Abstract Gaseous reduction by hydrogen was performed for three types of hematite pellets, two from industry and one prepared in the laboratory. The mechanisms pellets were studied based on morphologies partially reduced samples. Two found, industrial being very similar. degree followed as a function time each type pellets. On basis reaction mechanism mathematical model developed. As pioneer effort, combined computational fluid dynamics approach flow mass transfer gas phase with diffusion...

The present investigation addressed the entropy generation, fluid flow, and heat transfer regarding Cu-Al 2 O 3 -water hybrid nanofluids into a complex shape enclosure containing hot-half partition were addressed. sidewalls of are made wavy walls including cold isothermal temperature while upper lower surfaces remain insulated. governing equations toward conservation mass, momentum, energy introduced form partial differential equations. second law thermodynamic was written for friction...

Due to the high enthalpy of fusion in water, ice storage systems are known as one best cold thermal energy systems. The phase change material used these is thus it inexpensive, accessible, and completely eco-friendly. However, despite numerous advantages systems, process them time-consuming this leads difficulties their practical application. To solve problem, addition nanomaterials can be helpful. This study aims investigate compound heat transfer enhancement a cylindrical-shaped unit...

The mixed convection two-phase flow and heat transfer of nanofluids were addressed within a wavy wall enclosure containing solid rotating cylinder. annulus area between the cylinder was filled with water-alumina nanofluid. Buongiorno’s model applied to assess local distribution nanoparticles in host fluid. governing equations for mass conservation nanofluid, nanoparticles, energy nanofluid carried out converted non-dimensional pattern. finite element technique utilized solving numerically....

In the present work, a parabolic trough solar (PTC) collector with inner helical axial fins as swirl generator or turbulator is considered and analyzed numerically. The three-dimensional numerical simulations have been done by finite volume method (FVM) using commercial CFD code, ANSYS FLUENT 18.2. spatial discretization of mass, momentum, energy equations, turbulence kinetic has obtained second-order upwind scheme. To compute gradients, Green-Gauss cell-based employed. This work consists...

Variable speed wind turbines are commonly used as power generation systems because of their lower maintenance cost and flexible control. The optimum output for a turbine can be extracted using maximum point tracking (MPPT) strategies. However, unpredictable parameters, such air density could affect the accuracy MPPT methods, especially during small oscillations. In this paper, in permanent magnet synchronous generator (PMSG), is implemented by determining uncertainty parameters extended...

In this paper, a thermal performance assessment of traditional building constructions and configurations in various Moroccan climates is carried out. This research focuses on enhancing conventional energy efficiency buildings by investigating the behavior single clay walls, double simple brick walls based long-term meteorological data using TRNSYS software. The roof pitch, comfort discomfort index, consumption are considered while selecting for each temperature zone. It noticed that...

It is well known that the use of photovoltaic (PV) systems helps to preserve environment, produce lower levels greenhouse gases (GHGs), and reduce global warming, however, whether it economically profitable for customers or not highly debatable. This paper aims address this issue. To be comprehensive, three different types buildings are considered as case studies. Then, these modeled in EnergyPlus determine rate energy consumption. Afterward, comparisons various solar system sizes based on...

Abstract In this numerical work, heat transfer characteristics of humid air in a rectangular channel as solar heater equipped with V‐shaped ribs has been investigated. The impacts geometrical parameters proposed such height, pitch, and angle relative to flow direction, well humidity Reynolds number inlet on thermal performance have evaluated. results achieved using commercial Computational Fluid Dynamics (CFD) code, ANSYS FLUENT 18.2, which works based finite volume method. Outcomes shows...

Abstract In this paper, the thermal performance improvements of a heat removal system like an electronic have been analyzed. The studied case is horizontal channel in which two partially inclined baffles are attached with variable height and number. crossed by forced convective flow cooling fluid (air). This numerical work evaluates influences number on enhancement transfer rate. mathematical model composed nonlinear partial equations that analytical solution for them very complex, hence...

In this paper, a new method is proposed for motion vector steganalysis using the entropy value and its combination with features of optimized vector. method, blocks calculated to determine their texture precision vectors. Then, by fuzzy cluster, are clustered into high low texture, while membership function each block class indicates that block. These functions used weight effective extracted reconstructing estimation equations. Characteristics results indicate use irregularity increases...

Abstract In this paper, single-phase laminar forced convection of nanofluids flow over a 2D horizontal backward facing step (BFS) subjected to bleeding condition (suction/blowing) is investigated numerically. The continuity, momentum and energy equations are solved by computational fluid dynamic (CFD) technique, while the SIMPLE algorithm employed for pressure-velocity coupling. Various volume fractions nano-particles dispersed in base (water) produce different types nanoflouids. each test...

Abstract Ceramic foam filters (CFFs) are used to remove solid particles and inclusions from molten metal. In general, metal which is poured on the top of a CFF needs reach certain height build required pressure (metal head) prime filter. To estimate head, it necessary obtain permeability coefficients using permeametry experiments. It has been mentioned in literature that avoid fluid bypassing, during permeametry, samples need be sealed. However, effect bypassing experimentally obtained...

The present paper aims to investigate the influence of perforated membrane geometry on performance biosensors. For this purpose, a 2-D axisymmetric model an amperometric biosensor is analyzed. governing equations describing reaction-diffusion containing nonlinear term related Michaelis–Menten kinetics enzymatic reaction are introduced. partial differential equations, along with boundary conditions, first non-dimensionalized by using appropriate dimensionless variables and then solved in...

This paper investigates the cooling performance of nanofluid (NF) mixed convection in a porous I-shaped electronic chip with an internal triangular hot block using Buongiorno's two-phase model. type cavity and geometry has not been studied formerly. The NF was assumed to be mixture water CuO nanoparticles (NP) up 4% volume concentration. As most published mathematical models for thermal conductivity give inaccurate predictions, new predictive correlation effective also developed high...