Showing papers in "International Journal of Thermal Sciences in 2011"

TL;DR: In this article, the boundary layer flow induced in a nanofluid due to a linearly stretching sheet is studied numerically and the transport equations include the effects of Brownian motion and thermophoresis.

TL;DR: In this paper, the authors examined the natural convection in an enclosure that is filled with a water-Al2O3 nanofluid and is influenced by a magnetic field, based upon numerical predictions, the effects of pertinent parameters such as the Rayleigh number (103,≤,Ra,≤ 107), the solid volume fraction (0.06), and the Hartmann number ( 0.1), on the flow and temperature fields and the heat transfer performance of the enclosure were examined.

TL;DR: In this article, the thermal conductivity, viscosity, and stability of nanofluids containing multi-walled carbon nanotubes (MWCNTs) stabilized by cationic chitosan were studied.

TL;DR: Thermal rectification is a phenomenon in which thermal transport along a specific axis is dependent upon the sign of the temperature gradient or heat current as discussed by the authors, which offers improved thermal management of electronics as size scales continue to decrease.

TL;DR: In this paper, the viscosity of the stable nanofluids, prepared by dispersing 40-nm diameter spherical CuO nanoparticles in gear oil, was investigated.

TL;DR: In this article, a new analytical approach for the thermal analysis of ground source heat pumps (GSHPs) that considers axial and groundwater flow effects was developed, and compared with existing analytical solutions based on the finite and infinite line source theory is carried out.

TL;DR: In this paper, the authors proposed a center-cleared twisted tape aiming at acxhieving good thermohydraulic performance in laminar convective heat transfer, which is a widely used technique for heat transfer enhancement.

TL;DR: In this article, an experimental investigation has been conducted on the flow friction and heat transfer in sinusoidal microchannels with rectangular cross sections, and the experimental results, mainly the overall Nusselt number and friction factor, for wavy micro-channels are compared with those of straight baseline channels with the same cross section and footprint length.

TL;DR: In this paper, turbulent forced convection flow of water-Al2O3 nanofluid in a circular tube, subjected to a constant and uniform heat flux at the wall, is numerically analyzed.

TL;DR: In this paper, the authors investigated the effects of the nanoparticle volume fraction on the flow and heat transfer characteristics under the influence of thermal buoyancy and temperature dependent internal heat generation or absorption.

TL;DR: In this article, the double-diffusive natural convective boundary-layer flow of a nanofluid past a vertical plate is studied analytically, and a similarity solution is presented.

TL;DR: In this article, the steady two-dimensional boundary layer flow past a static or a moving wedge immersed in nanofluids is investigated numerically using an implicit finite difference scheme known as the Keller-box method and the NAG routine DO2HAF.

TL;DR: In this article, the authors compared CFD predictions of single-phase and three different two-phase models (volume of fluid, mixture, Eulerian) for laminar mixed convection of Al2O3-water nanofluids.

TL;DR: In this paper, a new technique was developed to directly grow Cu nanowire (CuNW) on Si substrate with electrochemical deposition to produce height-controlled hydrophilic nanowired surfaces for enhancing pool boiling performance.

TL;DR: In this article, heat transfer in flow between concentric rotating cylinders, also known as Taylor-Couette flows, constitutes a long-existing academic and industrial subject (in particular for electric motors cooling).

TL;DR: In this article, the effect of Brownian motion and thermophoresis on the boundary layer flow characteristics of a nanofluid over a vertical plate with a constant surface heat flux is investigated numerically, following a similarity analysis of the transport equations.

TL;DR: In this article, the problem of boundary layer flow of a nanofluid past a stretching sheet has been investigated analytically by using the homotopy analysis method, and an analytical solution is presented which depends on the Prandtl number Pr, Lewis number Le, Brownian motion number Nb and thermophoresis number Nt.

TL;DR: In this article, mathematical modeling is performed to simulate natural convection of Al 2 O 3 /water nanofluids in a vertical square enclosure using the lattice Boltzmann method (LBM).

TL;DR: In this article, an analytical study is carried out to examine the effect of thermal dispersion on the simulation of temperature plumes in aquifers that evolve from vertical ground source heat pump (GSHP) systems.

TL;DR: In this article, a simplified model for multi-component droplet heating and evaporation is generalised to take into account the coupling between droplets and the ambient gas, where the effects of interaction between the droplets are also considered, leading to noticeably better agreement between the predictions of the model and the experimentally observed average droplet temperatures.

TL;DR: In this article, a right-angle triangular enclosure with a flush mounted heater with finite size is placed on the left vertical wall, and the rest of walls are adiabatic.

TL;DR: In this article, the magnetohydrodynamic slip flow of an electrically conducting, viscoelastic fluid past a stretching surface is investigated and the main concern is to analytically investigate the structure of the solutions and determine the thresholds beyond which multiple solutions exist or the physical pure exponential type solution ceases to exist.

TL;DR: In this article, the performance of two same oscillating heat pipes (OHPs) charged with SiO 2 /water and Al 2 O 3 /water nanofluids, respectively, were investigated experimentally.

TL;DR: In this article, the most up-to-date thermodynamic properties of seawater, as needed to conduct an exergy analysis, are given as correlations and tabulated data, and the effect of the system properties as well as the environment dead state on the exergy and flow exergy variation is investigated.

TL;DR: In this paper, the effects of volumetric heat sources on natural convection heat transfer and flow structures in a wavy-walled enclosure are studied numerically, and the governing differential equations are solved by an accurate finite-volume method.

TL;DR: In this article, a simplified analytical model based on diamond-shaped unit cells has been developed to predict the heat transfer capability of a foamed channel, which is based on a structure of sphere-centered open-cell tetrakaidecahedron, similar to the actual microstructure of an aluminum metal foam.

TL;DR: In this article, the authors conducted flow boiling experiments on straight and expanding microchannels with similar dimensions and operating conditions and observed that the two-phase pressure drop across the expanding microchannel heat sink was significantly lower as compared to its straight counterpart.

TL;DR: In this article, a thermal lattice Boltzmann model is developed for the melting with natural convection in porous media at the representative elementary volume scale, and an evolution equation of the temperature distribution function is constructed through selecting the equilibrium distribution function and non-linear source term properly.

TL;DR: In this article, an analytical and numerical study of natural convection in a shallow rectangular cavity filled with nanofluids is presented, where analytical solutions for the stream function and temperature are obtained using a parallel flow approximation in the core region of the cavity and an integral form of the energy equation.

TL;DR: In this paper, three kinds of nanofluids were prepared by dispersing γ-Al2O3, CuO, and TiO2 nanoparticles in an aqueous solution of carboxymethyl cellulose (CMC).