Showing papers in "Advanced Powder Technology in 2018"

TL;DR: In this paper, the effects of nanoparticles volume fraction, flow direction and Reynolds number on base fluid, nanofluid and wall temperatures, thermal efficiency, Nusselt number and convection heat transfer coefficient have been studied.

TL;DR: In this paper, the effects of the air volume ratio parameters (axial-to-radial flow ratio of the wall-attached air cylinder "δ" and the forced-toexhaust ratio "β") on the air curtain dust suppression in a rock tunnel's fully-mechanized working face, the eastern belt of Huipodi mining company (Shanxi Mineral Group Co., Ltd., China) was numerically simulated by CFD software in this study.

TL;DR: In this paper, the effects of the number of fins and their length on heat transfer enhancement and entropy generation are scrutinized using a two-phase approach, and results indicate that adding porous fins with a high Darcy number improves heat transfer while fins with low Darcy numbers can weaken the convection and decline Nusselt number.

TL;DR: In this paper, the combined effects of heat and mass transfer on the peristaltic propulsion of two-phase fluid flow through a Darcy-Brinkman-Forchheimer porous medium with compliant walls are investigated.

TL;DR: In this article, the effects of simultaneous implementation of corrugated walls and nanoparticles on the performance of solar heaters are investigated, and the effect of wall profiles and nanoparticle concentration on the pertinent parameters including Nusselt number, pressure drop, performance evaluation criterion, and thermal and frictional irreversibilities are studied.

TL;DR: Yellow pepper extract and quercetin were used for YPE-AgNPs fabrication and AgNPs had robust antibacterial and antibiofilm activity against ESβL(+) Escherichia coli, Pseudomonas aeruginosa, and methicillin sensitive and resistant Staphylococcus aureus.

TL;DR: In this article, the as-prepared Ag NPs with averaged sizes of 2, 12 and 32 nm were characterized by transmission electron microscopy (TEM), ultraviolet-visible absorption spectroscopy (UV-vis), X-ray powder diffraction (XRD) and Fourier transform infrared spectroscope (FTIR) and assessed by broth dilution and disk diffusion as well as measurement of optical density.

TL;DR: In this paper, an equiatomic quinary AlCoCrFeNi high entropy alloy (HEA) has been synthesized by mechanical alloying, and the analysis of in-situ heating X-ray diffraction patterns at various temperatures extends support to the diffusive nature of the phase transformation.

TL;DR: In this article, magnetically recoverable g-C3N4/Fe3O4/Ag2WO4 /AgBr (gCN/M/AgW/AgBr) nanocomposites, as greatly efficient visible-light-active photocatalysts, were fabricated by successive decoration of Fe3 O4, Ag2 WO4, and AgBr over g-CN.

TL;DR: The green synthesized copper oxide nanoparticles (CuO NPs) were evaluated for their catalytic efficiency using various analytical studies in this article, which showed that the NPs could be used in photolysis to remove water pollutants.

TL;DR: In this article, a method has been designed that included one-step synthesis of magnesium oxide nanoparticles (MgO NPs) by fungal melanin under the influence of different doses of gamma rays.

TL;DR: In this article, the degradation rate constants on the g-C3N4/Fe3O4/CuWO4 (30%) nanocomposite were almost 10.5, 17, 12.5 and 42.5 times higher than those of the pristine g-c3n4 for degradations of RhB, MB, MO, and fuchsine, respectively.

TL;DR: In this paper, a multi-radial vortex wind generator was designed and developed in order to control the diffusion of dusts towards the working area in an excavation face, using a self-designed simulation system, the multidimensional vortex airflow migration and dust diffusion rules were experimentally investigated.

TL;DR: In this article, the NH2-UiO-66, a metal organic framework (MOF) with zirconium as metal and amino terephthalic acid as a linker, was reported.

TL;DR: In this article, the co-effect of the inclination angle, heater configuration, and nanofluid and porous media on heat transfer enhancement has been investigated with detailed investigation of the decision variables effect (Rayleigh number, Darcy number, inclination angle and volume fraction of Cu nanoparticles).

TL;DR: In this paper, the authors constructed a mathematical model that describes the interactions among droplets, dust and airflows in a fully-mechanized excavation face, and validated the accuracy of the established model.

TL;DR: In this article, the effect of the aspect ratio of WO3 particles on the photochemical process and their inherent reactive species mechanism was investigated and it was shown that high aspect ratio facilitates the absorption coefficient and resultant efficiency.

TL;DR: In this paper, support vector regression (SVR) models were developed to predict the thermal conductivity enhancement for metallic and metallic-oxide nanofluids, and the accuracy and reliability of the developed models were assessed using statistical parameters such as correlation coefficient (R2), root mean square error (RMSE), and mean absolute error (MAE).

TL;DR: In this paper, a system dynamic model is presented to predict the final particle size of milled powder during ball milling process, which is used to obtain the optimum ball size, milling speed and milling time that achieve the best particle size reduction of metal-matrix nanocomposites.

TL;DR: In this paper, a sustainable green synthetic strategy to synthesize magnesium oxide nanoparticles by employing Costus pictus D. Don plant leaf extract as a reducing agent was confirmed by comprehensive characterization techniques.

TL;DR: There are several powder homogeneity evaluation techniques which differ in accuracy, fundamental basis, cost and operating conditions as discussed by the authors, and the advantages and drawbacks of all the techniques are reviewed to help the readers to select the appropriate equipment for the powder mixing evaluation.

TL;DR: The proposed calibration framework has been successfully demonstrated by a case study with two-objective optimization for the model accuracy and the simulation time and has proven to be successful for accurate calibration of material parameters with the optimal simulation time.

TL;DR: In this article, a green synthesis of cobalt oxide (Co3O4) nanoparticles using latex of Calotropis procera via simple precipitation method at room temperature was investigated.

TL;DR: In this article, the structural, morphological, and optical properties of the sol-gel derived TiO2 nanoparticles at different pH and calcination temperature were investigated in the present study.

TL;DR: In this article, the authors proposed to use the term Hansen Dispersibility Parameters (HDP) instead of HSP whenever dispersibility and stability of particles against agglomeration/flocculation are to be discussed.

TL;DR: In this paper, an easy, rapid and eco-friendly pathway using Phyllanthus amarus leaf extract was used to synthesize silver nanoparticles with a flower-like structure.

TL;DR: The intrinsic peroxidase-like activity of magnetite magnetic nanoparticles (Fe3O4 MNPs) has to be improved to activate H2O2 under mild conditions for practical applications.

TL;DR: In this article, the potential of aqueous leaf extract of Nigella arevensis for biosynthesis of silver nanoparticles (AgNPs) was evaluated and the formation of AgNPs was confirmed by color changes and UV-visible spectroscopy.

TL;DR: In this paper, a heulandite/polyaniline (HU/PANI) composite was prepared by mechanical mixing from natural HU and synthesized polyanilines.

TL;DR: In this article, a methodology for determining yield stress, plastic viscosity and thixotropic behaviour of CPB mixture as a function of hydration age, binder and polycarboxylate (PC) based (SP) dosages is presented.