Corrosion problem of metallic surfaces has resulted in a bottleneck situation deterring widespread acceptability of liquid desiccant air conditioning systems. In the current experimental study, mass transfer analysis of non-corrosive polypropylene plastic surfaces, Plain and Modified solid circular cylinders, are investigated on an adiabatic vertical falling film tower. The performance of the vertical solid PP circular cylinder surfaces is compared with PP plate surface to deduct suitable surface for the development of low flow liquid desiccant air conditioning systems. It is found that under the tested conditions, the mass transfer coefficient of the Plain PP circular cylinder is 1.65 times superior to Plain PP plate. The optimal mass transfer coefficient of ∼20 g/m²s for the Plain PP circular cylinder is obtained at ∼1.5 ratio of the mass flow rate of liquid to air, whereas the mass transfer coefficient of the Modified PP circular cylinder continuously increases for the studied range of the mass flow rate of liquid to air ratio. Furthermore, a new generalized correlation for Sherwood number is proposed to predict the performance of different types of falling film towers (plastic/metallic) under adiabatic/non-adiabatic operating conditions by incorporating dynamic flow characteristics, driving thermal and mass transfer potential and wetness characteristic factor$.$The mean effective error of the current correlation against nine experimental datasets is 16.6%.

金属表面的腐蚀问题已导致阻碍液体干燥剂空调系统广泛接受的瓶颈情况。在当前的实验研究中，在绝热垂直降膜塔上研究了非腐蚀性聚丙烯塑料表面、普通和改性实心圆柱体的传质分析。将立式实心PP圆柱面与PP板面的性能进行比较，推算出适合开发低流量液体除湿空调系统的面。结果表明，在试验条件下，Plain PP圆柱体的传质系数比Plain PP板高1.65倍。最佳传质系数 ∼20 g/m ²普通 PP 圆柱体的 s 是在液气质量流量比约为 1.5 时获得的，而改进型 PP 圆柱体的传质系数在研究的液气比质量流量范围内不断增加. 此外，提出了一种新的 Sherwood 数广义相关性，通过结合动态流动特性、驱动传热和传质势以及湿度特性，预测不同类型降膜塔（塑料/金属）在绝热/非绝热操作条件下的性能因素$.$当前相关性与九个实验数据集的平均有效误差为 16.6%。