Showing papers in "International Journal of Thermal Sciences in 2014"

TL;DR: In this paper, the problem of natural convective boundary-layer flow of a nanofluid past a vertical plate is revisited and the model, which includes the effects of Brownian motion and thermophoresis, is revised so that the particle fraction on the boundary is passively rather than actively controlled.

TL;DR: In this paper, a steady-state test system was constructed to measure the effective thermal conductivities of composite PCMs, which were also theoretically calculated based on the correlations and models from the literature.

TL;DR: In this paper, the effects of nanoparticle concentration, shear and buoyancy forces, and turbulence on flow and thermal behavior of nanofluid flow were studied, and the model predictions for very low solid volume fraction were found to be in good agreement with earlier numerical studies for a base fluid.

TL;DR: In this paper, the available data for the zeta potential as a function of pH is discussed and various types of nanoparticles with different base fluids are investigated, including metallic and nonmetallic nanoparticles.

TL;DR: In this paper, a modified two-component four-equation nonhomogeneous equilibrium model was employed for nanofluids, which fully accounted for the effect of the nanoparticle volume fraction distribution.

TL;DR: In this article, the effects of two kinds of surfactants (SDS and polyvinylpyrrolidone) on the stability and thermal conductivity of Al 2 O 3 /de-ionized water nanofluids are analyzed respectively.

TL;DR: In this article, the effects of the governing parameters on the dimensionless quantities like velocity, temperature, nanoparticle concentration, density of motile microorganisms, local Nusselt, and local Sherwood numbers for both nanoparticles and motile microscopic density are explored.

TL;DR: In this article, a numerical investigation on the heat transfer and fluid flow characteristics of fully developed turbulent flow in a rectangular duct having repeated transverse square sectioned rib roughness on the absorber plate has been carried out.

TL;DR: In this article, the performance of curved winglet VGs with and without punched holes was investigated using dimensionless numbers, and the results showed that the hole punched at lower position in vertical direction and at the centerline of lateral direction presents better heat transfer enhancement and thermohydraulic performance.

TL;DR: In this paper, the phase change heat transfer inside a cylindrical latent heat energy storage system (LHESS) is investigated. But the phase-change material (PCM) used is dodecanoic acid.

TL;DR: In this article, the authors summarize the literature on mass transfer in nanofluids stating the conflicts and possible reasons, and suggest mass transport mechanisms for convective mass transfer with respect to heat and mass transfer.

TL;DR: In this paper, the authors compared single-phase and two-phase models to predict convective heat transfer coefficient and friction factor at the entry region of uniformly heated pipe, and found that the simulation results showed that the Eulerian-Eulerian model can reduce the computational cost by up to 50% in terms of accuracy and computational cost.

TL;DR: Graphene-epoxy thermal conductive adhesive was obtained using few-layer graphene sheets as additives which were fabricated by a reexpansion and exfoliation method.

TL;DR: In this paper, the heat transfer coefficients and friction factor of TiO2/water nanofluid up to 3.0% volume concentration at an average temperature of 30°C were investigated in the Reynolds number range of 8000-30,000 for flow in tubes and with tapes of different twist ratios.

TL;DR: In this paper, a theoretical model of a hybrid power generation device consisting of a low concentrated photovoltaic (CPV) module and a thermoelectric generator (TEG) is established and expressions for the efficiency and power output of the hybrid device are derived and discussed in detail, based on non-equilibrium thermodynamics theory and law of conservation of energy.

TL;DR: In this article, a lid-driven laminar mixed convection inside a cavity filled with water is studied numerically, and the results have showed that there are critical values for the partial slip parameter at which the convection is declined.

TL;DR: In this article, the steady stagnation point flow of a Casson nano fluid in the presence of convective boundary conditions is investigated. And the resulting ordinary differential equations are successfully solved analytically using Optimal Homotopy analysis method (OHAM) via BVPh2.0.

TL;DR: In this article, the experimental studies on flow visualization, pressure drop and heat transfer characteristics of microchannels presented by different researchers are summarized, some different flow patterns observed in microchannel geometry such as bubble nucleation in thin film, periodic variation of flow pattern, flow circulation, bubble suppression and cross-channel flow are explained briefly.

TL;DR: In this article, a three-dimensional solid-fluid conjugated model is coupled with a simplified conjugate-gradient method to optimize the flow and heat transfer in a water-cooled, silicon-based double-layer microchannel heat sink (MCHS).

TL;DR: In this paper, a closed loop Pulsating Heat Pipe (CLPHP) with four transparent glass tubes forming the adiabatic section and connected with copper U-turns in the evaporator and condenser sections is designed in order to perform comprehensive thermal-hydraulic performance investigation.

TL;DR: In this paper, the hydraulic and thermal fields of a 29nm CuO nanoparticle-water nanofluid with various volume fractions, 0.24, 1.03% and 4.5%, were investigated inside a rectangular microchannel heat sink under both laminar and turbulent conditions.

TL;DR: In this paper, the authors proposed a numerical model to simultaneously predict the fluid flow and heat transfer on both air-side and water-side of elliptical FTHE, and the results indicated that the axis ratio strongly interacts with air velocity and water volumetric flow rate.

TL;DR: In this paper, the authors used an alumina and titania nano-coolant (NC) to enhance the heat dissipation performance of an air-cooled radiator.

TL;DR: In this paper, a single pass counter flow chevron corrugated-plates plate heat exchanger considering nanofluids (CeO 2 and Al 2 O 3 ) as homogeneous mixtures has been presented.

TL;DR: In this article, a comparative evaluation of seven common configurations of channels used in plate-fin heat exchangers is presented, including plain, perforated, offset strip, louvered, wavy, vortex-generator, and pin.

TL;DR: In this article, an experimental study was carried out to investigate heat transfer and friction factor characteristics of γ-Al 2 O 3 /water nanofluid through circular tube with twisted tape inserts with various thicknesses at constant heat flux.

TL;DR: In this article, a plasma-sprayed magnesia-stabilized zirconia coating on an aluminum piston crown was used to improve the performance of a diesel engine.

TL;DR: In this article, the effect of heat transfer performance of a phase change material (PCM) based plate fin heat sink matrix under constant and intermittent heat loads was quantified by an experimental study.

TL;DR: In this paper, molecular dynamics simulations of heat transport through a water-silicon system were performed to investigate the thermal resistance at water/silicon interface, where the interaction strength between water and silicon is varied in order to understand its effects while the proper strength value is characterized by matching the nano-scale contact angle value with the micro-scale experimental measurements through water droplet study.

TL;DR: In this paper, two types of high conductivity pathways (inserts) with "Phi" or "Psi" shape are introduced and compared with the tree-shaped configurations already mentioned in literature.