Effect of Dispersed Nanoparticles on Thermophysical Properties of Nanofluid and Heat Transfer Coefficients

Document Type : Special Issue Manuscripts

Authors

1 East Tehran Branch, Islamic Azad University,

2 unspecified

3 Department of Mechanical Engineering, West Tehran Branch, Islamic Azad University, Tehran, Iran

4 Department of Mechanical and Aeronautical Engineering, Clarkson University, Potsdam NY, 13699, USA

10.36884/jafm.9.SI1.25817

Abstract

In this investigation, effects of dispersed Cu nanoparticles in water on heat transfer coefficients are studied using Eulerian-Lagranigian approach. Nanoparticles disperse in the fluid due to drag, weight and Brownian forces acting on them. A new particle search algorithm is used to trace the particles in every time step. Thermal coupling between dispersed and carrier phases is done and also thermal and momentum interaction between particles and solid walls are taken onto account to obtain velocity and temperature fields. The specific heat of nanofluid is obtained using conventional models. The results show that regarding thermophysical properties of particles and base fluid, and also other conditions like mass flow rate and particle size, degradation or intensification of heat transfer coefficients can occur.

Keywords