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605 articles for “Navier–Stokes equation”
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3D Non-Linear Finite Element Analysis of Spur Gear
Abstract: Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 Contact stresses and bending stresses are two cyclic stresses which occur on gear teeth surfaces and it is very important to predict these stresses on gear teeth accurately. Many researchers conducted contact analyses to investigate contact stresses and bending stresses on two-dimensional (2D) spur gears and a few people investigated a three-dimensional (3D) spur gear through finite element method (FEM) under …
Published in Trends in Mechanical Engineering & Technology · Vol. 3, Issue 3, 2013 · pp. 1–6 Read article
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Investigation of Supersonic Flow Past a Cavity Using Basic Numerical Techniques
Abstract: This study, investigating various features of supersonic flow past a cavity, uses higher order essentially non-oscillatory Roe (ENO-Roe) method as the numerical method that solves full compressible Navier-Stokes equation in two dimensions. The turbulence effect is modelled considering 3% level of turbulence and by imposing the turbulent gust. It is seen that vortex shedding, which is a small scale phenomenon compared to other features of the flow, has been properly …
Published in Journal of Experimental & Applied Mechanics · Vol. 7, Issue 2, 2016 · pp. 30–40 Read article
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Displacements in Thick Beams Using Refined Shear Deformation Theory
Abstract: Normal 0 false false false EN-US X-NONE X-NONE A trigonometric shear deformation theory for displacement of thick beams, by considering the transverse shear deformation effects, is presented. Variables in the present theory are same as that of in the first order shear deformation theory. The sinusoidal function is used in displacement field in terms of thickness coordinate to represent the shear deformation effects. Governing differential equations and various boundary conditions …
Published in Journal of Aerospace Engineering & Technology · Vol. 4, Issue 3, 2014 · pp. 22–30 Read article
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Level Control using Bode’s Integral
Abstract: Normal 0 false false false EN-IN X-NONE X-NONE PID controllers are widely used in industrial plants. Usually a first or a second order model with time delay is used. Many a times even if the plant model is perfectly known, it leads to a set of nonlinear equations for which no analytic solution is available. An advanced method tries to find a solution by numerical methods or to simplify the …
Published in Journal of Instrumentation Technology & Innovations · Vol. 3, Issue 2, 2013 · pp. 16–31 Read article
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PBE-based Drop Dynamics Simulation in an Unbaffled Stirred Tank Reactor
Abstract: The population balance equation (PBE)-based model describes the distribution of drop size with respective to its size. In this work, 30% TBP was dispersed in 4N nitric acid solution by turbine impeller. Drop-size distributions were measured with a 630 nm laser-based particle size analyzer. For daughter drop density function, a normal distribution function was considered. For breakage rate, Voigt model of Chen et al. was used in the simulation [1]. …
Published in Journal of Nuclear Engineering & Technology · Vol. 6, Issue 1, 2016 · pp. 25–35 Read article
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Impact of Aila on the Dissolved Oxygen Level in the Indian Sundarbans Region
Abstract: The Indian Sundarban delta complex is one of the hot spots of biodiversity in the Indian subcontinent sustaining some 34 species of true mangrove flora. The aquatic phase is saturated with dissolved oxygen (DO) and the average values in the present study area, Ajmalmari (considered on the basis of 3 decades; 1984–2014) are 5.81 ppm, 6.43 ppm and 6.13 ppm in premonsoon, monsoon and postmonsoon seasons respectively. These values include …
Published in Journal of Energy, Environment & Carbon Credits · Vol. 5, Issue 3, 2015 · pp. 30–33 Read article
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Numerical Simulation of Entrained-flow Coal Gasification: A Study on Particles History
Abstract: Normal 0 false false false MicrosoftInternetExplorer4 Studies of coal particle history during coal gasification inside the gasifier are very limited. A comprehensive 3D numerical simulation of entrained-flow coal gasification is conducted. The Eulerian-Lagrangian approach is applied to solve the Navier-Stokes equations and the particle dynamics. The finite rate/eddy dissipation model is used to calculate the rate of gasgas phase reactions, whereas only finite rates are used for solid-gas phase reactions. …
Published in Journal of Energy, Environment & Carbon Credits · Vol. 6, Issue 3, 2016 · pp. 9–18 Read article
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Analytical Solution to Bi-Linear Spring Mass Systems Free Vibration
Abstract: Dynamic systems are generally categorized as linear and non-linear systems based on the analysis approaches developed. Bi-linear spring mass systems form an intermediate category which possesses characteristics of both linear and non-linear systems. Analytical solutions to bi-linear systems cannot in general be reduced to a single equation covering the entire motion domain as in the case of linear systems. Nevertheless, the step-wise linear solutions can be obtained within each domain …
Published in Journal of Aerospace Engineering & Technology · Vol. 8, Issue 1, 2018 · pp. 21–35 Read article
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Numerical and Experimental aspects in two phase flow
Abstract: A complete numerical simulation of a bubble of lower density being introduced in fluid has been done. Transient finite volume used for the descritization of Navier Stokes equation and suitable boundary condition have been appiled to understand the dynamics of bubble.
