Showing papers in "International Journal of Heat and Fluid Flow in 2009"

TL;DR: In this article, the effect of inclination angle on convection heat transfer and fluid flow in a two-dimensional enclosure filled with Cu-nanofluid has been analyzed numerically.

TL;DR: In this paper, different viscosity and thermal conductivity models are used to evaluate heat transfer enhancement in horizontal annuli using variable properties of Al2O3-water nanofluid.

TL;DR: In this paper, the effects of bubble length, liquid slug length, and gravity on the liquid film thickness were investigated, and experimental correlation for the initial liquid-film thickness based on capillary number, Reynolds number, and Weber number was proposed.

TL;DR: In this paper, a two-phase closed thermosyphon (TPCT) was used for heat transfer in various input powers and the efficiency of the TPCT increased up to 14.7% when Al 2 O 3 /water nanofluid was used instead of pure water.

TL;DR: In this paper, the effect of the use of a nanofluid in a miniature plate heat exchanger (PHE) with modulated surface has been studied both experimentally and numerically.

TL;DR: In this paper, an analysis of fully developed channel flow at Reynolds number of Re = u τ δ / ν = 4000 based on the friction velocity, u τ, and half the channel height, δ.

TL;DR: In this article, a coupling methodology between an upstream Reynolds Averaged Navier-Stokes (RANS) simulation and a large eddy simulation (LES) further downstream is presented.

TL;DR: In this article, the authors report the results of their numerical studies on laminar mixed convection heat transfer in a circular curved tube with a nanofluid consisting of water and 1 ǫvol% Al 2 O 3.

TL;DR: In this article, the authors studied mixed convection heat transfer characteristics for a lid-driven air flow within a square enclosure having a circular body and found that the most effective parameter on flow field and temperature distribution is the orientation of the moving lid.

TL;DR: In this paper, the influence of nozzle geometry on cavitation and near-nozzle spray behavior under liquid pressurized ambient is studied using a special nearnozzle field visualization technique, using a test rig pressurized with fuel.

TL;DR: In this article, a series of experiments have been carried out to investigate pressure and temperature oscillations during the flow boiling instabilities under uniform heating, using water as a cooling liquid, using thin nickel film thermometers, integrated on the back side of a heat sink with microchannels, to obtain a better insight related to temperature fluctuations caused by two-phase flow instabilities.

TL;DR: In this article, a numerical analysis of three-dimensional fluid flow and convective heat transfer from an array of solid and perforated fins that are mounted on a flat plate is presented.

TL;DR: In this article, the authors presented a model for calculation of the frictional pressure gradient during condensation or adiabatic liquid-gas flow inside minichannels with different surface roughness.

TL;DR: In this article, the effect of double-diffusive natural convection of water in a partially heated enclosure with Soret and Dufour coefficients around the density maximum is studied numerically.

TL;DR: In this article, a vibrating surface, driven by an electromagnetic turbulator, was mounted in a flat plate to excite the Tollmien-Schlichting waves, which were amplified by an adverse pressure gradient induced by an insert on the upper wall of the test section.

TL;DR: In this article, the authors describe a coupling strategy of a large-eddy simulation (LES) solver and a heat transfer code within solids on parallel architectures for turbulent flow problems.

TL;DR: In this article, the effects of fuel temperatures and ambient gas conditions on the spray-atomization behavior of soybean oil methyl ester (SME) fuel were analyzed through spray parameters such as the axial distance from the nozzle tip, local and overall Sauter mean diameter (SMD).

TL;DR: Hybrid large-eddy type simulations for chevron nozzle jet flows are performed at Mach 0.9 and Re = 1.03 × 106 in this paper, where a Reynolds-averaged Navier-Stokes (RANS) solution is patched into the near wall region.

TL;DR: The spray atomization characteristics of an undiluted biodiesel fuel (soybean oil methyl ester, SME) in a diesel engine were investigated and compared with that of diesel fuel (ultra low sulfur diesel, ULSD).

TL;DR: In this paper, a roughness extension for k-π turbulence models is proposed to account for surface roughness for transitionally and fully rough surfaces, which is based on the equivalent sand grain approach and accounts for theoretical considerations on the log-layer solution.

TL;DR: In this article, the authors investigated the spray characteristics and atomization performance of gasoline fuel (G100), bioethanol fuel (E100), and bio-ethanol blended gasoline (E85) in a direct injection gasoline injector in a gasoline engine.

TL;DR: In this paper, surface tension-driven effects in wickless heat pipes with aqueous solutions of long-chain alcohols are investigated, showing the potential advantages of self-rewetting fluids, i.e. liquid solutions with a non-linear dependence of the surface tension with temperature.

TL;DR: In this article, an air-lift pump was designed and tested for nine submergence ratios and three risers of different lengths with different air injection pressures, and the results showed that the pump capacity and efficiency are functions of the air mass flow rate, submergence ratio and riser pipe length.

TL;DR: In this article, a computational fluid dynamics (CFD) modeling of airflow within plant canopies using 3D canopy architecture was developed to understand the effect of the canopy to airflow.

TL;DR: In this paper, a new correlation was proposed for the estimation of minimum liquid film flow rate at the maximum entrainment fraction condition, which successfully predicted the newly collected air-water and Freon-113 entraining fraction data.

TL;DR: In this paper, the effects of injection system parameters, such as the frequency of injection, pulse duration, initial wall temperature, pressure of injection and impingement distance, on the performance of an intermittent spray cooling system were investigated.

TL;DR: In this paper, the three-dimensional wake flow behind a flat plate placed normal to the free stream has been investigated by means of direct numerical simulations and the Reynolds number Re based on the homogeneous inflow velocity and the uniform width d of the plate was 750.

TL;DR: In this paper, the effects of the Reynolds and Prandtl numbers on higher-order turbulence statistics such as a turbulent prandtl number and the budget for the dissipation rate of the temperature variance are investigated.

TL;DR: In this paper, Liu et al. investigated the performance of unsteady Reynolds-averaged Navier-Stokes (URANS) computation and various versions of detached eddy simulation (DES) in resolving coherent structures in turbulent flow around two cubes mounted in tandem on a flat plate at Reynolds number (Re) of 22,000 and for a thin incoming boundary layer.

TL;DR: In this paper, Menter et al. presented mathematical expressions for two significant parameters which control the onset location and length of transition in the γ-Reθ transition model of general purpose CFD codes.