Investigation of thermophysical properties and rheology of iron-silver-copper metal oxide hybrid nanoparticles based on carbon structure of quantum dots for use in heat transfer systems with turbulent flow regime

Subject Areas :

Hamid Mousavi ¹ (Head of study department)
, Seyed Mostafa Tabatabaee Ghomshe ² (. Department of Chemical Engineering, Mahshar Branch, Islamic Azad University, Mahshahr)
Alimorad rashidi ³ (head of carbon group)
Masoumeh Mirzaei ⁴ (Department of Chemical Engineering, Mahshar Branch, Islamic Azad University, Mahshahr)

Received: 2021-04-19 Accepted : 2021-08-24 Published : 2022-08-23

Keywords: Thermal conductivity, Nanohybrid, Carbon quantum dot base fluids, heat transfer coefficient-,

Abstract :

In this work, nano-hybrids of iron-carbon quantum dots, silver-carbon quantum dots, and copper– carbon quantum dots were synthesized and prepared by a wet chemical method. After examining their thermal and thermophysical properties, the thermal conductivity (k) was measured and the heat transfer coefficient (h) for turbulent flow was compared. The synthesized samples were characterized with Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), tunneling electron microscopy (TEM), and scanning electron microscopy (SEM). Zeta, and dynamic light scattering (DLS) stability tests were also performed for the synthesized samples. The prepared carbon quantum dots and hybridized-iron, silver, and copper samples were distributed in the base fluid (water) by ultrasonic probe device. Viscosity and density were examined as a measure of nanoparticle concentration and temperature. Also, the heat capacity of synthesized nanoparticles was measured at different temperatures, but the changes in density and heat capacity at low concentrations of nanoparticles were not significant. Then the thermal conductivity (k) and the heat transfer coefficient (h) were measured to improve the heat transfer by the synthesized nanoparticles. The synthesized nanoparticles were prepared and analyzed for three different concentrations of 0.05, 0.1, and 0.5 wt. %. The greatest improvement in thermal conductivity 25 % at a concentration 0.5 wt. % and 45 °C was for hybridized copper nanoparticles-carbon quantum dots. Also, the highest improvement in heat transfer coefficient (h) was reported in Reynolds number 15529 for silver nanoparticles-carbon quantum dots improvement was about 29 %. In addition, copper nanoparticles-carbon quantum dots with a 20 % improvement in transfer heat transfer coefficient reported.

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