Two phase numerical analysis of graphite nanoparticle in circular pipe

Abstract

Two-phase Mixture model is used to study the heat transfer characteristics of Al2O3 and Graphite nanoparticles. A horizontal circular pipe is analyzed under a laminar regime for different Reynolds numbers. The nanoparticle concentration is varied as 0.6%, 1%, and 1.6% volumetric concentration with water as base fluid. Three different Heat fluxes (2000, 16000, 30000 W/m2) are studied under these conditions. With the increase in heat flux, the wall temperature, and the fluid temperature increase. Local Nusselt number is calculated at x=0.3 m by using the heat transfer coefficient, which is in turn, calculated by finding wall temperature and fluid temperature. It can be seen that Graphite performs better than Al2O3 and the effectiveness increases with an increase in concentration and Reynolds number with the Local Nusselt number of Graphite being 137% higher than Al2O3 for Re=1900, 1.6%, x=0.3 m concentration.