采用溶胶-凝胶技术在传热管表面涂覆TiO2/SiO2复合溶胶涂层,并通过优化热处理温度和干湿交替处理工艺,提升涂层的亲水性能和强化传热性能。试验结果显示,在热处理温度为200℃时,凝胶涂层以无定型结构为主;热处理试样经过6次干湿交替处理后,即可使表面接触角降低到10°左右;传热管表面较好的润湿性能,可显著提升降膜式换热器的换热效率。 The surface of heat transfer tube is coated with TiO2 / SiO2 composite sol coating by sol-gel technique, and the hydrophilicity and heat transfer performance of the coating are improved by optimizing the heat treatment temperature and alternate wetting and drying process. The results show that the gel coating is dominated by an amorphous structure when the heat treatment temperature is 200 ℃. The surface contact angle can be reduced to about 10 ° after 6 cycles of wet-dry treatment. The heat transfer tube Better surface wetting performance, can significantly enhance the heat transfer efficiency of the falling film heat exchanger.