,6.基金项目
国家重点基础研究发展计划("973"计划)项目(2009CB219805) （"973"计划）
