بررسی آزمایشگاهی حذف کروم (VI) از محلول های آبی با استفاده از کربن فعال اصلاح شده حاصله از میوه درخت کاج

This article reports an experimental study on the forced convective heat transfer and flow characteristics of a nanofluid consisting of deionized water and different volume concentration of γ-Al2O3 nanofluid (0.025, 0.05 and 0.1) flowing inside a horizontal shell and tube heat exchanger counter flow under transient and turbulent flow conditions are investigated. First, alumina nanoplate with the hydrothermal method was synthesized and then Analysis of the pattern of X-ray diffraction (XRD) and scanning electron microscope (SEM) on them were conducted. The γ-Al2O3/water nanofluid was produced by the tow-step synthesis method with cationic chitosan dispersant served as the experimental sample, and was dispersed into different volume concentrations. Particle size distributions for a range of nanofluids are measured by dynamic light scattering (DLS).The results indicate that the convective heat transfer coefficient of nanofluid is slightly higher than that of the base fluid at same mass flow rate and at same inlet temperature. The heat transfer coefficient increases by increasing the volume concentration of nanoparticles in nanofluid, also the heat transfer coefficient of the nanofluid increases with an incease in the mass flow rate.

کلیدواژه ها:

nanofluid ، heat transfer ، Alumina ، Reynolds number ، Convection