In this paper, we present the study of momentum characteristics in a MHD viscous flow over a stretching sheet. First the partial differential equations of motion have been transformed to an ordinary differential equat...In this paper, we present the study of momentum characteristics in a MHD viscous flow over a stretching sheet. First the partial differential equations of motion have been transformed to an ordinary differential equation. The analytical method called Differential Transformation Method (DTM) powered by the Pade’ approximation is applied to solve the nonlinear equation derived from MHD viscous flow over a stretching sheet, the effect of parameters variation has been investigated for two numerical cases and finally the analytical results have been compared with numerical one in a numerical case. The obtained results approve its efficiencies and capabilities beside numerical solutions achieved from Runge Kutta method.展开更多
Magnetic nanofiuid hydrothermal analysis over a plate is studied that includes consideration of thermal radiation. The Runge-Kutta （RK4） method is utilized to get solution of ODEs which are obtained from similarity ...Magnetic nanofiuid hydrothermal analysis over a plate is studied that includes consideration of thermal radiation. The Runge-Kutta （RK4） method is utilized to get solution of ODEs which are obtained from similarity solution. In considering the impacts of Brownian motion, we applied Koo-Kleinstreuer-Li cor- relation to simulate the properties of CuO-water. The influence is discussed of important parameters such as the temperature index, magnetic, radiation, and velocity ratio parameters and volume fraction of nanoparticle on hydrothermal behavior. Results illustrate that the coefficient of skin friction enhances with enhancing magnetic parameter while reduces with enhancing velocity ratio parameter. Also the Nusselt number was found to directly depend on the velocity ratio and temperature index parameters but has an inverse dependence on the magnetic and radiation parameters.展开更多
This paper presents the application of a new method for obtaining new exact solutions of some well-known nonlinear partial differential equations.The Rational Hyperbolic method is used for handling the Zhiber-Shabat e...This paper presents the application of a new method for obtaining new exact solutions of some well-known nonlinear partial differential equations.The Rational Hyperbolic method is used for handling the Zhiber-Shabat equation and the related equations such as Liouville,Sinh-Gordon,Dodd-Bullough-Mikhailov and Tzitzeica-Dodd-Bullough equations.We show power of the Rational Hyperbolic method that is simple and effective for solving nonlinear partial differential equations.展开更多
In present study,the operational parameters for a two stroke gasoline engine such as delivery ratio,scavenging efficiency,trapping efficiency,etc.have been investigated experimentally when its fuel is blended with eth...In present study,the operational parameters for a two stroke gasoline engine such as delivery ratio,scavenging efficiency,trapping efficiency,etc.have been investigated experimentally when its fuel is blended with ethanol additives.Also the amounts of emitted pollutants(HC,CO,CO_(2)and NO_(X))from this engine are measured in various engine velocity and loads.In experiments,ethanol is combined with gasoline in different percentages of 5%,10%and 15%.The experiments have been done for 2500,3000,3500 and 4500 rpm.The results show that in most test cases,when alcoholic fuel is used,scavenging efficiency and delivery ratio increased due to rapid evaporation of ethanol,but fuel converging efficiency and brake specific fuel consumption(BSFC)decreased.The most outstanding result of using ethanol additive is significant reduction in pollutions emitted from engine and CO with 35%reduction has the most reduction percentage among other pollutants.展开更多
文摘In this paper, we present the study of momentum characteristics in a MHD viscous flow over a stretching sheet. First the partial differential equations of motion have been transformed to an ordinary differential equation. The analytical method called Differential Transformation Method (DTM) powered by the Pade’ approximation is applied to solve the nonlinear equation derived from MHD viscous flow over a stretching sheet, the effect of parameters variation has been investigated for two numerical cases and finally the analytical results have been compared with numerical one in a numerical case. The obtained results approve its efficiencies and capabilities beside numerical solutions achieved from Runge Kutta method.
文摘Magnetic nanofiuid hydrothermal analysis over a plate is studied that includes consideration of thermal radiation. The Runge-Kutta （RK4） method is utilized to get solution of ODEs which are obtained from similarity solution. In considering the impacts of Brownian motion, we applied Koo-Kleinstreuer-Li cor- relation to simulate the properties of CuO-water. The influence is discussed of important parameters such as the temperature index, magnetic, radiation, and velocity ratio parameters and volume fraction of nanoparticle on hydrothermal behavior. Results illustrate that the coefficient of skin friction enhances with enhancing magnetic parameter while reduces with enhancing velocity ratio parameter. Also the Nusselt number was found to directly depend on the velocity ratio and temperature index parameters but has an inverse dependence on the magnetic and radiation parameters.
文摘This paper presents the application of a new method for obtaining new exact solutions of some well-known nonlinear partial differential equations.The Rational Hyperbolic method is used for handling the Zhiber-Shabat equation and the related equations such as Liouville,Sinh-Gordon,Dodd-Bullough-Mikhailov and Tzitzeica-Dodd-Bullough equations.We show power of the Rational Hyperbolic method that is simple and effective for solving nonlinear partial differential equations.
文摘In present study,the operational parameters for a two stroke gasoline engine such as delivery ratio,scavenging efficiency,trapping efficiency,etc.have been investigated experimentally when its fuel is blended with ethanol additives.Also the amounts of emitted pollutants(HC,CO,CO_(2)and NO_(X))from this engine are measured in various engine velocity and loads.In experiments,ethanol is combined with gasoline in different percentages of 5%,10%and 15%.The experiments have been done for 2500,3000,3500 and 4500 rpm.The results show that in most test cases,when alcoholic fuel is used,scavenging efficiency and delivery ratio increased due to rapid evaporation of ethanol,but fuel converging efficiency and brake specific fuel consumption(BSFC)decreased.The most outstanding result of using ethanol additive is significant reduction in pollutions emitted from engine and CO with 35%reduction has the most reduction percentage among other pollutants.
