Laminar Convective Heat Transfer in Developing Region of a Pipe by Using Nanofluids

摘要

A numerical study of convective heat transfer in the developing region of a pipe for laminar flow using nanofluids is presented. The finite volume method is used to solve the transport equations for the mass, momentum and energy adopting a single phase approach. Four nanoparticles (Al_2O_3, CuO, SiC and TiO_2) with different volume fraction (1% - 5%) mixing with the base fluid water are considered. The heat transfer is analyzed for a range of Reynolds number from 100 to 1000 at a constant heat flux 500 W/m~2 at the pipe wall. The result revels that for a constant Reynolds number the Nusselt number and heat transfer coefficient are decreased continuously in the developing region to a constant value that of fully developed value. The heat transfer enhancement for nanofluids is increasing with the increment of volume fraction compared to pure water at both developed as well as the developing region and Al_2O_3-H_2O nanofluids shows the highest enhancement compared to others.