Journal of Nanomaterials / 2015 / Article / Tab 1

Research Article

An Experimental Study on Heat Transfer and Pressure Drop of CuO-Water Nanofluid

Table 1

Experimental studies of water based CuO nanofluids.

AuthorBase fluidParticle materialVolume fraction (vol.%)Channel geometry and dimensionFlow regimeResults and remarks

Asirvatham et al. [18]WaterCuO0.003Copper tube 
: 1.5 m; ID: 8 mm
Laminar(i) The nanoparticles increased the heat transfer up to 8%
(ii) At the entrance region, the heat transfer enhancement increased and decreased with the increasing axial distance
(iii) As the temperature increased, the energy exchange of the nanoparticle-base fluid contact increased

Selvakumar and Suresh [19]WaterCuO0.1, 0.2Heat sink
55 × 55 × 75 mm
Turbulent(i) The interface temperature was reduced between the heater and water block
(ii) The heat transfer enhanced by the use of the nanoparticles in the base fluid; the maximum heat transfer enhancement was approximately 29%
(iii) The increase of the pressure drop was less than the increase in the convective heat transfer

Fotukian and Esfahany [8]WaterCuO0.039, 0.078, 0.118, 0.157, 0.236Circular tube 
: 1 m; OD: 32 mm; Thick: 5 mm
Turbulent(i) The nanoparticles concentration did not show much effect on heat transfer enhancement in turbulent regime
(ii) The ratio of convective heat transfer coefficient of nanofluid to that of pure water decreased with the increasing Reynolds number

Saeedinia et al. [20]OilCuO0.02, 0.5, 1, 2Circular tube 
: 1200 mm; OD: 15.8 mm; ID: 14 mm
Laminar(i) The suspended CuO nanoparticles increased the heat transfer, even for a low volume fraction
(ii) The maximum heat transfer enhancement of oil based nanofluid was approximately 12.7% at 2.0 vol.%

Pooyan Razi et al. [21]OilCuO0.2, 0.5, 1, 2Round copper tubes 
: 1200 mm; OD: 12.7 mm; Thick: 0.6 mm
Laminar(i) Remarkable heat transfer enhancement was observed as well as the pressure drop by the inclusion of the nanoscaled particles into the base fluid
(ii) As the tube profile became more flattened, the heat transfer enhancement increased, and the same behaviour was valid for the pressure drop
(iii) The maximum heat transfer enhancement was 26.4% at 2% vol. for the flattened tube compared to the pure oil.

: length of the test tube, OD: outer diameter, ID: inner diameter, and Thick: thickness.