Experimental and numerical study of temperature evolution and hydrogen desorption process on an amorphous alloy MgNi.

In the present study, we explored the temperature evolution and hydrogen desorption properties of the MgNi alloy through both numerical simulation and experimental analyses. Desorption kinetics characterization was carried out using the volumetric method, specifically employing a Sievert's-type apparatus to investigate solid-gas reactions. The experiments covered a temperature range from 313 K to 353 K, with an initial hydrogen pressure of 12 bar.

Physical Analysis and Mathematical Modeling of the Hydrogen Storage Process in the MmNiMn Compound.

The results of an experimental and mathematical study into the MmNiMn compound's hydrogen storage properties are presented in the present research. Plotting and discussion of the experimental isotherms (P-C-T) for different starting temperatures (288 K, 298 K, 308 K, and 318 K) were carried out first. Then, the enthalpy and entropy of formation (ΔH, ΔS) were deduced from the plot of van't Hoff.

Enhancing Concrete Properties with Agave Americana Fiber Reinforcement.

This research article explores the potential of using agave Americana fibers (AAFs) to enhance the physical and mechanical properties of concretes. The study investigates the impact of AAFs on concrete mix proportions in detail. Different concrete compositions are systematically created by integrating AAFs into them.

A study of the magnetic properties of LaNi and their effect on hydrogen desorption under theaction of a magnetostatic field.

A study of the magnetic properties of LaNi intermetallic compoundand and their effect on desorption reaction was carried out as a function of temperature. A Vibrating Sample Magnetometer (VSM) was used for the magnetic measurements and a Metal Hydrogen Reactor (MHR) supplied by a constant current through a coil was used for the hydrogen desorption reaction under the action of a magnetostatic field. Then, the hysteresis cycle, the first magnetization curve, the thermo-magnetization curves and the desorbed hydrogen mass were determined.

Experimental and Theoretical Studies of Hydrogen Storage in LaNiAlFe Hydride Bed.

In this article, the experimental measurements of the absorption/desorption P-C-T isotherms of hydrogen in the LaNiFeAl alloy at different temperatures and constant hydrogen pressure have been studied using a numerical model. The mathematics equations of this model contain parameters, such as the two terms, n and n representing the numbers of hydrogen atoms per site; N and N are the receptor sites' densities, and the energetic parameters are P and P. All these parameters are derived by numerically adjusting the experimental data.

Experimental study of the microstructures and hydrogen storage properties of the LaNiMnCo alloys.

In the present study, the absorption and desorption kinetics of hydrogen and the isotherm (P-C-T)) of the LaNiMnCo alloy were measured at values of 283 K, 303 K, and 313 K. The morphological states of this sample were examined using characterization techniques, including X-ray diffraction and scanning electron microscopy. The thermodynamic functions for the absorption-desorption of hydrogen by hydrides, such as enthalpy (H) and entropy (S), were calculated from the experimental data or by using a model that exists in the literature and is premised on the adjustment of isotherm curves at various temperatures.

Sustainable Approach of Using Leaves Reinforced Cement Mortar/Fly Bottom Ash Composites.

Earlier research suggested using ash to substitute cement, whereas other studies looked at the possibility of using plant-derived agricultural wastes as fiber reinforcement in cement applications. This study offered an environmentally friendly option to change traditional mortars by replacing cement with fly bottom ash (FBA) waste at 10, 20, 30, and 40 wt %. Likewise, leaves (ADL) were employed to reinforce the modified cement mortars at 0.

Experimental and theoretical study of CO adsorption by activated clay using statistical physics modeling.

The objective of this paper was to study CO adsorption on activated clay in the framework of geological storage. The activation of clay was characterized scanning electron microscopy, N adsorption-desorption isotherms, and X-ray diffraction. The adsorption isotherms were generated at different temperatures, namely, 298 K, 323 K, and 353 K.

Lattice Boltzmann model for incompressible axisymmetric thermal flows through porous media.

The present work proposes a simple lattice Boltzmann model for incompressible axisymmetric thermal flows through porous media. By incorporating forces and source terms into the lattice Boltzmann equation, the incompressible Navier-Stokes equations are recovered through the Chapman-Enskog expansion. It is found that the added terms are just the extra terms in the governing equations for the axisymmetric thermal flows through porous media compared with the Navier-Stokes equations.

Effect of the Heat Pipe Adiabatic Region.

The main motivation of conducting this work is to present a rigorous analysis and investigation of the potential effect of the heat pipe adiabatic region on the flow and heat transfer performance of a heat pipe under varying evaporator and condenser conditions. A two-dimensional steady-state model for a cylindrical heat pipe coupling, for both regions, is presented, where the flow of the fluid in the porous structure is described by Darcy-Brinkman-Forchheimer model which accounts for the boundary and inertial effects. The model is solved numerically by using the finite volumes method, and a fortran code was developed to solve the system of equations obtained.