Modeling and Simulation of Unsteady Forced Convection Heat Transfer for Water/Al2O3 Nanofluid in Cylindrical Duct

Abstract

The flow field, heat transfer and forced convection heat transfer for the Al2O3-water nanofluid in a cylindrical Duct were numerically studied. Certain boundary conditions using a numerical method were used to solve the governing equations. The effect of different volumes of the volume fraction of nanoparticles Al2O3 on the flow and heat transfer of Al2O3-water nanofluid in a cylindrical Duct in a developed and unstable flow regime under convection heat transfer conditions with constant temperature boundary condition were numerically investigated. The resulted nanofluid was modeled using homogeneous mixture model relationships assuming the distribution of nanoparticles in water is homogeneous. The constant temperature condition and at the outlet cross-section, the velocity and temperature profile development condition was used in the Duct walls. The profile of velocity and temperature is assumed to be uniform and constant at the input stage. The present study was carried out aimed to study the variations of the parameters of flow and heat transfer of water/ aluminum oxide nanofluids due to the use of volume fraction, Reynolds Number and different inlet temperature of nanofluid. According to the results, increasing the Reynolds number of the flow and the fluid velocity and the inlet temperature of the nanofluid increases the heat transfer.