Showing papers in "International Journal of Heat and Fluid Flow in 2011"

TL;DR: In this paper, an Eulerian two-fluid model is considered to simulate the nanofluid flow inside the microchannel and the governing mass, momentum and energy equations for both phases are solved using the finite volume method.

TL;DR: In this paper, the authors investigated the stability of double-diffusive convection for viscoelastic fluid with Soret effect in a porous medium using a modified-Maxwell-Darcy model.

TL;DR: In this article, the authors employed the dynamic mode decomposition method to analyze self-sustained oscillations in a cavity and found that the hydrodynamic resonances that gave rise to the self-ustained resonances occurred if the upcoming boundary layer structures and the shear layer structures coincided, not only in frequencies, but also in wavenumbers.

TL;DR: In this article, a parametric study of adverse pressure gradient turbulent boundary layers is presented, where the authors restrict their attention to the pressure gradient parameter, β, the Reynolds number and the acceleration parameter, K. The results show that the mean velocity profile in strong pressure gradient boundary layers does not conform to the classical logarithmic law.

TL;DR: In this article, the convective heat transfer of SiO2/water colloidal suspensions was investigated experimentally in a flow loop with a horizontal tube test section whose wall temperature was imposed.

TL;DR: In this paper, the onset of double-diffusive convection in a horizontal layer of a nanofluid is studied analytically and the stability boundaries for both non-oscillatory and oscillatory cases have been approximated by simple analytical expressions.

TL;DR: In this article, an experimental investigation of turbulent heat transfer in vertical upward and downward supercritical CO2 flow was conducted in a circular tube with an inner diameter of 4.5mm.

TL;DR: In this article, the authors considered algebraic turbulence modeling in adiabatic and evaporating annular two-phase flow, focusing in particular on momentum and heat transfer (so-called "convective boiling") through the annular liquid film.

TL;DR: In this article, the authors investigated the convective heat transfer of nanofluids in horizontal enclosures heated from below and found that the optimal volume fraction has a peak at a definite value of the Rayleigh number of the base fluid, that depends on both the average temperature of the nanophase and the diameter of the suspended nanoparticles.

TL;DR: In this paper, the authors evaluated the effects of geometric variables of a laidback fan-shaped hole on the film cooling effectiveness using a Reynolds-averaged Navier-Stokes analysis, and to optimize the shape of the hole using the Kriging meta-modeling technique.

TL;DR: In this paper, the authors developed an algorithm to use the Lattice Boltzmann method for solving free surface thermal flow problems with solid/liquid phase changes, where a multi-distribution function model is applied to simulate hydrodynamic flow and the coupled thermal diffusion-convection problem.

TL;DR: In this article, the flow structures, form drag coefficients and vortex shedding characteristics behind a single square cylinder and two side-by-side cylinders in an open-loop wind tunnel were measured and calculated using a pressure transducer and a hot-wire anemometer.

TL;DR: In this article, a coupled experimental/numerical analysis of turbulent flow past a square cylinder is performed at the ERCOFTAC Reynolds number Re = U∞D/ν = 21,400, where Re is the inflow velocity and D the cylinder height.

TL;DR: In this article, the authors studied the numerical modeling of fluid flow and heat transfer in a Taylor-Couette-Poiseuille system with axial flow and axial thoughflow.

TL;DR: In this article, the mean and fluctuating forces on an NACA0012 airfoil over a large range of angle ( α ) of attack (0−90°) and low to small chord Reynolds numbers ( Re c ), 5.3

TL;DR: In this article, a series of experiments were performed in order to investigate an effect of a helical wire on heat transfer to upwardly flowing CO 2 in a electrically-heated circular tube with an inner diameter of 6.32mm.

TL;DR: In this paper, a low Reynolds number (LRN) formulation based on the Partially Averaged Navier-Stokes (PANS) modelling method is presented, which incorporates improved asymptotic representation in near-wall turbulence modelling.

TL;DR: In this article, the radial and axial flow regime development in adiabatic upward air-water two-phase flow in a vertical annulus has been investigated using conductivity probes and neural networks techniques.

TL;DR: In this paper, an experimental investigation of flow structures downstream of a circular cylinder and a sphere immersed in a free-stream flow is performed for Re = 5000 and 10,000 using qualitative and quantitative flow visualization techniques.

TL;DR: In this paper, the authors present the heat transfer coefficients obtained in a 12.7 mm silicon evaporator composed of 135 microchannels with 85 mu m wide and 560 mu m high channels separated by 46 m m wide fins.

TL;DR: In this article, a numerical methodology was presented to simulate high pressure diesel spraying using the Eulerian-Lagrangian approach, where specific sub-models were developed to describe the liquid spray injection and breakup, and the influence of the liquid jet on the turbulence viscosity in the vicinity of the nozzle.

TL;DR: In this article, Wang et al. performed direct numerical simulations of a turbulent boundary layer (TBL) to investigate the spatial development of its turbulence characteristics and provided a useful database for the turbulence statistics of TBLs.

TL;DR: In this paper, the influence of flow regime (laminar, transition or turbulent) on the internal flow behavior, and how it affects the spray development in diesel nozzles is investigated.

TL;DR: In this article, a numerical study over a nominally two-dimensional circulation control airfoil is performed using a large-eddy simulation code and two Reynolds-averaged Navier-Stokes codes.

TL;DR: In this paper, the velocity field and wall heat transfer distributions for internal flows in the presence of longitudinal vortices have been experimentally investigated using a transient method based on temperature measurement with thermochromic liquid crystals.

TL;DR: In this paper, the effect of magnetic field on the combined buoyancy and surface tension driven convection in a cylindrical annular enclosure is studied. And the results reveal that, in tall cavities, the axial magnetic field suppresses the surface tension flow more effectively than the radial magnetic field.

TL;DR: In this article, the effects of nozzle shape and spray pressure on the liquid sheet characteristics were investigated for four nozzles with different exit widths (10, 15, 20 and 25 mm) and the length of liquid sheet breakup, liquid sheet velocity and the size of formed droplets were measured by a digital high speed camera.

TL;DR: In this paper, the surface drag was approached by a new correlation inside the algebraic interfacial area density (AIAD) model, which allows the detection of the morphological form of the two phase flow and the corresponding switching via a blending function of each correlation from one object pair to another.

TL;DR: In this article, pressure drop measurements were obtained on a silicon multi-microchannel evaporator with 85 urn wide and 560 mu m high channels separated by 46 mu m wide fins.

TL;DR: In this paper, a large-eddy simulation (LES) was used to study the influence and the resulting flow mechanisms of active flow control applied to a two-dimensional vehicle geometry.