Convection heat transfer of functionalized MWNT in aqueous fluids in laminar and turbulent flow at the entrance region

Abstract

It has long been recognized that the suspensions of solid particles in liquids provide useful advantages in industrial fluid systems, including heat transfer fluid, magnetic fluid, and lubricant fluid. However, those previous practical (micro and millimeter) tended to quickly settle down. In this study, nanofluid heat transfer research has been divided by fluid conditions of laminar flow and turbulent flow. We want to compare all parameter to measure convective heat transfer coefficients altogether in entrance region. The effect of some factors such as mass fraction, temperature, and various velocity were selected and the effects of these parameters on the convective heat transfer coefficients in the water based fluids are discussed. Distilled water and Multi-walled carbon nanotubes were used to produce nanofluids. Fig.1 shows respectively the SEM image of the sample. It can be seen that the nanotubes are entangled and some are in the format of agglomerates.