International Scientific Journal


This paper presents a numerical investigation of heat transfer augmentation using internal longitudinal ribs and γ-Al2O3/ water nanofluid in a stationary curved square duct. The flow is assumed 3D, steady, laminar, and incompressible with constant properties. Computations have been done by solving Navier-Stokes and energy equations utilizing finite volume method. Water has been selected as the base fluid and thermo- physical properties of γ- Al2o3/ water nanofluid have been calculated using available correlations in the literature. The effects of Dean number, rib size and particle volume fraction on the heat transfer coefficient and pressure drop have been examined. Results show that nanoparticles can increase the heat transfer coefficient considerably. For any fixed Dean number, relative heat transfer rate (The ratio of the heat transfer coefficient in case the of γ- Al2o3/ water nanofluid to the base fluid) increases as the particle volume fraction increases; however, the addition of nanoparticle to the base fluid is more useful for low Dean numbers. In the case of water flow, results indicate that the ratio of heat transfer rate of ribbed duct to smooth duct is nearly independent of Dean number. Noticeable heat transfer enhancement, compared to water flow in smooth duct, can be achieved when γ-Al2O3/ water nanofluid is used as the working fluid in ribbed duct.
PAPER REVISED: 2012-01-19
PAPER ACCEPTED: 2012-02-04
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THERMAL SCIENCE YEAR 2012, VOLUME 16, ISSUE Issue 2, PAGES [469 - 480]
  1. Ko, T.H., Numerical investigation on laminar forced convection and entropy generation in a curved rectangular duct with longitudinal ribs mounted on the heated wall, International Journal of Thermal Science, 45 (2006), pp. 390-404
  2. Chang, S. W., Lin, C.C., Liou, J.S., Heat transfer in a reciprocating curved square duct fitted with longitudinal ribs, International Journal of Thermal Sciences 47 (2008), pp. 52-67
  3. Papadopoulos, P.K., Hatzikonstantinou, P.M., Thermally developing flow in curved square ducts with internal fins, Heat and Mass Transfer, 42(2005), pp. 30-38
  4. Nobari,M.R.H., Gharali, K., A numerical study of flow and heat transfer in internally finned rotating straight pipes and stationary curved pipes, International Journal of Heat and Mass Transfer, 49 (2006), pp. 1185-1194
  5. Choi, S.U.S., et al., Anomalously thermal conductivity enhancement in nanotube suspensions, Applied Physics Letters 79 (2001), pp. 2252-2254
  6. Masuda, H., et al., Alteration of thermal conductivity and viscosity of liquid by dispersing ultrafine particles (Dispersion of g-Al2O3, SiO2, and TiO2 ultra-fine particles), Netsu Bussei, 7 (1993), pp. 227-233
  7. Lee, S., et al., Measuring thermal conductivity of fluids containing oxide nanoparticles, Journal of Heat Transfer. Transactions of ASME, (1999), pp. 280- 289
  8. Xuan, Y., Li,Q., Heat transfer enhancement of nanofluids, International Journal of Heat and Fluid Flow, 21 (2000), pp. 58-64
  9. Xuan,Y., Roetzel,W., Conceptions for heat transfer correlation of nanofluids, International Journal of Heat and Mass Transfer, 43 (2000), pp. 3701-3707
  10. Heris, S.Z., Esfahany, M.N., Etemad, G., Investigation of CuO/water nanofluid laminar convective heat transfer through a circular tube, Journal of Enhanced Heat Transfer, 13 (2006), pp. 279-289
  11. Nguyen, C.T., et al., Heat transfer enhancement using Al2O3-water nanofluid for an electronic liquid cooling system, Applied Thermal Engineering, 27 (2007), pp. 1501-1506
  12. Akbarinia, A., Behzadmehr, A., Numerical study of laminar mixed convection of a nanofluid in horizontal curved tubes, Applied Thermal Engineering, 27 (2007), pp. 1327-1337
  13. Wen, D., Ding, Y., Experimental investigation into convective heat transfer of nanofluids at the entrance region under laminar flow conditions, International Journal of Heat and Mass Transfer, 47 (2004), pp. 5181-5188
  14. Heris, S.Z., Esfahany, M.N., Etemad, G., Numerical investigation of nanofluid laminar convection heat transfer through a circular tube, Numerical Heat Transfer, 52 (11) (2007), A, pp. 1043-1058
  15. Gherasim, I., et al., Experimental investigation of nanofluids in confined laminar radial flows, International Journal of Thermal Sciences, 48 (2009), pp. 1486-1493
  16. Xuan,Y., Roetzel, W., Conceptions for heat transfer correlation of nanofluids, International Journal of Heat and Mass Transfer, 43(2000), pp. 3701-3707
  17. Pak, B.C., Cho, Y.I., Hydrodynamic and heat transfer study of dispersed fluids with submicron metallic oxide particles, Experimental Heat Transfer11, (1998),2, pp.151-170
  18. Wang, X., Xu, X., Choi, SUS. Thermal conductivity of nanoparticles-fluid mixture, Journal of Thermophysics and Heat Transfer 13, (1999), 17, 474-480
  19. Murshed, S.M.S., Leong, K.C., Yang, C., Thermophysical and electrokinetic properties of nanofluids - A critical review, Applied Thermal Engineering 28, (2008), pp. 2109-2125
  20. Kakaç, S., Pramuanjaroenkij, A., Review of convective heat transfer enhancement with nanofluids, International Journal of Heat and Mass Transfer 52, (2009), pp. 3187-3196
  21. Wang, X.Q., Mujumdar, A. S., Heat transfer characteristics of nanofluids: a review, International Journal of Thermal Sciences 46, (2007), pp. 1-19
  22. Murugesan, C., Sivan, S., Limits for thermal conductivity of nanofluids, THERMAL SCIENCE 14, (2010), pp. 65-71
  23. Patankar,S.V., Numerical Heat Transfer and Fluid Flow, Hemisphere Publishing Corporation, New York, 1980
  24. Hille, P., Vehrenkamp, R., Schulz- Bubois, E.O., The development and structure of primary and secondary flow in a curved square duct, Journal of Fluid Mechanics, 151 (1985), pp. 219-241

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