Published in Journal of Refrigeration, Air conditioning, Heating and ventilation · Vol. 5, Issue 3, 2018 · pp. 7–16 Read article
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Study on the Wave Diffraction Patterns in the Kakinada Bay
Abstract: Kakinada is one of the major upcoming portsof India and holds great importance for shipping activities. This region is said to be low-lying area and highly susceptible to erosion. To protect the port from action of waves, tides and strong currents, breakwater was constructed at the entrance of the channel. Current study makes an attempt to understand how wave energy gets reduced and wave diffraction occurs due to presence of …
Published in Journal of Offshore Structure and Technology · Vol. 7, Issue 3, 2020 · pp. 6–15 Read article
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The Theoretical and Experimental Study of the Behavior of Gas Bubbles in the Effects of Vibration in the Conditions of Impact of Aircraft’s Overloads and Weightlessness
Abstract: The study of the dynamic behavior of gas bubbles in the fluid and the control by the gas phase in the conditions, close to weightlessness, using the different types of the vibration are important for solving the number of the technological problems, connected to the needs of space technology (degassing special fluids and fuel). The task of the theoretical description of vibration impact on the air bubbles in the fluid …
Published in Journal of Aerospace Engineering & Technology · Vol. 9, Issue 2, 2019 · pp. 40–49 Read article
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The theoretical and experimental study of the behavior of the gas bubble, fixed on the surface of the solid material, under changing the acceleration of gravity
Abstract: At present time, accumulated theoretical material of the studies of the equilibrium forms of the gas bubbles, fixed on the surface of solid material in the fluid, under the decrease of the acceleration of gravity, was conducted either on the basis of the geometric laws of similitude that strongly simplified the essence of the physical processes or on the basis of the theoretical qualitative assessments of the existing hydrostatic equations …
Published in Journal of Aerospace Engineering & Technology · Vol. 9, Issue 3, 2019 · pp. 1–15 Read article
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Regression Analysis of the Effect of Different N Doses in Calendula officinalis L.
