Experimental Investigation On Fabrication And Boiling Heat Thansfer Characteristics Of Nanostructured Macroporous Surface

The porous surface structure is a highly efficient heat transfer enhancement, it can effectively improve the heat transfer performance, and significantly improve energy efficiency.Experimental research and exploration were done and finally the optimal experimental approach for electrodeposition was found to got the nanostructured macroporous surfaces, and it is proved that porous surfaces with relatively stable size of the main particle can be obtained using this method.The influence of experimental conditions, such as electroplating current, electroplating time, and with or without surfactant, to the porous layer was analyzed and compared qualitatively. These experimental conditions impact the structure and characteristic parameters of the nanostructured macroporous surfaces markedly.Pool boiling tests were performed in water, in order to assess the influence of surface features on boiling. It's been proved that characteristic parameters would evidently affect the boiling heat transfer performance of the nanostructured macroporous surfaces. The superheat can be mostly reduced about 13℃at the same heat flux, and the heat transfer coefficient of the nanostructured macroporous surfaces can be enhanced up to about 1.7 times that of the smooth surface, and while at the same superheat, it can be enhanced up to about 3.2 times. The critical heat flux of the smooth surface and one nanostructured macroporous surface was tested respectively. The results show that the critical heat flux of smooth surface is about 178W/cm2, and for the porous surface sample it is about 292W/cm2. It was a noticeable enhancement, up to about 1.64 times of the smooth surface sample.