EXPERIMENTAL STUDY OF THERMAL HYDRAULIC PERFORMANCE OF MULTI-WALLED CARBON NANOTUBES DISPERSED IN WATER IN SINGLE-PHASE FLOW

Enio Pedone Bandarra Filho¹; Edwin Martin Cárdenas Contreras¹; Abdul Orlando Cárdenas Gómes¹

¹ UFU

doi:10.20906/CPS/COB-2015-2735

Resumo

This paper deals on thermal-hydraulic performance of multi-walled carbon nanotube (MWCNT) nanoparticles dispersed in distilled water in single-phase flow in a horizontal tube. An experimental facility was built to verify the convective heat transfer coefficient in the transition and turbulent flows as well as the pressure drop. The tests were performed while maintaining constant input temperatures in the section varying from 10 to 20°C, whereas the constant heat flux applied on the wall varied between 10 and 18 kW/m2 and the mass flow rate varied between 20 and 100 g/s. The nanofluids were tested at volume concentrations that varied between 0.12% and 0.24%, where the nanoparticles had distinct aspect ratios of 100, 600, and 2400, respectively. The experimental heat transfer coefficient was evaluated as a function of mass velocity, G, and Reynolds number, where significant differences were observed. Regarding the pressure drop, the nanofluids exhibited pressure drops between 5 and 8.7% greater than that of the base fluid. Finally, a parameter was proposed to evaluate the obtained results, which relates the increase in heat transfer as a function of pumping power.

Palavras-chave: Nanofluid; Nanoparticle; Carbon Nanotube; Heat Transfer; Single-phase flow