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Experimental investigation of specific heat of aqueous graphene oxide Al2O3 hybrid nanofluid

The specific heat of aqueous graphene+Al2O3(1:1)hybrid nanofluid was measured 
 using the cooling method. The influence of nanoparticle mass fraction and 
 temperature on the specific heat capacity of the hybrid nanofluids was 
 investigated, the specific heat of the hybrid nanofluid was compared with 
 that of aqueous grapheneoxide nanofluidand Al2O3nanofluid. Afitted formula 
 of the specific heat of the hybrid nanofluid was proposed based on the 
 experimental data. It indicates that the specific heat reduction ratio 
 increases with increase of nanoparticle fraction; the maximum reduction 
 ratio is 7% at 0.15wt% at 20°C. The mass fraction of nanoparticle affects the 
 specific heat of hybrid nanofluid more significantly at lower temperature. 
 Temperature impacts the specific heat more distinctly than the nanoparticle 
 fraction. The specific heat increases with temperature and the maximum 
 specific heat reduction ratio of the hybrid nanofluid diminishes from 7 % at 
 20°C to 2% at 70°C at the mass fraction of 0.05%.