Heat transfer enhancement effect of nanostructured surface made of carbon nanotube on SiC ceramics

Noguchi, Hiroki

Proceedings of 11th International Conference on Nanochannels, Microchannels, and Minichannels (ICNMM 2013) (CD-ROM), 5 Pages, 2013/06

With the aim of enhancing heat transfer in the SiC heat exchanger, a nanostructured surface made of carbon nanotubes was produced on a SiC substrate by surface decomposition. Two types of SiC, one produced by pressureless sintering and one by chemical vapor deposition (CVD-SiC), were used as substrates. In order to investigate surface wettability, nanostructured surfaces on the CVD-SiC with hydrophilicity and hydrophobicity were produced. The effects of heat transfer enhancement by the nanostructured surfaces were evaluated by a convective heat transfer test using de-ionized water. The nanostructured surface on the CVD-SiC with hydrophilicity was the only surface that showed any heat transfer enhancement. However, this enhancement was much smaller than those previously reported. The experiment showed that the small size of the nanopores influenced the heat transfer enhancement and that the wettability of the nanostructured surface was related to heat transfer enhancement.