Abstract: AbstractThe present study was conducted to investigate the effects of different nitrogen doses (0, 3, 6, 9 ve 12 kg/da) on flower yield and some yield parameters of pot marigold (Calendula officinalis L.) plants in 2015 under ecological conditions of Samsun province of Turkey. The first flower harvest was performed on 10th of July and 24 harvests were performed throughout the experiments. The greatest fresh and dry flower yields were …
Published in Research & Reviews : Journal of Agricultural Science and Technology · Vol. 6, Issue 1, 2017 · pp. 15–19 Read article
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Population biology of the Sleeper fish Eleotris vittata from New Calabar River , Port Harcourt, Nigeria
Abstract: The population of Eleotris vittata was studied in the New Calabar River over a period of twelve months with the aim of providing a baseline data for the management of the stock; this was due to unavailability of information on the status of the stock. Analysis for growth using the Von Bertalanffy function revealed that length infinity was 26.34cm, parameter of curvature was 1.18cm/year, and the growth performance index was …
Published in Research & Reviews : Journal of Ecology · Vol. 8, Issue 2, 2019 · pp. 28–31 Read article
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A Parametric Investigation on the Drag Effect Consideration in Re-Entry Vehicle Performance
Abstract: Rocket adaptation relies more on normal gravity experimentation and simplified conventional theories. The related complexities and lack of well-defined prediction system have always restricted futuristic missions. The work primarily addresses issues related to the accurate prediction of rocket dynamics and re-entry vehicles. Parametric study on the conventional equation systems was carried out with consideration of geometric and design variables. Emphasis is put on the practical cases with minimization of assumptions. …
Published in Research & Reviews : Journal of Space Science & Technology · Vol. 5, Issue 3, 2016 · pp. 7–26 Read article
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A Study of Total Electron Content Variations Over Abuja (Nigeria) using the GNSS
Abstract: Effects of space weather are usually related to disturbances in the ionosphere such as change in total electron content (TEC), which is an important descriptive quantity for the ionosphere of the earth. This has an important effect on the Global Navigation Satellite System (GNSS) as it causes delay in range measurements. The knowledge of this TEC change is therefore very significant to various GNSS users. This work presents the variation …
Published in Research & Reviews : Journal of Space Science & Technology · Vol. 4, Issue 3, 2015 · pp. 1–6 Read article
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The time interval in moving frames can be negative
Abstract: With respect two each other in the moving frame two time interval between and minus the result will be another time interval in moving frame. Therefore In particular case will be, for which the time interval will be negative. Here, is the relativity time, is the rest time interval. This equation is Einstein’s time dilation equation And since, Where, is a time interval in moving frame. This time interval can …
Published in Research & Reviews : Journal of Space Science & Technology · Vol. 8, Issue 1, 2019 · pp. 28–31 Read article
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Study of Phase Velocity and Magneto Plasmon Dispersion on the Surface of Carbon Nanotubes in Low Energy State
Abstract: Several authors have worked on theoretical and experimental plasmon excitations. The researchers have been studying the dispersion relation of magneto plasmon in the low energy state on a cylindrical surface of carbon nanotube obtained with the help of linear-angular momentum transfer. Here, we demonstrate the Dirac-like Hamiltonian equation for carbon nanotubes in the presence and absence of a parallel applied magnetic field. We assume the cylindrical carbon nanotube is infinitesimally …
Published in Research & Reviews : Journal of Physics · Vol. 11, Issue 3, 2022 · pp. 21–25 Read article
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An Optimize Formulation to Synthesis of size Controlled Hydrophobic Starch Acetate Nanoparticles using Box- Behnken Design
Abstract: The best way to improve the overall performance of native starch is by chemical modification. In recent years, hydrophobically modified starch has attracted considerable attention for the design and manufacture of novel nanoparticulate drug delivery carriers. The purpose of this research was to synthesize hydrophobic starch nanoparticles (NPs) and to optimize process factors through the use of response surface methodology (RSM). The corn starch acetate (CSA) NPs was synthesized using …
Published in Journal of Polymer & Composites · Vol. 10, Issue 4, 2022 · pp. 32–54 Read article
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Thermal Analysis of Isotropic and Orthotropic Plate by Trigonometric Shear Deformation Theory
Abstract: In the present study, a sinusoidal shear and normal deformation theory taking into account effects of transverse shear as well as transverse normal is used to develop the analytical solution for the bidirectional bending analysis of isotropic, transversely isotropic, laminated composite and sandwich rectangular plates. Governing equations and boundary conditions of the theory are obtained using the principle of virtual work. The Navier solution for simply supported laminated composite plates …
Published in Journal of Geotechnical Engineering · Vol. 9, Issue 4, 2022 · pp. 38–59 Read article