Thermal Science 2012 Volume 16, Issue 2, Pages: 469-480
https://doi.org/10.2298/TSCI110719028S
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Numerical analysis of heat transfer enhancement with the use of γ-Al2O3/water nanofluid and longitudinal ribs in a curved duct
Soltanipour Hosseinali (Department of Mechanical Engineering, Urmia University of Technology, Urmia, Iran)
Choupani Parisa (Department of Mechanical Engineering, University of Tabriz, Tabriz, Iran)
Mirzaee Iraj (Department of Mechanical Engineering, Urmia University, Urmia, Iran)
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.
Keywords: curved duct, Dean number, laminar flow, heat transfer enhancement, particle volume fraction