جستجوی مقالات مرتبط با کلیدواژه « تزریق » در نشریات گروه « مکانیک »

In this paper, the effect of non-uniform magnetic field on temperature and velocity profile for a boundary layer flow over a moving and horizontal flat plate by using of a self-similar method is studied. A variable and non-uniform magnetic field is considered and it is assumed that there is suction by the wall with a variable velocity.It is assumed that The velocity out of boundary layer is varying with x. For solving, governing partial differential equations by help of similarity parameter and similarity solution were changed into ordinary differential equations and then by using of shooting method and forth-order range-Kutta method, all equations are solved. At the end, the effect of dimensionless parameters on the velocity and temperature profiles, are given. It is revealed that by increasing the magnetic field parameter, the velocity inside the boundary layer decreases and the temperature increased since the fluid particles in the boundary layer are ionized.

Using natural gas as a clean fuel is raising. In many industrial combustion systems, like industrial furnace and boilers, a large portion of heat transfer is done by radiation and using natural gas in these industrial systems leads to decrease in radiation heat transfer that faces the Manufacturers with many problems. The addition of solid reactant particles into the flame is one of the attractive methods that are considered by many researchers to increase the radiation heat transfer in non-luminous flame such as hydrogen and natural gas flame. In this study, the effect of coal particles injection into the natural gas diffusion flame on flame structure, radiation heat transfer, temperature profile, and thermal efficiency has been considered. The results show that the injection of coal particles into the natural gas by increasing the solid soot particles in the flame structure, increases the reaction surface and flame luminosity and with increasing the radiation emissivity coefficient, increases the radiation heat transfer and thermal efficiency 43% and 21% respectively. Whereas change in flame temperature is very low and is 47˚C in its extreme limit.