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MHD Flow around Circular Cylinder UnderControl through three Different magnetic Permeability Status

Through the current work, the flow around an insulating cylinder of various magnetic permeability, submitted to a flow of an incompressible electrically conducting fluid has been investigated. The homogeneous fluid flow and the homogeneous applied magnetic field are aligned at infinity. When the cylinder has the similar magnetic permeability as the fluid, the applied field is not influenced by the cylinder. However, when the cylinder has a different magnetic permeability than that of the fluid, the applied field is agitated by the cylinder and then the flow structures will become different from those of the previous case. Consequently, two cases can be distinguished following the last state whereas the cylinder magnetic permeability may have less or greater value than the fluid one’s. The best agreed results that have been obtained following the comparison to the literature magnetic field behaviors were selected .The event has been occurred, where the convergence and divergence of the magnetic stream lines were realized to the previous both cases of magnetic permeability situations, respectively. In fact, an important influence of magnetic field on the fluid has been occurred. Consequently, it can be concluded that the fluid has significant influences on the cylinder structure, through the impact of the fluid structure phenomenon, the shedding vortex process and its suppression. Accordingly, good results of drag aerodynamic coefficient evolution were obtained at the fixed value of the Reynolds number Re=550, for different Stuart numbers, greater than and lessen than a critical value adopting at N=0.8.

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Effects of Compressor Blade Profile Change on Thermo-economic Performance of Gas Turbine

This study investigates the effects of variations in compressor blade profile on the thermo-economic performance of gas turbines. The compressor's thermo-economic performance was determined using data obtained from the power plant. The method used for the analysis was simplifying the compressor, combustion chamber, and turbine into control volumes. Each flow was analyzed based on exergy, economic, and exergy cost principles. As 1 was increased, rotor blade deflection and diffusion were reduced while outlet velocity, stage efficiency, and pressure ratio increased. Pressure ratio increased by up to 20 percent when 1 increased by 10 and decreased by 7.5 percent when  2 increased by 10 . Equipment cost, annualized cost and total capital investment, operation, and maintenance cost increased by 27.68 percent, 27.31 percent, and 22.86 percent as 1 increased by 10 while equipment cost, annualized cost and total capital investment, operation, and maintenance cost increased by 12.44 percent, 12.12 percent, and 12.45 percent as  2 decreased by as much as 10 . Cost of exergy destruction, average unit cost of exergy input and average unit cost of exergy output increase by 2.64 percent, 2.62 percent, and 4.65 percent as 1 increase by 10 . It was recommended that the gas turbine filtration system be improved to suit the harsh environmental conditions of the area to reduce the amount of foulants on compressor blades. This will increase compressor life expectancy and efficiency, save operating and maintenance costs, and increase the reliability of the gas turbine to deliver maximum power. Furthermore, the research findings could serve as a useful reference for designers in selecting a reasonable compressor blade angle.

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Design and Simulation of Automatic Street Lighting System using Solar

The project is designed for Solar powered pedestal street lights that uses solar power from PV cells. For controlling the charging of the battery a charge controller is been used, and an LDR is used to sense the light on day as well as the evening time. The intensity of street lights is required to be kept high during the peak hours. The street lights are switched on using a sensing device LDR LED lights at the dusk and then switched off automatically when the timer set in the timer relay module stops. Due to which there is low energy consumption and the system works long life so that they can fast replace conventional lights world over. White light emitting diode (LED) replaces the HID lamps due to which the light gets saved and the system works without any problem. For energy saving of solar based system, also a charge controller is used to protect the battery from over charging, overloading and deep dischargeing protection. A light sensing device LDR (Light Dependent Resistance) is used, whose resistance reduces drastically for sensing purposes. In the measuring circuit the light intensity is monitored using an Light Dependent Resistance sensor and an signal from ldr sensor is send to the relay timer module and the times gets started and, after the time finishes the relay attached to the relay timer module gets open and the street lights stops. The design for this proposed project is modeled in PROTEUS 8 and acceptable results came at the end.

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Conventional regeneration of spent activated carbon from brewer’s spent grain

This work studied conventional regeneration of saturated activated carbon using muffle furnace. The activated carbon was prepared from brewer’s spent grain using carbonization and chemical activation with potassium hydroxide. It was saturated with methylene blue dye and regenerated using muffle furnace. Effect of 30% hydrogen peroxide (H202 ) as an oxidant in the regeneration process was studied. Adsorption – regeneration process was studied for six cycles. Regeneration condition was optimized using central composite design (CCD). Effect of regeneration temperature and time on the adsorptive capacity of regenerated carbon was studied for one cycle. Adsorptive capacity and regeneration efficiency were found to decrease with increase in the number of cycles. 30% H202 had a tremendous effect on the adsorptive capacity of the regenerated carbon. The adsorptive capacity increased as the temperature grew from 200°C to 500°C, but dropped after being raised to 6,000°C. Adsorptive capacity increased from 10 minutes to 30 minutes, but declined to 50 minutes. The Quadratic model was used to regenerate a long network of electronics devices. In this experiment, the parameters were exactly what were required for optimal adsorption: temperature of 537.76 degrees Celsius, time of 29.34 minutes, and an initial dye concentration of 100mg/L with estimated adsorptive capacity of 54.2827mg/L. This was an extremely small mistake of 0.02 percent following validation.

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