Effects of SiO2/Water Nanofluid Flow in a Square Cross-Sectioned Curved Duct

Abstract

Forced convection SiO2/water nanofluid flow and heat transfer was numerically performed in 180-degree three-dimensional curved duct with square cross section under steady and laminar flow conditions in this investigation. Dean number was changed from 102 to 898. All surface of curved duct was exposed to uniform and constant heat flux. Nanoparticle volume fractions was ranged 1.0%-4.0%. The average Nusselt number and average Darcy friction factor were determined for each nanoparticle volume fractions. Velocity and temperature profiles and secondary flows were analyzed in detail. In addition, numerical study results are expressed with engineering correlations as changing average Nusselt number and average Darcy friction factor with Dean number and nanoparticle volume fraction.

Keywords

• Laminar flow,Dean number,SiO2/water nanofluid,square cross-sectioned curved duct,forced convection

Kaynakça

1. H. A. Mohammed, G. Bhaskaran, N. H. Shuaib, and R. Saidur, “Heat transfer and fluid flow characteristics in microchannels heat exchanger using nanofluids: A review,” Renewable and Sustainable Energy Rev., vol. 15, pp. 1502-1512, 2011.
2. S. U. S. Choi, “Enhancing thermal conductivity of fluids with nanoparticles”, in: D.A. Singer, H.P. Wang (Eds.), Development and Applications of Non- Newtonian Flows, ASME, New York, vol. 231 pp. 99-105, 1995.
3. S. Lee, S. U. S. Choi, S. Li, and J. A. Eastman, “Measuring thermal conductivity of fluids containing oxide nanoparticles,” Journal of Heat Transfer, vol. 121, pp. 280-288, 1999.
4. B. C. Pak and Y. I. Cho, “Hydrodynamic and heat transfer study of dispersed fluids with submicron metallic oxide particles,” Exp. Heat Transfer, vol. 11, pp. 151-170, 1998.
5. Y. Xuan and Q. Li, “Heat transfer enhancement of nanofluids,” Int. J. Heat Fluid Flow, vol. 21, pp. 58-64, 2000.
6. M. S. Islam and N. R. Mondal, “Effects of curvature on unsteady solutions through a curved square duct flow,” 5th BSME International Conference on Thermal Engineering, vol. 56, pp. 217-224, 2013.
7. J. Facao and A. C. Oliviera, “Modelling laminar heat transfer in a curved rectangular duct with computational fluid dynamics code,” J. Heat Transfer, vol. 48, pp. 165-177, 2005.
8. J. C. Sturgis and I. Mudawar, “Single-phase heat transfer enhancement in a curved, rectangular channel subjected to concave heating,” Int. J. Heat and Mass Transfer, vol. 42, pp. 1255-1272, 1999.

9. L. Fang, “Effects of geometries on heat transfer enhancement of thermal fluids in curved ducts,” Appl. Therm. Eng., vol. 90, pp. 590-595, 2015.
10. Akbarinia and A. Behzadmehr, “Numerical study of laminar mixed convection of a nanofluid in horizontal curved tubes”, Appl. Therm. Eng., vol. 207, pp. 1327-1337, 2007.
11. O. Ghaffari, A. Behzadmehr, and H. Ajam, “Turbulent mixed convection of a nanofluid in a horizontal curved tube using a two-phase approach,” Int. Commun. Heat and Mass Transfer, vol. 37, pp. 1551–1558, 2010.
12. W. H. Azmi, K. V. Sharma, P. K. Sarma, R. Mamat, and G. Najafi, “Heat transfer and friction factor of water based TiO2 and SiO2 nanofluids under turbulent flow in a tube,” Int. Commun. Heat and Mass Transfer, vol. 59, pp. 30-38, 2014.
13. A. N. Dravid, K. A. Smith and E. W. Merrill, “Effect of secondary fluid on laminar flow heat transfer in helical coiled tubes,” AICHE J., vol. 17, pp. 1114-1122, 1971.
14. C. E. Kalb and J. D. Seader, “Fully developed viscous-flow heat transfer in curved circular tubes with uniform wall temperature,” AICHE J., vol. 20, pp. 340-346, 1974.