Heat-transfer characteristics of a non-newtonian Au nanofluid in a cubical enclosure with differentially heated side wallsTernik, Primož (Avtor) Rudolf, Rebeka (Avtor) Žunič, Zoran (Avtor) , Inštitut za kovinske materiale in tehnologije (Lastnik avtorskih pravic) natural convectionCMC-Au nanofluidheat transferNusslet numberThe present work deals with the laminar natural convection in a cubical cavity filled with a homogenous aqueous solution of carboxymethyl cellulose (CMC) based gold (Au) nanofluid obeying the power-law rheological model. The cavity is heated on the vertical and cooled from the adjacent wall, while the other walls are adiabatic. The governing differential equations were solved with the standard finite-volume method and the hydrodynamic and thermal fields are coupled using the Boussinesq approximation. The main objective of this study is to investigate the influence of the nanoparticle volume fraction on the heat-transfer characteristics of CMC-based Au nanofluid over a wide range of the base-fluid Rayleigh number. Accurate numerical results are presented in the form of dimensionless temperature and velocity variations, the mean Nusselt number and the heat-transfer rate. It is shown that adding nanoparticles to the base fluid delays the onset of natural convection. In addition, numerical simulations showed that, just after the onset of natural convection, adding nanoparticles reduces the mean Nusselt number value for any given base-fluid Rayleigh number.20152017-03-16 13:31:38Znanstveno delo65190ISSN: 1580-2949UDK: 519.61/.64:536.2:620.3OceCobissID: 106193664COBISS_ID: 18404374ISSN pri članku: 1580-2949NUK URN: URN:SI:UM:DK:H2ZYINSPsl