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Showing papers in "International Journal of Heat and Fluid Flow in 2008"


Journal ArticleDOI
TL;DR: In this paper, the authors used the finite volume technique to solve the governing equations of heat transfer and fluid flow due to buoyancy forces in a partially heated enclosure using nanofluids.

1,783 citations


Journal ArticleDOI
TL;DR: In this article, a CFD strategy is proposed that combines delayed detached-eddy simulation (DDES) with an improved RANS-LES hybrid model aimed at wall modelling in LES (WMLES).

1,543 citations


Journal ArticleDOI
TL;DR: In this article, a numerical investigation of heat transfer over a backward facing step (BFS) using nanofluids is presented, where different volume fractions of nanoparticles are presented in the base fluid besides different type of nano-nodes have been used.

397 citations


Journal ArticleDOI
TL;DR: In this article, a lattice Boltzmann method was developed to couple thermal convection and pure-substance melting, and the transition from conduction-dominated heat transfer to fully-developed convection was analyzed and scaling laws and previous numerical results were reproduced by their numerical method.

246 citations


Journal ArticleDOI
TL;DR: In this article, the surface of a heater was systematically altered by oxidizing its surface to varying degrees or by depositing metal onto the surface, and the surface energy was characterized by measuring the advancing three-phase contact angle.

245 citations


Journal ArticleDOI
TL;DR: In this article, the thermal performance of nanofluid flow in a trapezoidal microchannel was analyzed using pure water as well as a nanof fluid, with volume fractions of 1% and 4% CuO-particles with dp = 28.6

240 citations


Journal ArticleDOI
TL;DR: In this article, the effect of cavitating flow on diesel fuel atomization characteristics in nozzles of different length to width (L/W) ratios was investigated, and the results showed that the cavitation flow in the nozzle can be observed when the discharge coefficient is within the range from Cd−=−0.709 to 0.8312 in case of L/W−1.8, and Cd´=− 0.5793 to0.7705 in case for L/w−2.7.

207 citations


Journal ArticleDOI
TL;DR: In this paper, the 3-omega (3ω) method was used to measure the thermal conductivity of Al2O3 nanofluids in deionized (DI) water and ethylene glycol (EG).

201 citations


Journal ArticleDOI
TL;DR: In this article, a 3D digital representation of a reticulate porous ceramic (RPC) sample was generated by X-ray tomographic scans and a computer tomography-based methodology was applied to determine the transport properties of fluid flow across porous media.

177 citations


Journal ArticleDOI
TL;DR: In this article, an unsteady laminar convective heat transfer from two isothermal cylinders of tandem arrangement is numerically investigated, and the numerical simulations were carried out by the commercial CFD software FLUENT®.

177 citations


Journal ArticleDOI
TL;DR: In this article, a two-phase mixture model was used to investigate the effects of nanoparticles mean diameter on the flow parameters and the calculated results demonstrate that the convection heat transfer coefficient significantly increases with decreasing the nanoparticles means diameter, however it does not significantly change the hydrodynamics parameters.

Journal ArticleDOI
TL;DR: In this article, the authors investigated heat transfer characteristics on various dimple/protrusion patterned walls along with a straight and rectangular test channel, and measured local heat transfer coefficients using a transient TLC technique.

Journal ArticleDOI
TL;DR: A supercritical water heat transfer facility has been built at the University of Wisconsin to study heat transfer in a circular and square annular flow channel as discussed by the authors, where the accuracy and validity of selected heat transfer correlations and buoyancy criterion were compared with heat transfer measurements.

Journal ArticleDOI
TL;DR: In this article, a series of direct numerical simulations of incompressible flow around a circular cylinder at Re = 3300 were performed, based on the far field velocity and the diameter of the cylinder.

