Peristaltic Transport of Micropolar Fluid in a Tubes Under Influence of Magnetic Field and Rotation
In this paper, The peristaltic flow of micropolar fluid in a flexible tube with viscoelastic is studied under effect of magnetic field and rotation. The Runge-Kutta method is used to solve the governing equations of motion resulting from a perturbation technique for small values of amplitude ratio. The time mean axial velocity profiles are presented for the case of free pumping and analyzed to observe the influence of rotation and magnetic field for various values of radial r and wave numbe. The numerical results of the time mean velocity profile are discussed in detail for homogeneous fluid under effect of magnetic field and rotation for different cases by figures. The results indicate that the effect of rotation and magnetic field are very pronounced. Numerical results are given and illustrated graphically. Index Term-Peristaltic motion, micropolar fluid, magnetic field, rotation, Runge-Kutta method, velocity profiles.
Peristaltic flow of blood under effect of a magnetic field in a non-uniform channels
The effect of a magnetic field on peristaltic transport of blood in a non-uniform two-dimensional channels has been investigated under zero Reynolds number with long wavelength approximation. Blood is represented by a viscous, incompressible and electrically conducting couple-stress fluid (a fluid which its particles size are taken into account, a special case of a non-Newtonian fluid). It is found that the pressure rise decreases as the couple-stress fluid parameter @c increases (i.e. small size fluid particle) and increases as the Hartmann number M increases. So the pressure rise for a couple-stress fluid (as a blood model) is greater than that for a Newtonian fluid and is smaller for a magnetohydrodynamic fluid than for a fluid without an effect of a magnetic field. Finally, the maximum pressure rise (Q=0) increases as M increases and @c decreases, and the effect of the Hartmann number M is more obvious (for the same (@[email protected]?"L)"m"a"x".) as the couple-stress parameter @c increases (Newtonian fluid).
Chemical-Looping Combustion of Biomass in a 10 kWth Reactor with Iron Oxide As an Oxygen Carrier
Chemical-looping combustion of biomass was carried out in a 10 kWth reactor with iron oxide as an oxygen carrier. A total 30 h of test was achieved with the same batch of iron oxide oxygen carrier. The effect of the fuel reactor temperature on gas composition of the fuel reactor and the air reactor, the proportion of biomass carbon reacting in the fuel reactor, and the conversion of biomass carbon to CO2 in the fuel reactor was experimentally investigated. The results showed that the CO production from biomass gasification with CO2 was more temperature dependent than the CO oxidation with iron oxide in the fuel reactor, and an increase in the fuel reactor temperature produced a higher increase for the CO production from biomass gasification than for the oxidation of CO by iron oxide. Although the conversion of biomass carbon to CO2 in the fuel reactor decreased with the increase of the fuel reactor temperature, there was a substantial increase in the proportion of biomass carbon reacting in the fuel react...