Numerical evaluation of laminar heat transfer enhancement in nanofluid flow in coiled square tubes
Open Access
- 9 May 2011
- journal article
- Published by Springer Science and Business Media LLC in Nanoscale Research Letters
- Vol. 6 (1), 376
- https://doi.org/10.1186/1556-276x-6-376
Abstract
Convective heat transfer can be enhanced by changing flow geometry and/or by enhancing thermal conductivity of the fluid. This study proposes simultaneous passive heat transfer enhancement by combining the geometry effect utilizing nanofluids inflow in coils. The two nanofluid suspensions examined in this study are: water-Al2O3 and water-CuO. The flow behavior and heat transfer performance of these nanofluid suspensions in various configurations of coiled square tubes, e.g., conical spiral, in-plane spiral, and helical spiral, are investigated and compared with those for water flowing in a straight tube. Laminar flow of a Newtonian nanofluid in coils made of square cross section tubes is simulated using computational fluid dynamics (CFD)approach, where the nanofluid properties are treated as functions of particle volumetric concentration and temperature. The results indicate that addition of small amounts of nanoparticles up to 1% improves significantly the heat transfer performance; however, further addition tends to deteriorate heat transfer performance.Keywords
This publication has 37 references indexed in Scilit:
- Nanofluids Research: Key IssuesNanoscale Research Letters, 2010
- Numerical study of fluid dynamic and heat transfer performance of Al2O3 and CuO nanofluids in the flat tubes of a radiatorInternational Journal of Heat and Fluid Flow, 2010
- Forced Convective Flow Drag and Heat Transfer Characteristics of CuO Nanoparticle Suspensions and Nanofluids in a Small TubeJournal of Enhanced Heat Transfer, 2010
- Investigating the diameter of solid particles effects on a laminar nanofluid flow in a curved tube using a two phase approachInternational Journal of Heat and Fluid Flow, 2009
- Review of convective heat transfer enhancement with nanofluidsInternational Journal of Heat and Mass Transfer, 2009
- Review of nanofluids for heat transfer applicationsParticuology, 2009
- Effect of particle size on the convective heat transfer in nanofluid in the developing regionInternational Journal of Heat and Mass Transfer, 2009
- Laminar convective heat transfer and viscous pressure loss of alumina–water and zirconia–water nanofluidsInternational Journal of Heat and Mass Transfer, 2008
- Numerical studies of a tube-in-tube helically coiled heat exchangerChemical Engineering and Processing - Process Intensification, 2008
- A Review on the Potential Applications of Curved Geometries in Process IndustryIndustrial & Engineering Chemistry Research, 2008