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本文通过采用物理气相沉积法于TiO_2纳米管阵列表面修饰一层聚四氟乙烯(PTFE)纳米颗粒,得到超疏水表面,并研究此超疏水纳米结构表面的池沸腾特性。研究表明,超疏水纳米结构表面沸腾特性类似于膜沸腾,沸腾工质难以浸润该表面,其沸腾传热系数及临界热流密度均较低。分析表明,固液处于Cassie-Baxter接触状态,纳米结构表面向沸腾工质给热效率低,是超疏水纳米结构表面沸腾效率低的主要原因。
In this paper, a layer of polytetrafluoroethylene (PTFE) nanoparticles was modified on the surface of TiO 2 nanotube arrays by physical vapor deposition method to obtain superhydrophobic surfaces, and the pool boiling characteristics of the superhydrophobic nanostructured surfaces were investigated. The results show that the surface boiling characteristics of superhydrophobic nanostructures are similar to those of membrane boiling. The boiling working medium is hard to infiltrate into the surface, and the boiling heat transfer coefficient and critical heat flux are low. The results show that solid-liquid contact at Cassie-Baxter state, nanostructured surface to the boiling medium heat supply efficiency is low, the superhydrophobic nano-structured surface boiling efficiency is the main reason.