나노 구조체 패턴에 따른 열전달 성능에 대한 연구

It has been studied to improve heat transfer performance by using heat transfer surfaces with various roughness. And studies have been accomplished to improve the heat transfer performance by processing a heat transfer surface or a fin having a micro size. As a result of these studies, the heat transfer tube, which is mechanically form various pins or pores, is often used in the heat transfer system. However, there is a limit to improving the heat transfer performance using only the mechanical method. Therefore, in this study, we investigated to the heat transfer performance of coating nanostructure with various shapes and patterns on the heat transfer surface. And, it has been carried out that the experiment about durability of nano-structure added adhesive. Also, after finished experiment, we have measured the contact angle and surface roughness for analyzing the change of durability. As a result of measurement of the heat transfer performance on the heat transfer surface on which the carbon nanotube nanostructure with the dot pattern is formed, the heat transfer coefficient generally increased as compared with the heat transfer surface without the nanostructure, and the increase rate of the heat transfer coefficient decreases exponentially. It was confirmed that the increase rate of the heat transfer coefficient averagely increased by 5.81% after 100 kW / m². Therefore, these results suggest that heat transfer performance can be improved by forming a nanostructure on the heat transfer surface of the heat exchanger.