In this letter, we have presented an experimental investigation of the specific heat of water-based nanofluid with a differential scanning calorimeter. The result indicates that the specific heat of nanofluid decreases gradually as the nanoparticle volume fraction increases from 0.0% to 21.7%. The relationship between them exhibits good agreement with the prediction from the thermal equilibrium model [Eq. (2)]. The other simple mixing model [Eq. (1)] fails to predict the specific heat of nanofluid.
The density of nanoparticle is provided by Nanophase Technologies Inc.