Journal ArticleDOI
TL;DR: In this paper, the impact of the velocity and density ratio on the turbulent mixing process in gas turbine blade film cooling is investigated using large-eddy simulations (LES), and the results evidence the dynamics of the flow field in the vicinity of the jet hole, i.e., the recirculation region and the inclination of the shear layers, to be mainly determined by the velocity ratio.

Journal ArticleDOI
TL;DR: In this paper, the effects of nanoparticles concentration and tube inclinations on the hydrodynamics and thermal parameters are discussed and compared with previously published experimental and numerical works on mixed convection in a horizontal and inclined tube.

Journal ArticleDOI
TL;DR: In this paper, the mean velocity field in two 3D diffusers with the same fully developed channel inlet but slightly different expansion geometries was determined using magnetic resonance velocimetry.

Journal ArticleDOI
TL;DR: In this article, Choi et al. investigated the drag reduction properties of a turbulent channel flow modified by spanwise sinusoidal oscillations of the walls of a wall-bounded turbulent flow.

Journal ArticleDOI
Joung-Ho Lee1, Hyung Jin Sung1
TL;DR: In this article, the effects of an adverse pressure gradient (APG) on a turbulent boundary layer were investigated using a fully implicit fractional step method to simulate the flows and the instantaneous flow fields and vorticity fluctuations were analyzed to characterize the response of the outer turbulence to an APG.

Journal ArticleDOI
TL;DR: In this article, an immersed-boundary method was extended to study heat transfer problems of flow over a circular cylinder and the effect of heat transfer enhancement for flow over transversely oscillating cylinders was investigated.

Journal ArticleDOI
TL;DR: In this paper, the mean flow field and the near wake flow structures are presented and compared with those of a circular cylinder at the same Reynolds number, and the mean pressure distributions are also calculated.

Journal ArticleDOI
TL;DR: In this paper, computational fluid dynamics (CFD) was used to study heat transfer phenomena in a kerosene based ferrofluid, and the flow behavior was investigated in two cylinders with different dimensions.

Journal ArticleDOI
TL;DR: In this article, an experimental investigation to analyse the qualitative near wall effect of synthetic jets in a laminar boundary layer has been undertaken for the purpose of identifying the types of vortical structures likely to have delayed separation on a 2D circular cylinder model described in this paper.

Journal ArticleDOI
TL;DR: In this paper, three variable-density turbulent round jets discharging from a straight circular pipe into a weakly confined low-speed co-flowing air stream are studied with the aid of large-eddy simulation.

Journal ArticleDOI
TL;DR: In this article, heat transfer characteristics of pulsating turbulent air flow in a pipe heated at uniform heat flux were experimentally investigated, and the experiments were performed over a range of 104

Journal ArticleDOI
TL;DR: In this article, an experimental investigation of heat transfer due to a row of air jets impinging on a concave semi-cylindrical surface is presented, where heat transfer characteristics are measured using a heat thin foil technique and infrared thermography.

Journal ArticleDOI
TL;DR: Kobayashi et al. as discussed by the authors proposed a coherent structure model (CSM) as a subgrid-scale (SGS) model for rotating homogeneous turbulence and turbulent channel flow.

Journal ArticleDOI
Wei-Xi Huang1, Seung Hyun Lee1, Hyung Jin Sung1, Taik-Min Lee, Dong Soo Kim 
TL;DR: In this paper, a numerical study of the liquid transfer processes that occur during micro-gravure-offset printing is carried out, where liquid transfer between two parallel separating plates and between a trapezoidal cavity and an upward moving plate are simulated.

Journal ArticleDOI
TL;DR: In this paper, an experimental and numerical investigation of the turbulent flow over dimpled surfaces was carried out for a plane channel with large aspect ratio and the resulting pressure drop in the channel was measured for smooth and dimpled walls.

Journal ArticleDOI
TL;DR: In this article, the authors present an experimental investigation of the flow field instability in a centrifugal pump, where pressure fluctuations were measured with transducers placed flush with the inlet duct, and at the impeller discharge.