Jung Chang Wang
National Taiwan Ocean University, Taiwan
Title: Thermal energy storage of alumina nanofluids using innovation dimensional analysis
Biography
Biography: Jung Chang Wang
Abstract
A two-step synthesis preparing the thermoelectric nanofluids through an ultrasound technique was studied in the present article. The best mixing method was determined by a sedimentation experiment of suspendibility, stability, and thermal conductivity. 0.5-2.5 wt.% concentration thermoelectric nanofluids were added into a battery cell with copper and aluminum electrodes for an oxidation reduction reaction to test the generating capacity between 20 and 40°C. Two empirical formulas of thermal conductivity and generating capacity for thermoelectric nanofluids were derived by the innovation dimensional analysis. The results of the property verification and experimentation indicated that thermoelectric nanofluid and emulsifying agent mixture at a concentration of 1 wt.% had the best thermal conductivity, and that this decreases as the concentration increases. At 40°C, 2.5 wt.% thermoelectric nanofluid also had the highest electric charge density; however, the rate of increase was less than 7% higher than that for 2 wt.% thermoelectric nanofluid. The results also indicated that for 0.5-2.5 wt.% thermoelectric nanofluid between 20-40°C, inserting the temperature and concentration parameters can estimate the thermal conductivity and the electric charge density using the empirical formulas in the present study.