“…For water-CuO (Bianco et al, 2009) concluded that single phase and two phase methods revealed approximated results, especially in the case of using temperature dependent properties. Demir (Demir et al, 2011) mentioned that although the nanofluid is actually a two-phase fluid in nature, the results show that the nanofluid behaves more like a pure fluid than a liquid-solid mixture. Kumar (Kumar, 2011) after validation his numerical study with experimental works, he emphasized single phase approach does not predict heat transfer coefficient as accurately as in the turbulent regime.…”