Abstract
Nanofluids (NFs) are nanotechnology-based colloidal suspensions fabricated by suspending nanoparticles (NPs) in a base liquid. These fluids have shown potential to improve the heat transfer properties of conventional heat transfer fluids. In this study we report in detail on fabrication, characterization and thermo-physical property evaluation of SiC NFs, prepared using SiC NPs with different crystal structures, for heat transfer applications. For this purpose, a series of SiC NFs containing SiC NPs with different crystal structure (α-SiC and β-SiC) were fabricated in a water (W)/ethylene glycol (EG) mixture (50/50 wt% ratio). Physicochemical properties of NPs/NFs were characterized by using various techniques, such as powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fouriertransform infrared spectroscopy (FTIR), dynamic light scattering (DLS) and Zeta potential analysis. Thermo-physical properties including thermal conductivity (TC) and viscosity for NFs containing SiC particles (α- and β- phase) weremeasured. The results show among all suspensions NFs fabricated with α-SiC particles have more favorable thermo-physical properties compared to the NFs fabricated with β-SiC.The observed difference is attributed to combination of several factors, including crystal structure (β- vs. α-), sample purity, and residual chemicals exhibited on SiCNFs. A TC enhancement of ∼20% while 14% increased viscosity were obtained for NFs containing 9 wt% of particular type of α-SiC NPs indicating promising capability of this kind of NFs for further heat transfer characteristics investigation.
Highlights
Heat transfer fluids are involved in many industrial processes to remove excess heat
We presented on the fabrication and evaluation of highly stable SiCNFs for heat transfer applications
The NFs were prepared by dispersing SiCparticles with different crystal structure in W/ethylene glycol (EG) base liquid, using colloidal stabilization strategies
Summary
Heat transfer fluids are involved in many industrial processes to remove excess heat. Reported that the effective TC of suspensions containing suspended nanoparticles (NPs) can be higher than those of normally used industrial heat transfer liquids. Such kind of new fluids, called as nanofluids (NFs), is a new class of dispersions containing nano-sized solid particles (NPs) dispersed in conventional heat transfer fluids as base liquid [7]; and are considered to be new enhanced heat transfer fluids, since they might offer appealing possibilities due to their improved heat transfer performance [10,11,12,13,14]. In the one-step method [10,15], NPs are directly prepared in the base liquid, forming the NFs in a combined process. Availability of NPs from commercial sources and different suppliers has attractedresearchers to this method, since they can have several choices for a certain nanoparticle, which allow effective and comparative research
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