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Feb 12, 2018Open    AccessArticle

Comparison of Mathematical Methods to Obtain Concentration and Temperature of Newtonian Fluids in Tubular Reactors

Diego Alves de Miranda, Renato Cristofolini, Emerson José Corazza, Gilson Joao dos Santos, Claiton Emilio do Amaral
In several areas of engineering, it is possible to put real problems in mathematical functions; when we represent a problem with variables in the form of function, we were able to extract various information from it. This paper compared two different mathematical methods, being the finite difference method and the Fourth Order Range-Kutta method, to analyze the concentration and temperature of
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Jan 22, 2018Open    AccessArticle

Instability of Dielectric Liquid Surface under the Action of HV Corona Discharge Pulses

Alexander Korolev
Instability of liquid dielectrics surface, being developing after the action of an alternating current corona discharge pulse, has been experimentally investigated. Voltage amplitude on the corona electrode reaches 70 kV, frequency is 17 MHz, and pulse duration is 0.5-1 μs. This is similar to rose-window instability at electrode height above the liquid surface > 5-10 mm. At lesser heights, development of a singular crater is ob
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Dec 24, 2015Open    AccessArticle

Open Channel Flow over a Permeable River Bed

Godwin Christopher Ezike Mbah, Cyril Ifeany Udogu
This paper presents results of a modeled open channel flow through a porous media (River). In the model, we considered water as an incompressible fluid; the flow as steady and uniform; the system is assumed to be isothermal and the flow pattern is laminar. We have solved the resulting Brinkman equation using analytical method. By some mathematical operation, the momentum partial differential equation (PDE) was reduced to ordinary differential equation (ODE) and the resulting equations are solved...


Nov 23, 2015Open    AccessArticle

Ship Nonlinear Rolling and Roll Angle Reconstruction Based on FIR

Jianhui Lu, Chunlei Zhang, Shaonan Chen, Yunxia Wu
The paper analyzes the nonlinear damping torque and nonlinear restoring moment and establishes the nonlinear motion equation of ship rolling under random sea. The Runge-Kutta method is used in the time domain to solve the equation, and to simulate the time history of random wave excitation ship rolling and free decay process. This paper used the ship attitude inertial measurement system and its algorithm technology to construct the ship rolling angle from the acceleration measuring signals and t...


Jun 19, 2015Open    AccessArticle

A New Offer of Approach of Motivation Factors Measurement

Nargiz E. Samadova, Rustam B. Rustamov
The fact is that it is always attempted to develop suitable motivation factors satisfying company management needs in this very sensitive as well as vital aspects of development. Each of existing approaches at some point has been applied and tested as to its effects on people’s lives, jobs, and personal goals in life as well as in the work place. Honestly, it is very difficult to find out motivation factors, which can be used in wide areas of management process. There is no flexible manner of fa...


Feb 13, 2015Open    AccessArticle

Electrohydrodynamics Instability of Three Periodic Streaming Fluids through Porous Media

Sameh A. Alkharashi
In this work, the effect of transverse horizontal electric field on the stability of three layers of immiscible liquids is illustrated. The fluids are subjected to a uniform horizontal electric field. Analytical and numerical simulations of this system of linear evolution equations are performed. The solutions of the linearized equations of motion and the boundary conditions lead to deriving two simultaneous Mathieu equations of damping terms having complex coefficients. The effects of the strea...


Feb 06, 2015Open    AccessArticle

The Relation between the Pressure Gradient of General Relativity and Its Newtonian Counterpart with Respect to Certain Stellar Models

Rajat Roy
The non-uniqueness of the relation between the pressure gradients of general relativity and its Newtonian counterpart is demonstrated. This may lead to a non-unique relation between the two force laws.


Dec 25, 2014Open    AccessArticle

Slip Flow and Heat Transfer of Magnetic Fluids in Micro Porous Media Using a Lattice Boltzmann Method

Xi Chen, Licong Jin, Xinrong Zhang
In this paper, a Lattice Boltzmann method was used to simulate the flow of temperature-sensitive magnetic fluids in a micro porous cavity. According to Navier’s linear slip length model, slip boundary conditions were used on all the walls of the micro porous cavity. The effects of the horizontal slip length and the vertical slip length on the flow and heat transfer characteristics were investigated. The results showed that with the increase of the slip length, the velocities and their gradients ...


Oct 31, 2014Open    AccessArticle

Magnetohydrodynamic Flow of Viscous Fluid over a Non-Linearly Stretching Sheet

Yohannes Yirga, Daniel Tesfay
In this paper, the Magnetohydrodynamic (MHD) Flow of Viscous Fluid over a Nonlinear Stretching Sheet is investigated numerically. The partial differential equations governing the flow are reduced to a non linear ordinary differential equations by using similarity transformations. The resulting transformed equations are numerically solved by an explicit finite difference scheme known as the Keller Box Method. The velocity profiles are determined and the effects of the magnetic parameter and non l...


Sep 17, 2014Open    AccessArticle

Hydrodynamical Phenomena at Preparation of Earthquake

Igor Petrovich Dobrovolsky
Variations in level of fluid in wells caused by Earth tides and earthquakes are governed by two leading processes: deformation of medium and filtration. These processes are described by identical systems of equations and are united by the term “hydrodynamical phenomena”. The exact solution is obtained for the problem of level variations in wells due to Earth tides. The similar problem is solved for short-term precursors of a tectonic earthquake. Results are consistent with data of field observat...


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