Experimental investigation on the thermal performance of ultra-stable kerosene-based MWCNTs and Graphene nanofluids

Askari, S ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1016/j.icheatmasstransfer.2019.104334
  3. Publisher: Elsevier Ltd , 2019
  4. Abstract:
  5. A simple chemisorption method was used to graft on the surface of MWCNTs and Graphene nanoparticles to prepare stable kerosene-based MWCNTs and Graphene nanofluids. The prepared nanofluids remained stable for more than five months and no sedimentation was observed. Regarding the effect of temperature on thermo-physical properties, it was observed that although increasing nanoparticle concentration led to an increase in the fluid viscosity, it was negligible enough at lower nanoparticle loading. Moreover, adding nanoparticles to the base fluid did not have any noticeable impact on the fluid density which was negligible even at high concentrations. The thermal conductivity improvement was examined in the temperature range of 20–60 °C and particle loading of 0.05–0.5 wt%, the results revealed 28 and 23% enhancement for MWCNTs and Graphene nanofluids at 60 °C and 0.5 wt%. The experimental setup was designed to examine the convective heat transfer (Reynolds 2100-4450). The maximum enhancement was obtained at Reynolds number of 4448 and0.5 wt% for MWCNTs (40.26%) and Graphene (22.79%). To find out an optimum working condition, the maximum performance index was determined, the highest one (1.17) was observed for MWCNTs nanofluid at a concentration of 0.1%. © 2019 Elsevier Ltd
  6. Keywords:
  7. Graphene ; Kerosene ; MWCNTs ; Nanofluid ; Heat convection ; Heat transfer ; Multiwalled carbon nanotubes (MWCN) ; Nanoparticles ; Reynolds number ; Thermal conductivity ; Convective heat transfer ; Experimental investigations ; Nanofluids ; Nanoparticle concentrations ; Optimum working conditions ; Thermo-physical property ; Ultra-stable ; Nanofluidics
  8. Source: International Communications in Heat and Mass Transfer ; Volume 108 , 2019 ; 07351933 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0026271419303191