| Penulis/Author |
Dr. Ir. Suhanan, DEA. (1) ; Prof. Ir. Samsul Kamal, M.Sc., Ph.D (2); Dr.Eng. Yosephus Ardean Kurnianto Prayitno, S.T., M.Eng. (3); Ardi Wiranata, S.T., M. Eng., Ph.D (4) |
| Abstrak/Abstract |
Experimental study on thermophysical properties of nanofluids TiO2/TermoXT-32 had been carried out. The purpose of this experiment is to enhance the thermophysical properties of nanofluids as working fluid on the heat exchanger systems. The stability, thermal conductivity and dynamic viscosity of the nanofluids were observed by several tests, such as Transmission Electron Microscope (TEM), X-ray Diffractometer (XRD), and UV-visible spectrophotometer. The volume fraction of nanofluids was divided into three fractions, which are 0.1vol.%, 0.3vol.% and 0.5vol.%. As the results, the nano particle TiO2 had a rounded shape with diameter 20 nm and consists of aggregation. Based on the XRD test, the diffraction pattern confirmed that for all 2? peaks angle of nano particle TiO2 had an anatase structure. It showed that the anatase titania was well dispersed on the base fluids and gave a good stability. Moreover, the dynamic viscosity distribution was observed as the inverse function of temperature. On the other way, it was observed as linear function of volume fraction (nano particle concentration). However, the thermal conductivity was decreasing as the increase of concentration of nano particle due to the sedimentation of the nano fluid during the experiment. These observations then compared to the empirical method that used by former researchers and gave a good agreement. |
