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An analysis has been carried out to investigate the heat and mass transfer effects in steady axi-symmetric flow of a polymeric liquid (Maxwell fluid) between two infinite stretching disks in the presence of chemical reaction. Particular attention is to compute similarity solution of the governing nonlinear partial differential equations. The series solution of transformed nonlinear ordinary differential...
In this paper, a modification of the multiscale finite-volume method (MsFVM) in its OBMM version (operator-based multiscale method) is introduced. The iterative modified multiscale control volume method (I-MMCVM) is applied to solve the elliptical problem that describes the single-phase fluid flow through heterogeneous porous media. The modifications proposed are accomplished by: (1) resettling the...
This paper presents the results of nine concrete columns reinforced with longitudinal and transverse glass fiber-reinforced polymer (GFRP) bars and two concrete columns reinforced with longitudinal steel bars and transverse GFRP bars. These specimens were tested under lateral cyclic quasi-static loading while simultaneously subjected to constant axial load. The influence of the volumetric ratio of...
The present study experimentally investigates the effect of metal oxide nanoparticles on the ignition probability, ignition zone, and burning time of the diesel fuel. For this purpose, a series of hot plate ignition tests are conducted on the diesel fuel droplets with and without nanoparticles. The comparative performances of the pure diesel and diesel fuel containing 0.03 and 0.05 wt% of Al2O3, CeO...
Magnetohydrodynamic flow of Sisko liquid over a stretching surface is addressed. Stretching property of sheet is the main agent for fluid flow. Heat transfer is modelled by convective condition. Homogeneous–heterogeneous reactions are also attended. Ordinary differential systems are acquired by using proper transformations. The resulting non-linear system is solved via ND solve shooting technique...
This work investigates the cut quality characteristics of SS321 using plasma arc cutting. The SS321 has a wide range of applications such as in chemical storage, exhaust manifolds of automotives and aircraft. The intricate shapes for this material are very difficult to cut using conventional machining process. Hence, plasma arc cutting is used. The input cutting parameters are cutting speed, current,...
This analysis investigates the problem of heat transfer for steady flow in a two-dimensional Maxwell fluid between an axisymmetric channel having upper porous wall by incorporating thermal radiation impacts. An analytic solution is obtained for the resulting nonlinear equations using parameterized perturbation method (PPM). For studying the precision and strength of the present finding obtained by...
Analysis and suppression of tool chatter are essential for maintaining the high-performance level and enhancing the useful life of machinery. Despite the immense work done within this domain, still many aspects related to regenerative chatter remain unexplored. Researchers had suggested various techniques to explore the chatter mechanism based on feature extraction of experimentally recorded chatter...
Jirau hydropower plant (Jirau HPP) is one of the largest scale run-of-river hydro-projects in the Madeira River, Brazilian Amazon. This project has attracted strong national and international attention, especially with respect to environmental issues, because the Madeira River supports a diverse fish species. Many of these are migratory species and impact the reproductive stocks of the fishes that...
A methodology for solving three-dimensional topology optimization problems through a two-level mesh representation approach is described and evaluated. Structural topology optimization problems are executed on a polytope-based mesh, which carries the design variable (and subsequently the density). Displacement field is determined using tetrahedron elements, embedded within the polytopes. The proposed...
An advanced concept of jet aircraft (known as “more electric aircraft”) available nowadays requires electrically driven systems. In this scenario, application of low-temperature fuel cells in aircraft is an interesting alternative to generate power for the electrically driven systems with high efficiency and low environment impact. However, hydrogen fuel cells pose difficulties for aircraft designers...
Air ejectors are, practically, applicable devices used to remove air following a membrane integrity test (MIT). In the present work, investigations of the influence of geometrical parameters on the air ejector performance are performed numerically. Simulations have been performed by solving the steady compressible two-dimensional Reynolds-averaged Navier–Stokes together with realizable k-ε turbulence...
In the present work, optical glass BK-7 was drilled by rotary ultrasonic machine. Response surface methodology was amalgamated with desirability approach to frame the experimental matrix and seek pragmatic solutions to cope with the real machining problems. Spindle speed, ultrasonic power and feed rate were extensively scrutinized to evaluate the machining proficiency in terms of material removal...
In this study, a Homogeneous charge compression ignition–Direct injection (HCCI–DI) engine was experimentally investigated with waste cooking oil (WCO) biodiesel and its blends with diesel as the DI fuel and gasoline as the premixed fuel. 20% of the gasoline was introduced as the premixed charge and remaining 80% of the fuel was supplied directly into the cylinder at 23° before top dead centre (TDC)...
This paper presents the development of a three-dimensional hydrodynamic model for wind-driven circulation using the moving element method in the vertical discretization. As most three-dimensional models use sigma coordinate transformation in the vertical discretization, the use of the moving element method is an alternative to the latter, with the advantage that there is no need for fixed subdivision...
This study deals with the comparison of stresses and displacements of a circular ring obtained by two numerical formulations, namely the stiffness method and the hybrid method, applied to isoparametric quadrilateral elements. After explaining the formulation of the hybrid method in finite elements, an orthogonalization method proposed previously for hybrid elements is applied. Then, the computational...
The article reviews the vector method of solving one of the important problems of the dynamic analysis of planar linkages—the kinetostatic analysis, which is to determine the reactions in kinematic pairs and to balance the moment (force) on the driving medium with a given law of motion of the mechanism. This problem is of great practical value when choosing the electric motor and calculating bearings...
The focus of the present paper is the parametric dynamic study of a flexible bird-like flapping-wing micro-air vehicle (FMAV). A model of a flapping-wing MAV, containing main body, flapping mechanism, flexible wings, and propulsion system consisting of battery, DC motor, and gear box using the bond graph method is presented and then the governing equations of motion from the conceptual model is derived...
Applying engineering design concepts and analysis, this work outlines the development of a small scale root cleaner from computer model simulation to a working prototype. The methodologies of mechanical design, material acquisition, construction and prototype testing are addressed. Results of researches of innovative technologies of tuberous roots cleaning process showed that efficiency increase of...
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