The Effect of Nanoparticles Aggregation on Thermal Conductivity of Al2O3 /H2O Nanofluid

The constant thermophysical properties for nanofluids is a requisite for their application in industries. In this work, the stability of thermal conductivity of Al2O3 /H2O nanofluid was studied by considering particle size distribution applying dynamic light scattering (DLS). With elapsed time, thermal conductivity of nanofluid increases and reachs to a maximum value and then decreases. Increasing of concentration of Al2O3 nanoparticles in base fluid (H2O) raised the thermal conductivity, but nanoparticles agglomeration was occurred faster due to the presence of higher number of nanoparticles. The experimental data reveales the direct influence of nanoparticles agglomeration on the thermal conductivity of nanofluid.

کلیدواژه ها:

Al2O3 nanoparticles ، nanofluid ، thermal conductivity ، agglomeration