| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 4992744 | Experimental Thermal and Fluid Science | 2017 | 36 Pages |
Abstract
Laminar flow hydrodynamic characteristics of alumina based nanofluids (0-2.5Â vol.%) flowing through straight tubes and helical coils with different combinations of curvature and pitch ratio have been studied. Two types of glycol-water based mixtures, ethylene glycol/water (EG/W) and propylene glycol/water (PG/W) in 60:40Â wt ratio, were used as the base fluids. The friction factor of nanofluids was found to be higher than that of the base fluids for both the straight tube as well as helical coil geometry, which further increased with increase in nanoparticle volume concentration. At the same Reynolds number, friction factor increased with nanoparticle concentration in the base fluid, which could be due to the presence of Brownian motion and increased collision rate of nanoparticles. Two new correlations to predict the friction factor for the laminar flow of alumina nanofluids through straight tubes and helical coils have been proposed.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
Puja Sharma, Ritu Gupta, Ravinder Kumar Wanchoo,